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****** Page 1 ****** 7600 STEREO POWER AMPLIFIER OWNER’S MANUAL

****** Page 2 ****** Operating and Servicing Instructions for the Electro-Voice Table of Contents 7600 Power Amplifier 1 ELECTRICAL 1.1 120 V ac, 50/60 Hz Power Connections 1.2 230/240 V ac, 50/60 Hz Power 2 INSTALLATION 2.1 Rack Mounting 2.2 Ventilation 3 SIGNAL CONNECTIONS 3.1 Input Connections 3.2 Line Output Connections 3.3 Output Connections 3.4 Output Cable Selection Connections . . 3.4.1 Calculating Power I ,osses with 8 ohm Loads 3.42 Calculating Power Losses with 4 ohm Loads 3.5 Damping Factor 3.5.1 Calculating the Maximum Length of Cable for a Specified Damping Factor 3.6 Speaker Protection Fuse Selection 3.7 Compression Driver Protection Capacitors 4 OCTAL ACCESSORY SOCKETS 5 PROTECTION SYSTEMS 5.1 Load Protection Circuitry 5.2 Amplifier Protection 5.3 Protect Indicator 6 OPERATION Circuitry 6.1 Dual Mode of Operation 6.2 Bridge Mode of Operation 7 8 9 IN CASE OF PROBLEMS SPECIFICATIONS SERVICE INFORMATION 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 Trimpot Adjustments Equipment Needed Adjusting R39, the LF Cancel Trimpot Adjusting R26, the BIAS Trimpot Adjusting R23 and R24, the Negative and Positive Current Limit Trimpots Checking the Short Circuit Current Ordering Replacement Parts Factory Service Technical Assistance Electro-Voice • a Mark IV Company 5 6 13 13 13 13 13 15 15 15 15

****** Page 3 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier 1 ELECTRICAL Two amplifier models are available. One model has a 50/60 Hz power transformer with two 120 V ac primary windings. These windings may be wired in parallel or series for operation at either 120 V ac or 220/240 V ac. The 0t- her amplifier model is for export into countries where the ac line voltage is 100 volts, 50/60 Hz. The next two sections refer to the first model with the dual 120 V ac pri- mary windings. 120 V ac, 50/60 Hz 1.1 Power Connections The amplifier is provided with the primary of the power tra- nsformer strapped for 120 V ac op- eration from the factory. Refer to Figure 2a for the wiring details. WARNING: Verify that the power transformer’s primary circuit con- figuration is correct for the in- tended ac line voltage BEFORE applying power to the amplifier. 220/240 V ac, 50/60 Hz 1.2 Power Connections The power transformer has two 120 volt primary windings which can be connected in parallel for 120 V ac line voltages, or in series to meet 220/240 V ac requi- rements. Use the following proce- dures to re-strap the primary of the power transformer for 220/240 V ac applications. REMOVE 3 SCREWS (BOTH SIDES) Figure 1 Top Cover Removal NOTE: THIS SCREW IS LONGER THAN THE OTHER THO (BOTH REMOVE 3 SCREWS REMOVE 2 MIDDLE SCREWS (FRONT PA}EL) 1. 2. Make sure the amplifier is not connected to any er source. Remove and save the ele- ven screws securing the top cover. There are three screws on each side and three along the top-rear edge of the chassis. In addition, you must remove the two innermost screws inset into the top bumper strip. Refer to Figure 1 for the exact screw locations. 3. 4. 5. 2 2.1 Locate the barrier strip mounted on the top-rear edge of the power trans- former. Referring to Figure 2b, reconnect the leads as shown. Install the top cover with the eleven screws previous- ly removed. Two screws are longer than the others removed from the sides and rear. These longer sc- rews install into the rear- most position on each side of the chassis. Install an 8 amp fuse, Littelfuse Type 3AB 8A/250V slo-blo@ 326- series ceramic body or equivalent. INSTALLATION Rack Mounting Electro-Voice • a Mark IV Company The amplifier may be installed in a standard 19 inch equipment rack. It requires 51/4 inches of vertical rack space and secures to the rack cabinet with the four rack mount screws and cup washers provided in the hard- ware kit. 2.2 Ventilation The amplifier must be adequately ventilated to avoid excessive temperature rise. It should not be used in areas where the ambient temperature exceeds 60 oc (140 OF). To determine the ambient air temperature, operate the system in the rack until the temperature stabilizes. Measure the ambient air with a bulb-type thermometer held at the bottom of the uppermost amplifier. Do not let the thermometer touch the metal chassis because the chassis will be hotter than the ambient air. If the air temperature exceeds 60 oc (140 1

****** Page 4 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier b. M-IITE FAN WIFE (connected underneath plate) Inlnlalnlnl WHIT YELLOW BLACK BROKN (120 V) a. 120 V ac Primary Wiring M-IITE FAN WHITE YEI-LOK BUCK BROWN (240 v) 220/240 V ac Primary Wiring Plate 220/240 V NOTE The 300 fan dropping resistor be replaced with a 600 ohn resistor to nini- •ize fan noise. Figure 2 Primary Wiring Configuration for 120 V ac and 220/240 V ac OF), the equipment should be spac- ed at least 1.75 inches apart or a blower installed to provide suffi- cient air movement within the cab inet. WARNING: Do not operate the amplifier within a completely closed unventilated housing. 3.2 Line Output Connect- ions The XLR and phone 3 3.1 SIGNAL CONNECT- IONS Input Connections Balanced input connections may be made to either the 1/4H phone (TRS) or the female XLR connectors. For single-ended in- puts, strap the low (—) input to ground (pin 3 on XLR or Ring on 1/4″ phone). Otherwise, the electron- ically-balanced input stage will see 6 dB less input signal level than with a balanced input. Refer to Fig- ure 3 for typical input connections. 2 connectors are wired in parallel. Pin 2 of the XLR is the Tip of the 1/4″ phone connector, and pin 3 is the Ring. Since the input impedance of the electronically- balanced input stage is high (15 kohms), there is minimal loading on the signal source. When the input connections are made to one connector, the other may be used as an auxiliary line output to feed other high input impedance equipment. Refer to Figure 3 for applications. 3.3 Output Connections Output connections can made to either the four terminal barrier strip OR the Neutrik connectors. Re- fer to Figure 4 for typical output connections. Electro-Voice • a Mark IV Company Neutrik Speakon connectors have been incorporated into the 7600 be- cause they offer a number of attrac- tive benefits: the connector is lock- ing and airtight; it’s very strong (you can actually stand on it with- out damage); it will accommodate wire gauges up to 10 AWG; termin- ations are solderless making field servicing easy; and they meet the test safety requirements of UL, CSA, and IEC 65 (“test finger” pro- cedures). The 7600 amplifier has three Speak- on output connectors: one for the IÆft output, one for the Right, and one for Monoe Although this goes against the original Neutrik design of having a 4-pole connector to al- low bi-amping in a single connect- or, it gives you the larger benefit of having speaker cables that are usa- ble for left, right, or mono appli- cations. The three Speakon output connect- ors are wired identically: the “+” signal is connected to the “1+” pin on the connector, and the c’ ” sig- nal is connected to the pin. The connectors are clearly labeled on the back of the amplifier for Channel 1, Channel 2, and Mono. WARNING: Check your applicati- ons carefully. There are speaker systems that have Speakon connect- ors on them (including some EVsys- tems) that are not wired to the convention above. This means that a speaker cable equipped with Neu- trik connector at both ends may not properly connect the amplifier to the speaker. 3.4 Output Cable Selection Speaker wire size plays an important part in quality sound sys- tems. Small wire gauges can waste power and reduce the damping fac- tor at the speaker terminals. This can add coloration and muddiness to the sound. To help offset this problem, Table I has been assemb- led to enable you to calculate the power losses in the speaker cable.

****** Page 5 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier SOURCE BALANCED SOURCE BALANCED SOURCE H/600 OHM TERMINATION UNBALANCED SOURCE UNBALANCED SOURCE AMPLIFIER’S INPUTS BAmIER STRIP NC NC 2 3 1 XLR 2 3 2 3 XLR 2 3 1 STRIP SINGLE-ENDED AUX OUTPUT HOT HOT COM NC STRIP BAÆi1Efi STRIP AUX OUTPUTS (USER OPTIONS) BAL •ili OUTPUT NC RESISTOR 600 KEEP COH CABLE RUNS UNDER OR 2 m HOT HOT COM Figure 3 Typical Input Connections NC LOUDSPEAKER LOADS AMPLIFIER’S OUTPUTS SPEAKER OUTPUTS CHI C ; CH2C+- DUAL MODE SPEAKER OUTPUTS CH2C-+ DUAL MODE SPEAKER OUTPUTS CHI. BRIDGE MODE PMTECTIN NOTECTIN CAP. n.PÆSSION STEREO/DUAL FLU RANGE OPERATION BI-ÅUP SYSTEM HIGH POKER FU-L RANGE/ SIMOOFER Figure 4 Typical Output Connections To calculate the total 3.4.1 Calculating Power Losses with 8 ohm power loss in the speaker cable, multiply the power loss per foot (or Loads Electro-Voice a Mark IV Company meter) of the 2-wire cable selected from Table I by the length of the cable in feet (or meters). For ex- ample, suppose an installer uses 160 feet of 10 GA 2-wire cable with an 8 Q speaker system. The total power loss in the cable is: Total Power Loss in cable 0.1013 watts/foot X 160 feet = 16.2 watts Does this mean that whenever the amplifier produces 400 watts of output power, 383.8 watts (400 watts minus 16.2 watts) will be delivered to the 8 ohm load? NO! The actual load impedance is 8 ohms plus the resistance of the cable (0.00204 ohms/foot times 160 feet) for a total load impedance of 8.3264 ohms. At the 8 Q rated out- put power, the output voltage is 56.57 V rms. Therefore, the amp- lifier produces 384.3 watts with this load instead of 400 watts. This was calculated by squaring the volt- age and dividing by the load impedance (56.572 divided by 8.3264 ohms). As a result, the actual power delivered to the load is 368.1 watts (384.3 watts minus 16.2 watts). Had 18 GA wire been used in the above example, the loss in the cable would have been 100.8 watts. This example illustrates the importance of using the proFer ‘Fire size. 3.4.2 Calculating Power Losses with 4 ohm Loads To calculate the losses when using a 4 ohm srpaker sys- tem, multiply the loss at 8 ohms by 3. In the above example, the 10 GA wire would consume 48.6 watts of power while the 18 GA wire would waste 302.5 watts – more than half of the amplifier’s 4 ohm power rat- ing. 3.5 Damping Factor The higher the damping factor rating of an amplifier, the 3

****** Page 6 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier POKER AMPLIFIER STEP-IF TRANSFORÆR BRIDGE INPUT HOOE OF OPERATION SHORT CABLE RUNS 70. 100. 140. OR 210 VOLTS 70, 100. OR 210 VOLTS LONG CABLE RIN (SMALL GUAGE HIRE) LOIDSPEAKER STEP-OOKN TRANSFORÆR Figure 5 High-voltage Distribution System load because of the resistance of the cable (and other factors such as the contact resistance of an output relay or the resistance of an output fuse). The damping factor at the load should be 30 for general pag- ing systems and 50 for high fidelity music systems. Economics usually dictate, however, that these num- bers are cut-in-half. The resulting damping factor at the load should be based on experience and cus- tomer satisfaction. Once a mini- mum damping factor is determined for a particular of installation, the following equation can cal- culate the maximum length of 2- wire cable which can be used to achieve the rninimum damping factor specified at the load: Max. Length of 2-wire cable in feet ZL DCWft where ZL is the load impedance to connect to the amplifier; Zo is the amplifier’s output impedance (0.032 ohms for the 7600); DF is the minimum damping factor 2at the load; and DCR/ft is the DC resistance of the 2-uire cable per foot from Table I. greater the ability of the amplifier to control unwanted speaker cone movements. Y’Q1en a signal drives a woofer, current flowing through the voice coil creates a magnetic field. This field interacts with the permanent magnetic field in the gap and forces the combination cone and voice coil assembly to move outward. When the signal is removed, the assembly moves in- ward but its momentum causes it to overshoot its resting point. This overshoot will dampen itself out eventually but the unwanted move- ments can add considerable dis- tortion products to the sound. In the process of moving inward through the magnetic field, the voice coil assembly generates a cur- rent of opposite polarity to the original signal. This current in- duces a voltage or “back EMF” which travels through the speaker wire to the amplifier’s output. The lower the amplifier’s output impe- dance, the faster the overshoot of the voice coil will dampen out. The output impedance of an amplifier 4 can be calculated by dividing the rated output impedance, typically 8 ohms, by the damping factor. The 7600 has a damping factor rating of 250 which corresponds to an output impedance of 0.032 ohms. 3.5.1 Calculating the Max- imum Length of Cable for a Specified Damping Factor Specification at the Load The damping factor rating is typically never realized at the Table 1 7600 Power Losses in 2-wire Speaker Cable AWG (GA) 6 8 10 12 14 16 18 20 22 Dcwn OM121 0M204 o.CX)819 0.02070 0.03292 Power (watts/ft) 0.0402 O.Cb03 o. 1013 0.2542 0.4011 o.CA)3 0.9834 1.5185 Cable Cross- Sectional area (mm2) 13.30 8.36 5.26 3.31 2.08 1.31 0.82 032 033 1)CRtmeter (Wrn) 0.03264 0.03421 0.01691 0.02685 0.04289 o.(k3764 o.1CR58 Power (watts/m) 0.1314 0.2082 0.3288 0.5175 0.8108 1.2567 1.9319 28752 4.1497 Electro-Voice • a Mark IV Company

****** Page 7 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier The same equation can be used to calculate the maximum cable len- gth in meters by substituting the DCR meter value from Table I. Let’s use the equation. Suppose ZL equals 8 ohms, Zo = 0.032 ohms, and the minimum damping factor at the load is 25. In addition, 18 GA cable is preferred. Then, the maximum length of 18 GA cable which enn be used to achieve a damping factor of 25 at the load is: (0.032) missible damping factor at the load. Suppose a 210 volt system were used at a 1200 watt pwer level to drive an 8 ohm load with a mini- mum damping factor of 25. Using the same 18 GA cable as before, the maximum length can now be 102 feet. Power companies use this technique to transfer large amounts of power over great dis• tances. Speaker Protection 3.6 Fuse Selection Sometimes it may be de- sirable to use in-line fuses (fuses in series with the output) to pro- tect loudspeaker systems (or the amplifier). It is difficult, however, to determine the proper fuse value with the correct time lag and overload characteristics to match the limitations of a speaker sys- tem. The values shown in Table II should serve only as a guide. To use, determine the power rating and load value. Then, select a standard value fuse of the next smaller value to the one listed in the table. The values are calculated for fast- blow fuses which carry 135% of their current rating for an hour but will blow within 1 second at 200%. Other fuse values may be calculated for different levels from the following equation: Fuse value = (Pout x ZIJ) % amps ZL x 1.35 Table II Calculated Output Fuse where Pout is the output power rating of the amplifier; and ZL is the load impedance. Use 32 volt fuses if possible; they typically have the lowest internal resistance which will help minimize deterioration of the damping factor at the load. Refer to the example in Figure 4. 3.7 25 = 22.1 feet Compression Driver Protection Capacitors Compression drivers, used 0.01302 Q/ft Sometimes it may be necessary to locate the speaker 100 feet or more away from the amplifier. In this situation, a much larger gauge cable is required. However, this may not be practical or economical. The size of the 2-wire cable can be greatly reduced by stepping up the output voltage of the amplifier to 70, 100, 140, or 210 volt, using an output transformer, then stepping down the voltage at the load. Such a system is shown in Figure 5. The maximum length of 2-wire ca- ble in this situation can be ap- proximated from the following equation: Max. Length of 2-wire cable in feet 1 for mid to high frequency sound reproduction, are much more sus- ceptible to damage from low frequencies than large cone loudspeakers. Even though an electronic crossover may be employed, problems may arise in the cables between the crossover and the amplifier, or from misadjustment of the crossover. Either of these situations could apply low frequency signals or hum to the driver and cause dam- age. To prevent a ptential mis- hap, Electro-Voice recommends , using a capacitor between the amplifier and the compression driver to suppress low frequencies and possible DC. Refer to the example in Figure 4. Table III Compression Driver Pro- tection Capacitors where V is the ZL stepped-up Crossover Frequency 1250 Hz 3150 Driver 80 50 40 20 12 160 Driver 40 25 20 16 10 voltage of the system; Pout is the rated output of the amplifier; Zo is the output impeda- nce of the amplifier (0.032 ohms for the 76(X)); ZL is the load impedance; DCR/ft is the DC resis- tance of the 2-wire cable per foot from Table I; and DF is the minimum per- Values Power (watts) 150 Load 3.70 4.54 5.24 6.42 7.41 9.07 80 Load 2.62 3.21 3.70 4.54 5.24 6.42 160 1.85 2.27 2.62 3.21 3.70 4.54 Electro-Voice a Mark IV Company In a value, one must be careful not to interfere with the crossover frequency. As a general rule, select a capacitor whose 5

****** Page 8 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier break frequency, with respect to the load, is 3 dB down at approx- imately 1/2 of the high pass corner frequency. Mylar capacitors with at least a 100 volt ac rating are recommend- ed. Table III shows the recomm- ended capacitor values for use with 8 and 16 ohm drivers at popular crossover frequencies. 4 OCTAL ACCESSORY SOCKETS Two octal sockets permit a A unique current-limiting circuit was designed specifically for the amplifier. It features a variable current limit which is a function of the output signal volt- age. As a result, the amplifier can deliver the rated currents into rat- ed loads but substantially limits the current into low impedance or shorted loads (shorted output ter- minals). Once the short is re- moved, however, the amplifier will resume normal operation. A dual speed fan is also incorp- orated to provide efficient cooling under the most demanding condit- ions. When the heatsink tempera- ture at the fin tips reaches appro- ximately 88 oc (190 OF), the fan automatically switches to high speed operation. As the tempera- ture cools to approximately 78 oc (1720F), low speed operation is once again resumed. The heatsink is also thermally equalized to prevent the output devices nearest the fan from oper- ating at a cooler temperature than the devices at the opposite end. This minimizes the thermal grad- ient across the heatsink and for- ces the devices to operate at more nearly the same temperature. This equalizes the lifetimes and relia- bility characteristics of the output devices so that no one device be- comes the weak link in the chain. Should the heatsink temperature of a channel remain excessively high, the affected channel will shut down automatically. When the output devices cool to a safe operating temperature, the chan- nel will automatically resume nor- mal 5.3 Protect Indicator The “PROTECT” LED does not turn-on abruptly as ot- hers may do; its intensity is all- owed to vary. As a result, its de- gree of brightness serves as a rela- tive indicator of the severity of Electro-Voice • a Mark IV Company the current operating conditions e.g., the brighter the LED, the greater the stress on the chann- el(s). This provides a visual notif- ication well in advance of any im- pending shutdown. Although the channel may still operate With the LED apparently at full brightness, a total shut- down will occur within a few sec- onds unless the operating condit- ions improve. If a shutdown does txcur, the channel will resume normal operation as soon as its devices have cooled to an accept- able temperature. variety of plug-in accessories to be used with the amplifier. Normally, one “U” jumper is inserted bet- ween octal socket pins 8 and 1, and another between pins 7 and 6. These jumpers must remain in place for the amplifier to operate when not using any accessory mod- ules. To use with an accessory module, remove (and save) the jumpers and install the module making sure the key on its center post aligns with the groove in the female socket. For operation, refer to the instructions provided with the module. *hematically, the module will be inserted between the input connector nnd the bal- anced input stage. Electronic modules are powered from a bipolar 15 volt supply in the amplifier. The supply is cap- able of supplying up to 25 ma DC of current. Currents in excess of 25 ma DC may prevent the ampli- fier from disengaging from its built-in protection mechanisms. 6 6.1 OPERATION Dual Mode of Opera- tion In the dual mode of oper- ation, the channels may be opera- ted independently. After install- ation and hookup, verify that the mode switch, located on the rear panel, is in the “DUAL” position and rotate the level controls fully counterclockwise (full attenuat- ion). Input a 0 dBu (0.775 V rms) nominal signal level and apply Slowly increase the level controls until the desired output power is obtained. If either “CLIP” LED illuminates, reduce the output with the channel level control or reduce the input signal level at its source. WARNING: Never attempt to con- nect the outputs of the two chan- nels in parallel. 5 5.1 ently PROTECTION SYS- TEMS Load Protection Cir- cuitry Each channel independ- protects its load from 6.2 Bridge Mode of Oper- ation After installation and startup/shutdown transients, DC, and large subsonic signals. 5.2 Amplifier Protection Circuitry 6 hookup, verify that the mode swi- tch, located on the rear panel, is in the “BRIDGE” psition. Rotate both levels controls fully counter- clockwise (full attenuation). Input a 0 dBu (0.775 V rms) nominal si- gnal level into channel 1 only and apply F)wer. Slowly increase the level control ofchannel 1 until the

****** Page 9 ****** Operating and Servicing Instructions Tor the Electro-Voice 7600 Power Amplifier desired output power is obtained. If either “CLIP” LED illuminates, reduce the output level with the level controlor reduce the input signal level at its source. CAUTION: Be sure that no input connections are made to channel 2 and that its level control is fully counterclockwise (OFF). WARNING: The bridged output mode provides a true balanced-to- ground output. Do not use any test equipment to test or evaluate this amplifier which does not have floating grounds. 7 items: 1. 2. 3. 4. 5. 6. 7. 8. In Case of Problems Please check the following Verify that the amplifier is properly connected to an ac power source and that the source is active. Verify that the input con- nections are properly made. Refer to Figure 3. Verify that the output co- nnections are properly made. Refer to Figure 4. Check the input and out- put cables for proper wiring and continuity. Check the signal source and the load. Insure that the two jump- ers for each octal socket are properly installed (if not using optional plug-in modules). Insure that any accessory modules installed do not draw more than 25 ma DC of current. Check that the mode swi- tch is in the desired posi- tion. NOTICE: Repairs performed by other than authorized warranty stations (Dealers) or qualified per- sonnel shall void the warranty per- iod of this unit. To avoid 10$$ of warranty, see your nearest Electro- Voice authorized dealer, or call Electro-Voice CustomerService dir- ectly at (405) 324-5311, FAX (405) 324-8981, or write: Electro-Voice Customer Service(Repair 10500 W. Reno Oklahoma City, 0K 78128 U.S.A Electro-Voice Customer Service/Repair 600 Cecil Street Buchanan, MI 49107 U.S.A Tel: (616) 695-6831 FAX: (616) 695-1304 Electro-Voice Customer Service/Repair 8324 Doe Avenue Visalia, CA 93219 U.SA Tel: (209) 651-7777 FAX: (209) 651-0164 Electro-Voice • a Mark IV Company

****** Page 10 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier 8 SPECIFICATIONS Conditions: 1. O dBu = 0.775 volts rms. 2. Dual mode ratings are for each channel. 3. Both channels operating at rated output unless noted. 4. 120 volt ac line input voltage maintained for all tests unless noted. Continuous Rated Output Power: (20 Hz – 20 kHz at less than 0.1% THD) Dual mode, 4 0 or 8 Q: 36 dB Bridge mode, 8 or 16 Q: 42 dB Input Sensitivity for Rated Output Power: Dual mode, 4 Q: Bridge mode, 8 Q: Dual mode, 8 n: Bridge mode, 16 n: 600 watts/ch 1200 watts 400 watts/ch 800 watts Continuous Rated Output Power to Subwoofer: (20 Hz – 1 kHz at less than 0.1% THD) Dual mode, 4 Q: Bridge mode, 8 Q: Dual mode, 8 Q: Bridge mode, 16 Q: 650 watts/ch 1300 watts 420 watts/ch 840 watts Maximum Midband Output Power: (Ret 1 kHz, ±0.25 dB) Dual mode, 4 Q: Bridge mode, 8 Q: Dual mode, 8 Q: Bridge mode, 16 Q: Maximum Input Level: (Ref. 1 kHz) Input Impedance: (Ref. 1 kHz) Balanced: Unbalanced: Polarity: Phase Response: (Any mode) 20 Hz: 20 kHz: +0.2 dBu (0.79 V rms) +0.2 dBu (0.79 V rms) +1.4 dBu (0.91 V rms) +1.4 dBu (0.91 V rms) +20 dBu (7.75 V rms) 15 kn 15 Positive-going signal applied to pin 2 of XLR or (+) of barrier strip produces positive-going signal at (+) output terminal. 700 watts/ch > 1400 watts > 425 watts/ch > 850 watts @108 volts ac (10% sag)) >575 watwch > 1150 watts > 350 watts/ch > 700 watts @100 volts ac (17% sag)) > 500 watts/ch > 1000 watts > 300 watts/ch > 600 watts (Any mode, 30 kHz measurement bandwidth) Headroom (Before clip): 20.25 dB (Ref. 1 kHz, 1% THD, any mode) Frequency Response: 10 Hz – 90 kHz (Ref. 1 kHz, 1 watt output, +0/—3 dB) Power Bandwidth: 20 Hz – 20 kHz (Ref. 1 kHz, +0/—1 dBr where 0 dBr = rated IMD (SMPTE 4:1): (Any TIM (DIM 100): (Any mode) Rise Time: (Any rncHe, 10% to 90%) Slew Rate: Dual mode, 4 or 8 Q: Bridge mode, 8 or 16 n: Damping Factor: (Dual 8 Q) 20 Hz – 1 kHz: 20 kHz: Crosstalk: (Typ. 30 V/psec >60 V/psec >250 dBr output B)wer in any mode) Voltage Gain: (Ref. 1 kHz) 8 (Ref. 1 kHz, 0 dBr = rated output pwer into 8 ohms, single channel operating) Noise: Electro-Voice • a Mark IV Company > 100 dB

****** Page 11 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier (Below rated output power, A-weighting filter, 8 Q dual mode, 50/60 IIZ ac line frequency) Amplifier Protection: Load Protection: Cooling: Heatsink: Fan: Output Topologt: Output %rpe: Dual mode: Bridge mode: Output Devices: Total number: Pdmax rating: Vceo: Ic: rljmax: Controls and Switches: Front: Shorted output term- inals, Over- temperature,RF interference Startup/shutdown transients, DC faults, Subsonic signals Thermally equalized 3/16 in aluminum black anodized heatsink, 1 per channel Thermostatically con- trolled dual speed fan. Approximately 55 CFM at low speed and 105 CFM at high speed. Ball bearing fan has mini- mum life rating of 50,000 hours at 25 oc ambient temperature True complementary symmetry with grounded collectors (no mica insulators means better heat transfer) Unbalanced, each channel Balanced 32 devices 250 watts 250 volts DC 16 amps DC 200 oc Mode switch Two input level controls, Power switch Output: Power: Fuse Type: Power Req uirements: Operating ac Voltage Range; Power Consumption/ Heat Produced: XLR (x 2), Octal accessory socket (x 2), powered with ± 15 volts DC at 25 ma. 4 terminal barrier strip 3- Neutrik Speakon@ connectors 4 ft (1.22 m), 3-wire, 14 GA power cord with NEMA 5-15 plug Littelfuse Type 3AB 10 N250 V Slo-B10@ 326- series ceramic cartridge body, or equivalent 120 V ac, 50/60 1800 watts (config- urable to 220/240 V ac). 100 V ac, 50/60 Hz model available. Operates from line voltages as low as 90 volts (at reduced output power) assuming a 120 V ac nominal line. (Both channels operating in dual mode with 1 kHz sinewave input signal at stated output pwer into 4 0 loads) idle: 118th max midband power: 1/3rd max midband pwer: Rated output Max midband 100 kBTIJ/h 1,440 watts/4.276 kBTU/h 1,800 watts/4e465 kBTU/h 2,520 watts/4.488 kBTU/h 2,700 watW4.216 kBTU/h Front Panel Indicators: Power LED, Clip LED Operating Temperature Range: Up to 60 oc (140 OF) ambient Connections: Input: (x 2), Protect LED (x 2) 1/4″ phone (x 2), Female Electro-Voice a Mark IV Company 9

****** Page 12 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier Dimensions (Rear of rack ears to max depth): Shipping Weight: Net Weight: Color: Enclosure: Standard Accessories: Optional Accessories: 5.25 in II x 19 in W x 15.75 in D (13.3 cm H x 48.3 cm W x 40.1 cm D) 62 lbs (28.1 kg) 52 lbs (23.6 kg) Black Rack mount chassis, 16 GA steel, 3/16 in 5052 aluminum alloy front panel 4 – “U” jumper plugs for octal sockets (2 per socket, installed) 1 – Operating Instruct- ions and Service Man- ual APX 24 dB/oct Link- witz-Riley Crossover APX-2 24 dB/oct Link- Vitz-Riley Crossover with External High Frequency Output APX-200 Equalizer module for S200 and FR200 speakers Electro-Voice continually strives to improve products and performance. Therefore, the specifi- cations are subject to change without notice. Slo-Blo@ is a registered trademark of Littelfuse, Inc. Speakon@ is a registered trademark of Neutrik USA, Inc. 10 Electro-Voice • a Mark IV Company

****** Page 13 ****** Operating and Servicing Instructions Tor the Electro-Voice 7600 Power Amplifier ELECTRO-VOICE UNIFORM LIMITED WARRANTY STATEMENT Electro-Voice are guaranteed against malfunction due to defects in materials or workmanship for a specified period, as noted in the individual product-line statement(s) below, or in the individual product data sheet or owner’s manual, beginning with the date of original purchase. If such malfunction during the specified period, the product will be repaired or replaced (at our option) without charge. The product will be returned to the customer prepaid. Exclusions and Limitations: The Limited Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items described in the individual product-line statement(s) below, or in the individual product data sheet or owner’s manual; (c) malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner’s manual; (d) malfunction resulting from misuse or abuse of the product; or (e) malfunction occurring at any time after repairs have been made to the product by anyone other than Electro-Voice or any of its authorized service representatives. Obtaining Warranty Service: To obtain warranty service, a customer must deliver the product, prepaid, to Electro-Voice or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice. A list of authorized service representatives is available from Electro-Voice at 600 Cecil Street, Buchanan, MI 49107 (616/695-6831) and/or Electro-Voice West at 8234 Avenue, Visalia, CA 93291 (209/651-7777). Incidental and Consequential Damages Excluded: Product repair or replacement and return to the customer are only remedies provided to the customer. Electro-Voice shall not be liable for any incidental or consequential damages including, without limitation, injury to or property or loss of use. Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you. Other Rights: ‘NIis warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Electro-Voice Electronics are guaranteed against malfunction due to defects in materials or workmanship for a period of three (3) years from the date of original purchase. Additional details are included in the Uniform Limited Warranty statement. Electro-Voice • a Mark IV Company 11

****** Page 14 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier 7600 Power Amplifier SERVICE INSTRUCTIONS * * * CAUTION * NO USER SERVICEABLE PARTS INSIDE. EXTREMELY HAZARDOUS VOLTAGES AND CURRENTS MAY BE ENCOUNTERED WITHIN THE CHASSIS. THE SERVICING INFORMATION CONTAINED WITHIN THIS DOCUMENT IS ONLY FOR USE BY ELECTRO-VOICE AUTHORIZED WARRANTY REPAIR STATIONS AND QUALIFIED SERVICE PERSONNEL. TO AVOID ELECTRIC SHOCK, DO NO PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPER- ATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. OTHERWISE, REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL. 12 Electro-Voice • a Mark IV Company

****** Page 15 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier 9 SERVICE INFORM. ATION WARNING: No user serviceable parts inside. Extremely hazardous voltages and currents may be en- countered within the chassis. The servicing information contained within this document is only for use by Electro-Voice authorized warranty repair stations and qual- ified service personnel. To avoid electric shock DO NOT perform any servicing other than that con- tained in the Operating Instruc- tions unless you are qualified to do so. Otherwise, refer all servic- ing to qualified service personnel. NOTICE: Modifications to Elec- tro-Voice products are not recom- mended. Such modifications shall be at the sole expense of the per- son(s) or company responsible, and any damage resulting therefrom shall not be covered under war- ranty or otherwise. 9.1 Trimpot Adjustments Figure 12 is a component layout of the main circuit board for one channel (both channels use the same board). The schem- alic of the amplifier is shown in Figure 13. Several trimpots are provided for adjustment. Resistor R26 adjusts the bias. Resistor R23 sets the negative current limit and resistor R24 sets the current limit. These two resistors also affect the symmetry of clip- ping. The LF Cancel trimpot, R39, minimizes distortion caused by rip- ple on the power supply lines. 9.2 Equipment Needed To precisely adjust the trimpots, you must have the fol- lowing equipment: 1 Oscilloscope (Tektr- onix 2445 or equivalent) 1 Distortion analyzer (Sound Technoloot 1700B or equivalent) 1 15 amp ac ammeter 1 2 load rated at 1000 watts or one 4 Q load rated at 750 watts 1 8 Q load rated at 500 watts 1 Small non-conducting flat-blade screwdriver or set of plastic TV align- ment tools 12 in jumper cable 1 with alligator clips on each end Miscellaneous handtools (to remove the top cover) NOTE: If you need to verify the amplifier’s performance against the rated specifications, you must be able to maintain the ac line voltage constant at 120 V ac (or 240 V ac if wired according to Figure 2b). Therefore, we recom- mend a suitably rated variac (50 ampere rating at 120 V ac). 9.3 Adjusting R39, the LF Cancel Trimpot Shown in Figure 6 is a distortion waveform resulting from an improperly adjusted R39. Notice the near sawtooth appear- ance of the waveform. The trace in Figure 7 shows the resulting waveform after R39 is properly adjusted. Notice the reduction in ripple. To adjust R39 for minimum rip- ple, follow the procedures below: 4. 5. 6. 9.4 level control of Channel 1 to its full clockwise posi- tion. Rotate the input lev- el control of Channel 2 to its full counter-clockwise position. Apply power to the ampli- fier and adjust the sine- wave generator for a 60 Hz, O dBu (0.775 V rms) output level. For this ad- justment, it is not neces- sary to maintain a const- ant 120 V ac line input voltage under load. Find R39 on the compon- ent layout in Figure 12. With a non-conducting or plastic-shaft screwdriver, adjust R39 for least amo- unt of ripple as shown in Figure 7. Repeat steps 3 through 5 for Channel 2. Turn off the generator’s output signal. If you have concluded with the test and alignment procedures, disconnect the amplifier from its power source and re-install the top cover with the eleven screws pre- viously removed. Adjusting R26, the BIAS frimpot Shown in Figure 8 is a dis- 1. 2. 3. Turn power off and dis- connect the unit from its source. Make sure the unit is in the Dual mode with 8 0 loads con- nected to each channel. Remove the eleven screws securing the top cover. Refer to Figure 1 for the screw locations. Connect the sinewave gen- erator output of the anal- yzer to the input of Chan- nel 1. Rotate the input tortion waveform resulting from an adjusted R26. Noti- ce the pronounced spikes at the crossover in the waveform. The trace in Figure 9 shows the waveform with less pronounced spikes after R39 is properly ad- justed. To adjust R26 for the proper bias, follow the procedures below: 1. Electro-Voice • a Mark IV Company Turn B)wer off and dis- connect the unit from its power source. Make sure 13

****** Page 16 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier 2. 3. 4. 5. 6. 7. 8. the unit is in the Dual mode with 8 Q loads con- nected to each channel. Remove the eleven screws securing the top cover. Refer to Figure 1 for the screw locations. Connect the sinewave generator output of the analyzer to the input of Channel 1. Rotate the in- put level control of Chan- nel 1 to its full clockwise position. Rotate the input level control of Channel 2 to its full counter-clock- wise position. Apply power to the amp- lifier and adjust the sinewave generator for a 1 kHz, O dBu (0.775 V rms) output level. For this ad- justment, it is not nec- essary to maintain a con- stant 120 V ac line input voltage under load. Find R26 on the compone ent layout in Figure 12. Rotate the shaft of R26 slowly clockwise until the spikes are minimized in the distortion waveform as shown in Figure 9. Repeat steps 3 through 5 for Channel 2. Check the ac idle current draw. With both channels at idle, the ac line current should be approximately 1 amp or less. If the idle current draw exceeds I amp, rotate R26 counter- clockwise slightly on both channels until the idle current is no more than 1 amp. Turn off the generator’s output signal. If you have concluded with the test 9.5 and alignment prcx•edures, disconnect the amplifier from its power source and re-install the top cover with the eleven screws previously removed. Adjusting R23 and R24, the Negative and Posi- tive Current Limit Trimpots Shown in Figure 11 is an asymmetrically clipped waveform caused by an improperly adjusted psitive current limit as deter- mined by R24. Had R23 been imp- roperly adjusted, the negative half of the waveform would be clipped as well, but its degree of clipping is a function of R23 only and is independent of R24. In the following procedures, you will be adjusting the current limit thresholds by varying R23 and R24 in such a way so as to insure symmetrical clipping. 4. 5. 6. 1. 2. 3. Turn pwer off and dis- connect unit from power source. Make sure the unit is in the Dual mode with a 2 0 load connected to the channel under test. If you do not have a 2 Q load, you may use a 4 Q load or even an 8 Q load. The higher the load impe- dance, however, the less likely it is you will have symmetrical clipping on Fieaks into lower impe- dance loads. Remove the eleven screws securing the top cover. Refer to Figure 1 for the screw lcxations. Connect the sinewave gen- erator output of the anal- yzer to the input of Chan- nel 1. Rotate the input level control of Channel 1 to its full clockwise posi- tion. Rotate the input le- vel control of Channel 2 to its full counter-clock- wise position. Find R23 and R24 on the component layout in Fig- ure 12. Reach into the amplifier and rotate the shafts of R23 and R24 to their full clockwise posi- tions. Apply rx)wer to the ampli- fier and adjust the sine- wave generator for a 1 kHz, —10 dBu (0.245 V rms) output level. For this adjustment, it is not nec- essary to maintain a con- slant 120 V ac line input under load. Increase the level of the generator until the output of the amplifier reaches 42.43 V rms (which corre- sponds to 900 watts out- put into the 2 0 load). ‘Ihe ac line current draw will be approximately 19 amps. Although the fuse installed is a 15 amp fuse, it should not blow during this test unless the amp- lifier is operated contin- uously for an extended }priod of time. If a 2 Q load is unavail- able, use either the 4 or 8 O load and increase the generator output level ac- cordingly to the corres- ponding rated output po- were While monitoring the dis- tortion waveform on the rotate R23 counter-clockwise until the negative half of the waveform just begins to visibly clip (more pro- nounced spikes will ap- Electro-Voice • a Mark IV Company

****** Page 17 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier 8. 9. 10. 11. 9.6 pear on the distortion waveform). Then, rotate slightly clockwise just until the visible clipping disappears and the spikes in the distortion waveform reduce to their pre-clip level. Repeat Step 7 for the posi- live current limit pot R24. You may have to slightly re-adjust R23. If R23 and R24 are pro- perly adjusted, the chan- nel should clip symmet- rically (@ 1% THD) at ap- proximately 1000 watts as shown in Figure 11. Repeat Steps 3 through 9 for Channel 2. Turn off the generator’s output signal. If you have concluded with the test and alignment procedures, disconnect the amplifier from its pwer source and re-install the top cover with the eleven screws previously removed. Checking the Short Circuit Current With one channel operat- ing at full rated pwer into an 8 Q load, carefully short the output terminals using the 12 inch jump- er cable while monitoring the ac line current. The ac line current draw under a short circuit condi- lion should be less than 3 amps (typically 1.5 to 2 amps). If it exceeds 3 amps, you need to re- adjust R23 and R24 by rotating them slightly counter-clockwise, both by approximately the same amount, until the ac line current is under 3 amps. Repeat this pro- cedure for Channel 2s 9.7 Ordering Replacement Parts To order replacement parts, look up the ordering number from the component parts listing and call (405) 324-5311, PAX (405) 324-8981, or write: Electro-Voice Replacement Parts Sales 600 Cecil Street Buchanan, MI 49107 U.SA 9.8 Factory Service If factory service is required, ship the unit in its original packing prepaid to: Electro-Voice Customer Service/Repair 600 Cecil Street Buchanan, MI 49107 U.S.A Tel: (616) 695-6831 FAX: (616) 695-1304 Electro-Voice Customer Service/Repair 8324 noe Avenue Visalia, CA 93219 U.SA Tel: (209) 651-7777 FAX: (209) 651-0164 Enclose a note describing the pro- blem in as much detail as possible. Include any additional helpful in- formation such as test conditions, where used, how used, etc. 9.9 Technical Assistance For applications assistance or other information, contact the Technical Services Manager. You can cnll (616) 695- 6831, rrwx 810-270-31353, FAX (616) 695-1304, or write: Electro-Voice Technical Services Manager 600 Cecil Street Buchanan, MI 49107 U.SA Electro-Voice • a Mark IV Company 15

****** Page 18 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier R HI SRDJUSTED Figure 6 Results with Improperly Adjusted LF Cancel Figure 8 Results with Adjusted Bias R24 HI SRDOUSTED Figure 10 Improperly Adjusted Positive Current Limit R 39 PROPERLY ADJUSTED Figure 7 Results with Properly Adjusted LF Cancel Figure 9 Results with Properly Adjusted Bias R23 R24 PROPERLY ADJUSTED Figure 11 Properly Adjusted Pos and Neg Current Limit 16 Electro-Voice • a Mark IV Company

****** Page 19 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier øcy ttz ceo Figure 12 Component Layout of Main Channel Board Electro-Voice a Mark IV Company 17

****** Page 20 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier illiLL tcsnt .9 18 Figure 13 Schematic of 7600, Sheet 1 of 2 Electro-Voice • a Mark IV Company

****** Page 21 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier »zz,.ræ• Figure 13 Schematic of 7600, Sheet 2 of 2 Electro-Voice a Mark IV Company 19

****** Page 22 ****** Reference Designator RI, R2, 113, FU, R5, R6, R7, R8 RIO, RII R16, R36, R37, R38, R45 RI 7 RIB R19 R20 R22, R29, R41 R25 R26 RS2 R33 R39 R42 R43, R46 R47 Cl, C2, C23 C12, cu C24 C25 C26 CRI, CR2, CR9, CRIO, CR15, CR16, CR23, CR24, CR25, CR26, CR27 CR3 CR4, CR19, CR21 CR7, CRS 20 Operating and Servicing Instructions Tor the Electro-Voice 7600 Power Amplifier Component Parts Listing for the 7600 R12, R13, R14, R15 R21, R23, R24 R27, R28 R34, R35, R49, R50 R40, R48 CIS, C19, (20, C21 Ordering Number 47-09- 125029 53-01-125094 47-01-125064 47-03-124805 47-01-028404 47-06-124770 47-01- 125106 47-01-125099 47-01- 125101 47-01-125102 47-01-102080 47-06- 125100 47-09-125021 47-06-125035 47-01-102208 47-01- 47-03-125105 47-03-125033 47-06-125104 47-01-125066 47-01-102124 47-01-102098 21-01-110310 47-01-109298 15-06-037468 15-01-125026 15-02-124437 15-01-124503 15-06-124587 15-06-124637 15-06-124588 15-01-036110 15-06-100113 15-01-125024 15-01-124508 15-01-124502 56-01-026510 48-01-125067 48-02-037580 39-01-124540 48-01-122988 Name and Description Resistor, 2 x 0.22 n, 5 watt, 5% Resistor, 100 Q @25 oc, Positive Temperature Coefficient Resistor, 22 Q, 5 watt, Resistor, 7.5 ld), 0.25 watt, 1%, metal film Resistor, 47 kQ, 0.5 watt, 5%, carbon film Potentiometer, 2.5 kQ, log taper, rotary detented, Resistor, 7.87 kQ, 0.5 watt, 1% metal film Resistor, 127 Q, 0.25 watt, 1% metal film Resistor, 47 n, 0.25 watt, 5% carbon film Resistor, 3 kn, 5 watt, 5% Resistor, 1.2 kQ, 0.25 watt, 5% carbon film Trimpot, 2.5 kQ, 0.25 watt, horizontal mount with shaft Resistor, 50 @25 ‘C, Negative Temperature Coefficient Trimpot, 100 0, 0.25 watt, horizontal mount with shaft Resistor, 4.7 Q, 0.5 watt, 5% Resistor, 4.7 n, 5 watt, 5% Resistor, 14 kQ, 0.5 watt, 1% metal film Resistor, 49.9 ld”), 0.5 watt, 1% metal film Trimpot, 5 kQ, 0.15 watt, vertical mount Resistor, 10 k0, 3 watt, Resistor, 75 kQ, 0.25 watt, 5% carbon film Resistor, 6.8 kQ, 0.25 watt, 5% carbon film Resistor, 0 C) jumper Resistor, 180 kQ, 0.25 watt, 5% carbon film Capacitor, 100 pF, 160 volt, 5%, polypropylene Capacitor, 6.8 gF, 50 VDC, non-polar, Aluminum Capacitor, 0.1 VF, 50 VDC, ceramic disk Capacitor, 100 PR, 50 VDC, Aluminum Capacitor, 0.001 gF, 100 VDC, 5%, polypropylene Capacitor, 0.1 PP, 100 VDC, 5%, polypropylene Capacitor, •0.01 PF, 100 VDC, 5%, polypropylene Capacitor, 4700 pF, 100 VDC, Aluminum, 10% Capacitor, Oel pF, 250 VDC, 10%, Polyester Capacitor, 4.7 gF, 160 VDC, Aluminum Capacitor, 47 gF, 50 Aluminum Capacitor, 10 PF, 50 VDC, Aluminum Inductor, 2.0 PH, choke Diode, IN4937, fast recovery rectifier Bridge Rectifier, 1.5 Amp, 70 V LED, red, with 12 inch leads Zener, IN5231B, 5.1 volt, 0.5 watt, 5% Electro-Voice a Mark IV’ Company

****** Page 23 ****** Operating and Servicing Instructions for the Electro-Voice 7600 Power Amplifier Reference Designator CRII, CR13, CR17, CR18,CR20 CR22 QI, Q2, Q3, Q4, Q9 Q10, Qll, Q12 Q5, Q6, Q7, Q8, Q13 Q15, Q16 Q17 Q18 Q19, Q21 Q20 CRI, CR2 RI TSI Ordering Number 48-01-125098 39-01-121926 17-01-122832 48-03-122979 48-03-122978 48-03-124475 48-03-124474 48-03-028711 48-03-028712 15-02-124994 150-125108 48-02-122651 48-02-125089 51-04-125092 47-01-102224 51-02-124582 56-08-027872 53-01-027945 51-04-122930 28-13-026422 35-01-124521 47-02-123106 Name and Description Zæner, IN4744A, 15.0 volt, 1 watt, 5% LED, red, With 12 inch leads IC, NE5532A Transistor, Transistor, Transistor, Transistor, Transistor, Transistor, MJ15025, PNP MJ15024, NPN 2SA958Y, PNP 2SC2168Y, NPN MPS-U05, NPN MPS-U55, PNP Capacitor, 0.22 pF, 250 VAC Capacitor, 0.0033 up, 250 VAC Bridie Rectifier, 25 amp, 400 volt Triac, Q4025P, 25 amp, 400 volt Fuse, 15 amp, 250 volt, Time Delay Resistor, 22 Q, 0.5 watt, 5% S’*itch, iY)wer Transformer, power Thermostat, 170 e F, normally Fuse, 8 amp, 250 volt, NB.UL-CER Hardware, rack mount Fan, equipment cooling, 100 CFM Resistor, 300 Q, 25 watt, 5% Electro-Voice • a Mark IV Company 21

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