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****** Page 1 ****** POWERAMPLIFIERS OWNER’S MANUAL COPY AP2300191 AP2300 POWERAMPLIFIER AP2300SA POWERAMPLIFIER WITH STEPPED ATTENUATORS
****** Page 2 ****** EV AP2300 POWER AMPLIFIER FEATURES AND DESCRIPTION OWNER’S MANUAL TABLE OF CONTENTS SPECIFICATIONS OPERATION Front Panel Indicators Back Panel Connections and Controls INSTALLATION Amplifier Input Connections Auxiliary Line Output Connections Speaker Output Connections Speaker Protection Fuse Selection 10 Compression Driver Protection 11 Modes of Operation 11 Primary Voltage 12 Alternate Primary Voltage 12 Mounting 13 Cooling 13 Final Instructions 13 SCHEMATIC DIAGRAMS 14 SERVICE/WARRANTY INFORMATION 16 Shipping Damage 16 Factory Service 16 Warranty 16 WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIP- MENT TO RAIN OR MOISTURE.
****** Page 3 ****** EV AP2300 POWER AMPLIFIER FEATURES • The amplifier’s two channels can operate inde- pendently of each other, or may be bridged into an 8-ohm load. Differential inputs can be made to either an XLR-type connector or a terminal barrier strip. Octal sockets permit a variety of plug-in acces- sories to be used with the amplifier. Front panel LED’s show when the power is on, the output signal is clipping, and the amplifier is in the protection Input levels are controlled independently for each channel. Primary voltage may be configured to run on 100, 120, 200, 220 or 240 volts. Stepped input attenuators (AP2300SA) and continuously variable attenuators (AP2300) are available. Convection cooling is used for quiet operation. Inputs are electronically balanced (optional APM-I plug-in transformer available). Level controls are located on the back panel to prevent “accidental” changes. one OWNER’S MANUAL DESCRIPTION The AP2300 is a dual-channel power amplifier for professional sound reinforcement. The AP2300SA features stepFÄi attenuators that are calibrated in 1 -ciB steps from O to 20 dB attenuation, 2-dB steps from 20 to 30 dB attenuation and 3-dB steps for attenuation beyond 30 dB. The AP2300 uses continuously variable attenuators. The two units are identical in all other respects. Each channel can deliver 100 watts of power into an 8-ohm load or 150 watts into a 4-ohm load over the full audio frequency range. In bridge mode, the amplifier will deliver more than 300 watts into an 8- ohm load at less than O. 10% THO. Input attenuators are located on the rear panel. Clip and protect LED indicators are located on the front panel. Efficient heat sinking and self-contained forced-air cooling enhance the reliability of the unit. Each channel is independently protected against Overtemperature Excessive output voltage Excessive phase shift Radio-frequency interference Shorted loads The load is protected from turn-on and turn-off tran- sients, infrasonic signals, low ac line voltage and dc. When a problem is detected, an output relay automatically disconnects the load from the amplifier’s output and activates the protect LED on the front panel.
****** Page 4 ****** EV AP2300 POWER AMPLIFIER CONDITIONS 1. O dBu = 0.775 V rms. OWNER’S MANUAL SPECIFICATIONS 2. Dual-mode ratings are for each channel. 3. Both channels operating at rated output power unless noted. 4. 120-volt ac line voltage maintained throughout testing. CONTINUOUS RATED OUTPUT POWER (20 Hz- 20 kHz at less than 0.1% THD, 30-kHz measure- ment bandwidth) Dual Mode, 4 0: 150 watts/channel Bridge Mode, 8 : 300 watts Dual Mode, 8 Q: 100 watts/channel Bridge Mode, 16 Q: 200 watts MAXIMUM MIDBAND OUTPUT POWER (1 kHz, THD) Dual Mode, 4 Q: 200 watts/channel Bridge Mode, 8 Q: 400 watts Dual Mode, 8 Q: 125 watts Bridge Mode, 16 0: 250 watts DYNAMIC HEADROOM (1 kHz, 1% THDj any 21 dB POWER BANDWIDTH (1 kHz, +0/-3 dBrwhere O dBr = rated output power in any 10 Hz -50 kHz VOLTAGE GAIN REFERENCE (1 kHz) Dual Mode, 4 or 8 n: 30 dB Bridge Mode, 8 or 16 n: 36 dB INPUT SENSITIVITY FOR RATED OUTPUT POWER (1 kHz) Dual Mode, 4 n: O dBu (0.775 V rms) Bridge Mode, 8 0: O dBu (0.775 V rms) Dual Mode, 8 Q: +1.2 dBu V rms) Bridge Mode, 16 n: +1.2 dBu (0.890 V rms) MAXIMUM INPUT LEVEL (1 kHz) +20 dBu (7.75 V rms) INPUT IMPEDANCE (1 kHz) Balanced: 15 kn Unbalanced: 15 kn (non-inverting input) PHASE RESPONSE (at rated output power, any mode) 20 Hz: -250 two THD (any 30 kHz measurement bandwidth) IMD (SMPTE 4:1, any mode) TIM (DIM 100, any mode) RISE TIME (10% to 90%, any mode) 18 V/psec Bridge Mode, 8 or 16 0: >36 V/psec DAMPING FACTOR (dual Mode, 8 Q) 20 Hz- 1 kHz: >200 20 kHz: CROSSTALK (1 kHz, O dBr = rated out- put power into 8 n, single channel operating) dBr NOISE (below rated output power, A-weighting fil- ter, any 50/60-Hz line frequency) > 100 dB AMPLIFIER PROTECTION Excessive output voltage Shorted outputs Excessive phase shift Radio-frequency interference Overtemperature LOAD PROTECTION Startup/shutdown transients dc faults Infrasonic signals Low ac line voltage COOLING Convection OUTPUT TOPOLOGY True complementary symmetry OUTPUT TYPE Dual Mode: Unbalanced, each channel Bridge Mode: Balanced OUTPUT DEVICES Total number. 8 devices (both channels) Pdmax rating: 150 watts vceo: 200 volts dc lc: 15 Adc Tjmax: 150 Oc (302 OF)
****** Page 5 ****** Two continuously variable input attenuators (AP2300) or stepped attenuators (AP2300SA), rear Bridge switch, rear Power switch, front STEPPED ATTENUATOR STEP SIZES (AP2300SA only, from full clockwise position) Click Position EV AP2300 POWER AMPLIFIER CONTROLS AND SWITCHES 1 -20 25 – 26 26 ¯ 27 27 – 28 29 – 30 30 – 31 OWNER’S MANUAL SPECIFICATIONS ENCLOSURE 20 – 28 – 25: 29: I-dB steps (20 dB attenuation at 20) 2-dB steps (30 dB attenuation at 25) 3dB step (33 dB attenuation at 26) 4-dB step (37 dB attenuation at 27) 4-dB step (41 dB attenuation at 28) 4-dB step (45 dB attenuation at 29) 5-dB step (50 dB attenuation at 30) off (-03 at 31) Rack-mount chassis, 16-GA steel bottom/sides, 18-gauge steel top/back, 3/16-inch 6061-T6 aluminum front panel SHIPPING WEIGHT 21.8 kg (48 lb) NET WEIGHT 17.7 kg (39 lb) SUPPLIED ITEMS Four ‘U” jumper plugs for octal sockets (two per socket installed) One owner’s manual One detachable power cord with three-prong male plug OPTIONAL INPUT ACCESSORIES FRONT-PANEL INDICATORS Power LED Clip LED’s (two), one per channel Protect LED CONNECTIONS Input: 6-terminal barrier strip, female XLR-type con- nectors (two), octal accessory sockets (two), with Y-15 volts dc power Output: 4-terminal barrier strip Power: 3-terminal IEC ac line receptacle POWER REQUIREMENTS 100, 120, 200, 220, 240 V ac, 50/60 Hz, 560 watts (at 120 V ac) POWER CONSUMPTION/HEAT PRODUCED (both channels operating in dual mode with 1 kHz input signal at stated output power into 4 Q loads) One-Third Midband Power: 560 watts/l .48 kBTU/hr Rated Power: 750 watts/l .54 kBTU/hr Maximum Midband Power: 850 watts/l .56 kBTlJ/hr OPERATING TEMPERATURE RANGE up to 60 Oc (140 OF) ambient DIMENSIONS Height: 13.3 cm (5-1/4 in.) Width: 48.3 cm (19 in.) Depth: 27.9 cm (1 1 in.) COLOR Black Model APM-I APL-125 APL-500 APL-800 APL-1250 APH_125 APH_315 APH-500 APH-800 APH-1250 APX Description 15-1<0 bridging input transformer with fixed pad options 3rd-order Butterworth (1 8 dB per octave) low-pass filters at indicated corner frequencies 3rd-order Butterworth (18 dB per octave) high-pass filters at indicated corner frequencies 4th-order Linkwitz-Riley (24 dB per octave) crossover filter with 24 switch-selectable frequencies on ISO 1/3-octave centers from 50 Hz to 10kHz OPTIONAL OUTPUT ACCESSORIES Model ATIOO AT300 TR150 TR300 Description 100-watt autoformer with 4-, 8- 16-, 50-, 70.7- and 100- n taps 300-watt autoformer with 2.67-, 4-, 5.33-, 8- and 16- n taps 150-watt, 70.7-volt transformer 300-watt, 70.7-volt transformer three ****** Page 6 ****** 33.w: EV AP2300 POWER AMPLIFIER vs. nn.ux) LEVEL VS. FREQUENCY •naw vs. dNE CHÅNÅE[ TH CHANNELS' TING æRATING HEADROOM VS. FREQUENCY OWNER'S MANUAL ct»-eotcr i h. nm.(h) LEVEL + PHASE VS. FREQUENCY i-m vs. nn.(ht) nø.e 148. Ill NOISE VS. FREQUENCY four ****** Page 7 ****** EV AP2300 POWER AMPLIFIER 'naw B. UUL Arna THO + NOISE VS. POWER (20 kHz) OWNER'S MANUAL THO + NOISE VS. FREQUENCY THO + NOISE VS. POWER (20 Hz) anz•ø H. (utts) Apnae e. net LDL THO + NOISE VS. POWER (1 kHz) five ****** Page 8 ****** EV AP2300 POWER AMPLIFIER ELICIRO-'OICZ -ss.æt -cø.w, -73. Pi -ss.w: CMRR VS. FREQUENCY n.tcr»-eotcz a-IANNEL OWNER'S MANUAL Apl CXrSStAiZ(U) es. m-EIQ u. SMPTE VS. POWER CROSSTALK VS. FREQUENCY six ****** Page 9 ****** EV AP2300 POWER AMPLIFIER POWER AMPLIFIER 2 OPERATION OWNER'S MANUAL AP23Ø EM. 2 1 3 Pictorial 1 – Front Panel Diagram FRONT PANEL INDICATORS (referto Pictorial 1). 1. POWER INDICATOR : This LED is located direct- ly below the power switch and lights when the unit is on. 2.CLlP INDICATORS: These LED's will light when the peak value of the output signal approaches the dc operating rail. 3.PROTECT INDICATOR: This LED will light when the amplifier has detected a fault condition and is in the protect mode. seven ****** Page 10 ****** EV AP2300 POWER AMPLIFIER 7 OPERATION 2 3 6 2 OWNER'S MANUAL 4 eeee 5 Pictorial 2 – Back Panel Diagram 7. POWER CORD RECEPTACLE: This receptacle is for the supplied three-prong male power cord. BACK PANEL CONNECTIONS AND CONTROLS (refer to Pictorial 2). 1. AC FUSE RECEPTACLE: This holder requires either a 5-A, 950-V Normal-Blo fuse (for 100/120-V ac operation), or a 2.5-A, 250-V Normal-Blo fuse (for 200/220/240-V ac operation). 2. INPUT ATTENUATORS: These controls adjust the input levels for both channels. 3. ACCESSORY SOCKETS: These octal sockets allow the use of several accessories. See the SPECIFICATIONS section, page 3, for a listing of all compatible accessories. 4. CHANNEL OUTPUT CONNECTIONS: This ter- mina! strip is for speaker connections, either in the dual or bridge 5. MODE SWITCH: This switch enables either the dual or bridge mode of operation. 6. CHANNEL INPUT CONNECTIONS: Differential input connections can be made to either the terminal strip or the XLR-type connectors. eight ****** Page 11 ****** EV AP2300 POWER AMPLIFIER SOURCE Balanced AMPLIFIER INPUTS Sotrce a ance S0Lrce soon rmlnatl NC 2 3 2 3 2 3 2 3 (-1 :rmrtvn I-I Lo ( see note 1 620 NC Hot n balanced Sotrce nbalanced m see Hot note 2 Com gee note 2 OWNERS MANUAL AUXILIARY UNE OUTPUTS (USER OPTIONS; SEE INSTALLATION SECTION) n NC Hot Input Com NC Note 1. Not recommended for cable runs over 100 ft (30 m) Note 2. Not recommended for cable runs over 6 ft (2 m) Figure 1 – Typical Input Connections INSTALLATION Amplifier Input Connections Differential input connections are made to either the terminal strip or the XLR-type connector. The chan- nel input connectors are wired in parallel. Pin 2 of the XLR-type connector is (+), pin 3 is (—),and pin 1 is ground. The polarity of the terminal is marked on the barrier strip. Tie the low (—) side of the signal to ground when using an unbalanced line. See the left half of Figure 1 for typical input connections. Auxiliary Line Output Connections The XLR-type and terminal barrier strip connectors are wired in parallel. Since the input impedance of the amplifier is high, there is minimal loading on the signal source. Thus, when input connections are made to one connector, the other may be used as an auxiliary tine output to feed other high-input-im- pedancé equipment. See the right half of Figure 1 of possible applications. nine Speaker Output Connections Termination of the speaker line(s) is made to the 4- terminal barrier strip. The polarity for each channel is marked, as is proper speaker termination for bridged operation. See Figure 2, page 10, for typical output configurations. See the following sections for sug- gestions on choosing protection fuses and capacitors. Before making output connections, the input at- tenuators should be turned off (full counterclock- wise). This will eliminate any chance of damage to the loudspeaker. Speaker cables of sufficient gauge for the length used are important. Cables that are too small result in a lower damping factor and power loss due to cable resistance. The nomograph in Figure 3, page 10, will aid in selection of the proper gauge cable. To use the graph see the following instructions. ****** Page 12 ****** EV AP2300 POWER AMPLIFIER pea CH.2 DWI Mode 04.2 Dual Mode CH.I CH. 2 Brld Mode u utput• LOADS LOWS HIGHS Figure 2 – Typical Output Connections 1. Note the load resistance of the speakers con- nected to each channel of the amplifier. Mark this value on the nomograph Load Resistance line. c OAO 2 OWNER'S MANUAL 2. Choose an acceptable system damping factor (50 is typical). Mark this value on the Damping Factor line. 3. Draw a pencil line through those two points, inter- secting the Source Resistance line. 4. Mark the length of the cable run on the 2-Cond. Cable line. 5. Draw a pencil line from the intersection point on the Source Resistance line through the mark on the 2-Cond. Cable line. 6. Note where this pencil line intersects the Annealed Copper Wire line. This value is the required gauge of the speaker cable. 7. If the size of the cable is unacceptable, settle for a lower damping factor and try again. Speaker Protection Fuse Selection Sometimes it is desirable to use in-line fuses to protect loudspeaker systems. It is difficult to deter- mine the proper fuse value with the correct time lag and overload characteristics to match the limitations of a given speaker system. The values shown in Table 1, page 11, should serve as a guide only To use, determine the ower ratin and load value. Select a 2 .a 2 Figure 3 – Source Resistance and Damping Factor vs. Length and Size of Output Leads ten ****** Page 13 ****** EV AP2300 POWER AMPLIFIER standard value fuse of the next smaller value to the one in the table. FUSE VALUES 4-0 LOAD 8-0 LOAD POWER 50 w 200 w 300 w 400 W Table 1 – LOAD 1.31 A 1.85 A 2.62 A 3.21 A 3.70 A OWNER'S MANUAL capacitors of at least 50 volts (preferably 100 vdts) are recommended, but electrolytics are usable if they are nonpolar. Table 2 shows the recommended capacitor values for use with 8- and 16-ohm drivers at popular crossover frequencies. CAPACITOR VALUES CROSSOVER 8-0 DRIVERS 16-0 DRIVERS 2.62 A 3.70 A 5.24 A 6.42 A 7.41 A 1.85 A 2.61 A 3.70 A 4.54 A 5.24 A Calculated Speaker Protection Fuse Values FREQUENCY 500 Hz 800 Hz 1000 Hz 1200 Hz 2000 Hz 3500 Hz 7000 Hz 80 50 PF 40 pF 33 20 12 40 pF 25 20 pF 16 pF 10 3 1..LF The values are calculated for fast-blow fuses which will carry 135% of their current rating for an hour but will blow within one second at 200%. Other fuse values may be calculated for different power levels from the following equation: pout X RL Fuse value (amperes) RLX 1.35 where RL is the load impedance and Pout is the power rating. Use 32-volt fuses if possible. They typically have the lowest internal resistance which will minimize deterioration of the amplifier's damping factor. Refer to Figure 2, page 10, for additional information. Compression Driver Protection Compression drivers, used for middle- and high-fre- quency sound reproduction, are much more suscep- tible 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 power amplifier, or from misadjustment of the crossover. Either of these could apply low-frequency signals or hum to the driver and cause damage. To prevent a potential mishap, it is recommended that a capacitor be used between the amplifier and the compression driver to suppress low frequencies and possible dc. Refer. to Figure 2, page 10, for installation details. In choosing a value, be careful not to interfere with the crossover frequency. As a general rule, select a capacitorwhose break frequency, with respect to the load, is 3 dB down at approximately one-half of the high-pass corner frequency of the crossover. Mylar Table 2 – Compression-Driver Protection Ca pacitors Modes of Operation Dual Channel: In this the amplifier's two channels operate independently of one another. Channel one's output is controlled by the channel one input attenuator. The same is true for channel two's output. The mode switch must be in the dual position. Bridge: In this configuration, the amplifier can deliver 300 watts into an 8-ohm load. It is recommended that the load be greater than 4 ohms. use the following directions to set the amplifier for bridge operation. 1. Set the rear panel switch to the bridge position. 2. Attach an input line to the channel one input only. Level adjustment is done with the channel one at- tenuator. 3. Do not use the channel two input; othemtise dis- tortion may result. When in the bridged mode, dis- connect the channel two input and turn the channel two input attenuator to the off position (full counterclockwise). 4. Connect the load across the two plus (+ ) terminals at the output barrier strip. Do not use either of the minus (—) terminals at the output strip. The channel one plus (+) output is in phase with pin 2 (+) of the channel one input connector. eleven ****** Page 14 ****** EV AP2300 POWER AMPLIFIER Primary Voltage The amplifier is provided from the factory with the primary of the power transformer wired for 120 volts. Make sure that the rear of the unit is marked for 120- volt operation before connecting the power cord. Hazardous voltages and currents may exist within the chassis. The service information contained within this document is for use only by Electro- Voice authorized warranty stations and qualified OWNER'S MANUAL Alternate Primary Voltage The amplifier can be powered with line voltages other than 120 volts by altering the primary wiring of the power transformer. Table 3 lists the primary wire color, the terminal block (TB), and where the TB wire should be located for operation at the desired volt- age. To alter the transformer primary wiring configuration use the following procedure: 1 Disconnect the amplifier from the ac power source. 2. Remove the 14 screws securing the top cover. service personnel. Permanent Connections' tB2 Factory Wiring (120 V) TBt tB2 FUSE PWR SW (ELK) SW BRN 2 200 v TBf NEUTRAL (WH) BRN FAN 220 v TB2 7 QKMH O..XMH 100 v 782 BRN 240 v 782 BLKhYH s BLK BAN WH DO NOT MOVE THESE WIRES. THEY ARE COMMON TO ALL PRIMARY VOLTAGES Table 3 Primary Power Conversion Chart for 100-, 200-, 220-, and 240-V, 50/60-Hz Operation twelve ****** Page 15 ****** EV AP2300 POWER AMPLIFIER SERVICE INFORMATION Shipping Damage Inspect the shipping carton for possible damage. If damage is found, notify the transportation company immediately. Save the carton as evidence for the car- rier to inspect. If damage occurs during shipping, it is the responsibility of the consignee to file a claim with the carrier. If the carton is in good condition but the amplifier is damaged, call Electro-Voice. Factory Service If factory service is required, ship the unit prepaid in its original carton to: Electro-Voice,lnc. CustomerService/Repair 10500 W.Reno Oklahoma City, 0K 73128 Enclose a note describing the problem along with any other helpful information such as where and how the unit is used. (C OWNER'S MANUAL WARRANTY (Limited) – Electro-Voice Professional Sound Reinforcement Electronic Components are guaranteed for two years against malfunction due to defects in workmanship and materials. If such malfunction occurs, unit will be repaired or replaced (at our option) without charge for materials or labor if delivered prepaid to the proper Electro-Voice service facility. Unit will be returned prepaid. Warranty does not extend to finish, appearance items or malfunction due to abuse or operation under other than specified conditions, nor does it extend to incidental or consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusion may not apply to you. Repair by other than Electro-Voice or its authorized service agencies will void this guarantee. A list of authorized service centers is available from Electro-Voice, Inc., 600 Cecil Street, Buchanan, MI 49107 (AC/616-695- 6831); Electro-Voice, Inc., 3810 148th Avenue N.E., Redmond, WA 98052 (AC/206-881-9555); and/or Electro-Voice West, 8234 Doe Avenue, Visalia, CA 93291 (AC/209-651-7777). This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Service and repair address for this product: Electro-Voice, Inc., 10500 W. Reno, Oklahoma City, 0K 73128 Specifications subject to change without notice. sixteen ****** Page 16 ****** EV AP2300 POWER AMPLIFIER AP2300 SCHEMATIC OWNER'S MANUAL fourteen ****** Page 17 ****** EV AP2300 POWER AMPLIFIER AP2300 INPUT BOARD SCHEMATIC OWNER'S MANUAL fifteen ****** Page 18 ****** EV AP2300 POWER AMPLIFIER 3. Locate the two voltage-selection terminal blocks mounted on the crossbar between the heatsinks. The transformer has six primary leads. The colors are black, brown, white, black/white, brown/white and white/black. Disconnect the primary leads of the power transformer by pulling each wire firmly to dis- engage it from the terminal connector. Select the desired operating voltage on Table 4 and reconnect the wires accordingly. Push each wire firmly into the connector to snap it in place. 4. Install the correct line fuse (values in Table 4). 5. Plug the amplifier into a variac and sweep the mains voltage from zero to full operating voltage while monitoring the amplifier's dc rail voltages. The dc rail voltage should be approximately V dc, + 5% at the selected primary voltage. 6. Reinstall the top cover with the 14 screws. MAIN FUSE VALUES LINE VOLTAGE 100 V ac 120 V ac 200 V ac 220 V ac 240 V ac LINE FUSE, 314 SERIES, NORMAL-BLO 5 N250 V 5 A1250 V 2.5 A/250 V 2.5 A'250 V 2.5 A/250 V OWNER'S MANUAL Final Instructions 1. Do not operate the amplifier in a completely closed, unventilated housing. 2. Do not connect the outputs of the channels in parallel. 3. Do not connect the output terminals to a battery, power supply, or the power mains. Damage caused from such a hookup is not covered by the warranty. 4. Be careful when making connections, selecting signal sources and controlling the output level. 5. Do not tie the input signal ground to the ground lead of an output. oscillations may occur. 6. Ensure that the main ac power is within 10% of selected voltage and frequency. Failure to operate the unit within these limits voids the warranty. 7. Use only the proper size mains fuse for the selected ac voltage, as indicated in Table 4. 8. Do not connect either side of the loudspeaker cable to ground when operating the unit in the bridged mode. The bridge mode is balanced to ground. 9. Make certain that the test equipment is not ground referenced when testing the unit in the bridged mode. 10. Tampering with the circuit or repair by un- authorized personnel will void the warranty of the unit. Table 4 – Main Fuse Selection Guide Mounting The AP2300 may be installed in a standard 19-inch wide equipment rack and requires 3 rack spaces (5- 1/4 inches). Mounting screws are supplied. Cooling The AP2300 must be adequately ventilated to avoid excessive temperature rise. Do not impede the air flow into or out of the amplifier. If the ambient temperature exceeds 60 oc (140 OF), units should be spaced at least 1-3/4 inches apart or a blower should be installed to increase the air flow in the rack cabinet. Further, if the load is less than 4 ohms, and the rms output is high (e.g., concert sound reinforce- ment) the additional cooling space is recommended. thirteen
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OPERATING INSTRUCTIONS
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INSTRUCTION GUIDE – INSTRUCTION MANUAL