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****** Page 1 ****** 7300 STEREO POWER AMPLIFIER OWNER’S MANUAL 7300 7300 STEREO POWER AMPLIFIER
****** Page 2 ****** l. INTRODUCTION The EV 7300 was designed to deliver exceptional performance and reliability at an affordable price. Each channel delivers 200 watts of power into 8 ohms, and 300 watts into 4 ohms over the full audio frequency range. In the mono bridge mode, the 7300 can deliver over 600 watts. The APX octal crossover accessory provides the convenience of on-board, bi-amp capability. The APX module has 24 preset selectable crossover frequencies from 50 Hz to 10,000 Hz. Simply plug the module into the octal sockets provided on the rear of the amplifier and your system is bi-amp ready. The 7300 is an addition to the growing family of Electro-Voice electronic products. We would appreciate any comments you have regarding the performance, features or reliability of the 7300.
****** Page 3 ****** STEREO POWER AMPLIFIER 1. 2. 3. 4. 5. 6. 8. Table of Contents TABLE OF CONTENTS INTRODUCTION DESCRIPTION — FRONT PANEL IA Power Switch 1B. Power Status Indicator 1 C. Channel Attenuation ID. Clip Indicator 1 E. Protect Indicators DESCRIPTION — REAR PANEL 2A. Input Connectors 2B. Octal Input Sockets 2C. Dual Bridge Mode 2D. Output Connectors SPECIFICATIONS INSTALLATION 4A Operating Cautions 4B. Input Connections 4C. Output Connections 4D. Grounding 4E. Ventilation OPERATION 5A. DuaVStereo Mode 5B. Bridge Mode 5C. APX Crossover Option 5D. Alternate Operating Voltage TROUBLESHOOTING 6A. Protection SCHEMATIC SERVICE/WARRANTY INFORMATION WARNING The service information contained within this document is for use only by Electro-Voice, Inc. authorized warranty stations and qualified service personnel.
****** Page 4 ****** 7300 STEREO POWER AMPLIFIER IEs FIGURE 1 DESCRIPTION 1. Front Panel Description ,At10N IA. 1B. 7300 — Front Panel View IA 1B. Power Switch — The power Switch turns the amplifier on and off. Power Status Indicator when the unit is on. This LED indicates Input Attenuators — Clockwise rotation increases the amount of amplifier gain. Clip Indicators When the amplifier is driven into clipping, the clip indicator will illuminate. To avoid distortion reduce the input level until the LED’s no longer light. Protect Indicators The protect light illuminates when the amplifier overheats or when shorted loads or dc is detected on the amplifier output. A relay automatically disconnects the load from the channel when a prodem is detected. The amplifier wilt reset itself when the problem is corrected. See the Troubleshooting section for problem solving.
****** Page 5 ****** 7300 STEREO POWER AMPLIFIER FIGURE 2 Description 7300 POWER — Back Panel View DESCRIPTION 2. Back Panel 2A. 2B. 20. 20. Input Connectors Located on the left side are two 3-pin-XLR-type connectors and two balanced quarter-inch phone jacks. The inputs can also be unbalanced. See Figure 3 for typical input connections. Octal Accessory Sockets v—• Located above the input jacks, accessory octal sockets are provided for the APX crossover module. Twenty-four crossover frequencies are available from 50 Hz to 10,000 Hz. Dual/Mono Bridge Mode The mode switch located to the right of channel 1 input selects stereo mode or bridge-mode without any additional patching. Output Connectors — The speaker connectors are heavy-duty five-way binding posts. For protection, there is a bracket on each side of the binding posts.
****** Page 6 ****** 7300 STEREO POWER AMPLIFIER SPECIFICATIONS Specifications CONDITIONS — 1, O dBu-O.775 V rms. 2. Dual•mode ratings are for each channel. 3. Both’thannels operating at rated output power unless noted. 4. 120 volt ac line voltage maintained throughout testing. CONTINUOUS RATED OUTPUT POWER (20 Hz, reference 1 kHz) Dual Mode, 4 Ohms: 300 watts at THO Bridge Mode, B Ohms: 600 watts at THD Dual Mode, 8 Ohms: 2m watts at THD Bridge Mode, 16 Ohms: 400 watts at THO MAXIMUM MIDBAND OUTPUT POWER (reference 1 kHz, 1% THO) Dual Mode, 4 Ohms: 40) watts Bridge Mode, B Ohms: 800 watts Dual Mode, 8 Ohms: 250 watts Bridge Mode, 16 Ohms: 500 watts DYNAMIC HEADROOM (reference 1 kHz) Dual Mode, 4 Ohms: > 125 dB Bridge Mode, 8 Ohms: >1.25 dB Dual Mode, 8 Ohms: >l.o dB Bridge Mode, 16 Ohms: > 1.0 dB DAMPING FACTOR Dual Mode, 4 Ohms, 20 Hz-l kHz: >100 Dual Mode, 4 Ohms, 20 kHz: Bridge Mode, B Ohms, 20 Hz-l kHz: >200 Bridge Mode, g Ohms, 20 kHz: Dual Mode, 8 Ohm8, 20 Hz-l kHz: >200 Dual Mode, 8 Ohms, 20 kHz: Bridge Mode, 16 Ohms. 20 Hz-l kHz: >400 Bridge Mode, 16 Ohms, 20 kHz: >100 CHANNEL SEPARATION (below rated output power, single channel- operating) dB at kHz NOISE (below rated output power, A-weighted, any mode) kHz) > 100 dB AMPLIFIER PROTECTION Excessive output voltage Shorted loads Excessive phase shift LOAD PROTECTION Startup/shutdown transients dc fautt COOLING — RF interference Over temperature fnfrasonic signals Low ac line voltage POWER BANDWIDTH (+0, -3 dB, reference O dB at 1 Dual Mode, 4 Ohms: 7 Hz.70 kHz Bridge Mode, 8 Ohms: 7 Hz-60 kHz Dual Mode, 8 Ohms: 7 Hz-85 kHz Bridge Mode, 16 Ohms: 7 Hz-65 kHz VOLTAGE GAIN (reference 1 kHz) Dual Mode: 32.0 dB Bridge Mode: 38.0 dB INPUT SENSITIVITY FOR RATED OUTPUT POWER — (reference 1 kHz, ± 0.3 dB) Dual Mode, 4 Ohms: O dBu (0.775 V rms) Bridge Mode, 8 Ohms: O dBu (0.775 V rms) Dual Mode, 8 Ohms: +3 dBu (0.902 V rms) Bridge Mode, 16 Ohms: +1.3 dBu (0.902 V rms) MAXIMUM INPUT LEVEL (reference 1 kHz) — + 20 dBu (7.75 V rms) INPUT IMPEDANCE (per channel, 20 Hz-20 kHz) — Balanced: kilohms Unbalanced: > 15 kilohms PHASE RESPONSE (at rated output power, any mode) at 20 Hz: + 15 degrees at 20 kHz: —15 degrees THD (at rated output power) Dual Mode, 4 Ohms, 20 Hz.20 kHz: Bridge Mode, 8 Ohms, 20 Hz•20 kHz: Dual Mode, 8 Ohms, 20 Hz•l kHz: Dual Mode, 8 Ohms, 1 kHz.20 kHz: < 0.05% Bridge Mode, 16 Ohms, 20 Hz-l kHz: Bridge Mode, 16 Ohms, 1 kHz.20 kHz: IMD [SMPTEI (at rated output power) Duel Mode, 4 Ohms: Bridge Mode, 4 Ohms: Dual Mode, 8 Ohms: Bridge Mode, 16 Ohms: TIM [DIM 100) (at rated output power) — Dual Mode, 4 Ohms: -Bridge Mode, 8 Ohms: Dual Mode, 8 Ohms: Bridge Mode, 16 Ohms: RISE TIME (10% to 90%, at rated output power) Dual Mode, 4 Ohms: <5 gsec Bridge Mode, 8 Ohms: <6 psec Dual Mode, 8 Ohms: <4.5 psec Bridge Mode, 16 Ohms: 30 V/gsec Dual Mode, B Ohms: V/gsec Bridge Mode, 16 Ohms: >60 V/psec Heatsink: Thermally equalized 3/16-inch aluminum, black anodized heatsink Dual-Speed Fan: 106 CFM (high speed), minimum life rating of 20,000 hours at 720Ct or 43,500 hours at 250C ambient temperature OUTPUT TOPOLOGY True complementary symmetry OUTPUT TYPE Dual Mode: Unbalanced, each channel Bridge Mode: Balanced OUTPUT DEVICES Sixteen 250-watti 250-V/16-A, TO-3 transistors CONTROLS AND SWITCHES — Input level controls (two), rear switch, rear Power switch, front FRONT-PANEL INDICATORS Power LED Clip LED’s (two) Iprotect LED’s (two) CONNECTIONS — Input: 6-terminal barrier strip, female XLR•type connectors (two) Output: 4•terminal barrier strip Power: 8-foot. a-wire, 17•GA power cord with NEMA 5-15 plug POWER REQUIREMENTS 1m, 120, 200, 220, 240 V act 50/60 Hz, 900 watts POWER CONSUMPTION/HEAT PRODUCED — (both channels operating dual mode wtth 1 Wiz input signal at stated output pwer Into 4 or bridge mode into 8 ohms) Idle: 130 watts/O.442 kBTU/hr % Power: 900 watts/2.380 kBTU/hr % Power: 1060 watt’2584 kBTU/hr Rated Power: 1430 watts/2.822 kBTU/hr Maximum Mldband Power: 960 watts/l .564 kBTlJ/hr OPERATING TEMPERATURE RANGE — Up to (1400F) ambient DIMENSIONS Height: 13.3 cm (5% in.) Width: 48.2 cm (19 in.) Depth: 32.4 cm (123/4 in.) COLOR — Gray/black ENCLOSURE Rack mount chassis, 16-GA steel bottom/sides* ‘he-inch aluminum top/back, 3/16*inch 6061-T6 aluminum front panel SHIPPING WEIGHT 21.8 kg (48 lb) NET WEIGHT — 17.7 kg (39 lb)
****** Page 7 ****** 7300 STEREO POWER AMPLIFIER zzcno-U01CE AP2€eg ELECTRO-VOICE AP26øo LEVEL(dBr) Frequency Curves NSE(deg) FREQ(Rz) 25 36. m 35. Æ åutd-&ise 33 .n 29.n 8.ea 23,n 21. n LECTRO-UOICE AP26øe 2.5m I.een 28 -2,eæ -s.ew ELECTRO-UOJCE -ne,ø. 129. ø -13e.e -149. e -asø.e. -tge,ø -17B.ø -Ite.g -ISi -30. -45. LEVEL vs. FREQUENCY LEVEL(dBr) vs FREQ(Hz) ONE CHANNEL OPERATING BOTH CHANNELS OPERATING ‘iqu HEADROOM vs. FREQUENCY LEVEL + PHASE vs. FREQUENCY tea NO!SE vs. FREQUENCY
****** Page 8 ****** 15!] 7300 STEREO POWER AMPLIFIER pea CH.I CH.2 er SOURCE S04.rc• goon erminat nbai.nced So•rc• INPUT S •in—i• 2 2 NC 2 3 LINE OUTPUTS OPTIONSI Bi—in not’ t NC Dual Mode Speaker CH.I CH.2 Dual Mode peaker CH.I Bridge Output CH.2 u pu Outputs Output LOADS Option.i F use * Option.l HF C•pøcltot Compression Drlver Installation LOWS HIGHS nat• 2 not. 2 Com Sown 3 NC 1 Not. t, Not tor rung ov•r 100 tt 130m) 2. Not fcy rung over S tt 12m) FIGURE 3 Typical Input Connections 4. INSTALLATION 4A. a. b. c. d. e. f. g. h. j. Operating Cautions Do not operate the amplifier in a completely closed, unventilated housing. Do not connect the outputs of the channels in parallel. Do not connect the output terminals to a battery, power supply, or the power mains. Damage caused by such hookup is not covered by the warranty. Be careful when making connections, selecting signal sources and controlling the output level. Do not ite the input signal ground to the ground lead of an output. Ground-loop-induced oscillations may occur, 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. Use only the proper size mains fuse for the selected ac voltage. Do not connect either side of the loudspeaker cable to ground when operating the unit in bridged mode. The bridged mode is balanced to ground. Make certain that test equipment is not ground referenced when testing the unit in the bridged mode. Tampering with the circuit or repair by unauthorized personnel will void the warranty of the unit. Brld e Mode FIGURE 4 Typical Output Connections 4B. Input Connections Two conductor shielded low-impedance cable is recom- mended for input lines to the amplifier input. Pin 2 of the XLR-type connector is high pin 3 is low and pin 1 is ground. The 1/4-inch jack may be used as a low impedance input. Tip is high ring is low and the sleeve is ground. See Figure 3. High impedance lines may be connected to the amplifier inputs with a single-conductor low capacitance sheilded cable of 30 feet or less in length. A two conductor 1/4-inch plug will automatically unbalance the input. To help avoid hum or buzz in the output, be certain that all input cables ere physically separated from power wiring or power transformers. 4C. Output Connections Binding posts are provided for speaker terminations, the red post is high ( +) and the black post is low The preferred connector is a high quality dual banana plug. See Figure 4 for typical output configurations. Before making output connections, the input attenuators should be turned off (full counterclockwise), doing so will eliminate any chance of loud blasts or damage to the loudspeaker. Power loss in the speaker wire. The impedance of the speaker connecting wire would ideally be zero, so all of the amplifier output power would be delivered to the speaker load. However, the impedance of the speaker wire can become a significant percentage of the speaker impedance. Thus, part of the amplifier power is “lost” in the wire (in the form of heat) and the power delivered to the speaker system
****** Page 9 ****** 7300 STEREO POWER AMPLIFIER Impedance AWG Size 10 12 14 16 18 20 22 Resistance (ohms/ 1000 feet) 1.59 250 4.02 6.39 10.1 16.2 40 120 75 48 30 19 12 7 240 150 96 60 38 24 15 160 300 190 120 75 48 30 TABLE I — Cable Selection Chart is correspondingly reduced. Wire impedance is higher when using long wire runs and small wire sizes. Table I shows the two-wire cable (copper) lengths permissable for a number of wire sizes and speaker impedances, to avoid a loss of more than 0.5 dB. For a loss of 1 dB (basically imperceptible) lengths may be doubled. For a 2*dB loss, the lengths would be multiplied by 4.4. In general, note that the higher load impedances ailow much longer smaller-gauge wiring to be used, 4D. Grounding The chassis of the unit should be grounded. Connecting the chassis grounds of additional audio equipment to the chassis ground of the amplifier may help reduce noise and hum. 4E. Ventilation In order to offset the heat generated by the power amplifier, it is necessary to provide ample ventilation around the unit. Avoid blocking or impeding the vent slots of the chassis. Locate the unit where it is free from direct sunlight, humidity, dust or vibration to help prevent problems which might be caused by the environment. 5. OPERATION 5A. Dual/Stereo Mode: In the dual or stereo mode the channels may be operated independently. Before hook-up make sure that the mode switch is in the dual position and that the level controls are down (FCCVÅO. Connect the inputs and outputs (See Figures 3 and 4). Turn the power amp on and slowly increase level until the desired output power is obtained. If either (clip) LED illuminates, reduce the output with the input attenuators or reduce the source signal level 5B. Bridge Mode: Input connection should be made into channel 1 only. Do not make any input connections into channel two. Move the mode switch to bridge mode and make sure both level controls are down (FCCW). Connect the speaker across the two red binding posts. Channel 1 red post is high channel 2 red post is low (—). Do not make a connection Operation to either of the black binding posts, Switch power on and slowly increase amplifier channel 1 level control until the desired output power is obtained, If the clip LED indicators come on, reduce the power amp level control or the source signat level. 50. APX Crossover Option: The APX crossover is a 24 dB per octave Linkwitz-Riley filter network. There are 24 selectable frequencies from 50 Hz to 10,000 kHz CAUTION No user serviceable parts inside. Hazardous voltage and currents may be encountered within the chassis, To avoid electric shock, do not perform any servicing unless you are qualified to do so. 5D. 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 II lists the primary wire color, the terminat block (TB), and the position of the TB the wire should be located in for operation at the desired voltage. To alter the transformer primary wiring configuration use the following procedure: 1. 2. 3. 4. 5, 6. 7. 8. 9. 10. Disconnect the amplifier from the ac power source. Remove the ten screws securing the top cover. There are three screws on each side, two screws on the rear along the bottom edge, and the two innermost screws inset into the top strip on the front panel. See Figure 5 for exact screw locations. Discharge each large capacitor carefully through a 150-ohm, 2-watt resistor for at least one minute. See Figure 6. Locate the two voltage-selection terminal blocks mounted next to each other on the side of the chassis between the power transformer and the large capacitor. The transformer has six primary leads. Disconnect the primary leads of the power transformer by pulling each wire firmly to disengage it from the terminal block. Note: The primary lead colors are black, brown, white, blacWwhitel brown/white and white/black. Select the desired operating voltage on Table II and reconnect the wires accordingly. Push each wire firmly into the block until it snaps into place. Relocate the fan wires according to the wiring chart. Install the correct line fuse (values in Table III). Plug the amplifier into a variac and sweep the mains voltage from zero to full operating voltage while monitor- ing the amplifier’s dc rail voltages. The dc rail voltage should be ± 78 V dc, ± 5% at the selected primary voltage. Reinstall the top cover with the ten screws.
****** Page 10 ****** 7300 STEREO POWER AMPLIFIER Permanent Connections e TBI TB2 Factory Wiring TBI TB2 (BLK) LINE CAP (BLK) FUSE (BLK) PWR SW (BLK) PWR SW BRN LINE CAP (BLK) NEUTRAL (WH) 2 4 5 5 8 9 1 1 2 3 4 6 9 2 3 4 5 6 7 (120 V) BLK BLOWH FAN (YL) WH/BLK 100 v TBI TB2 2 3 4 5 6 7 e 9 1 BAN BRN/WH (YL) FAN WH 3RN 2 3 5 6 7 9 2 3 4 5 6 7 8 g 200 v TBI TB2 220 v TBI TB2 2 3 4 5 6 1. WHIBLK BRN 240 v TBI TB2 1 2 3 4 5 6 3 9 2 3 BLKJWH 4 FAN (YL) 5 BRNTWH 7 FAN (YL) BUK 9 WH/BLK o 2 3 BLK/V/H 4 FAN (YLI 5 6 BLK BRN/WH FAN (YL) 9 WH/BLK 2 4 5 6 8 9 1 2 3 4 5 6 9 O BLK BLK/WH FAN (YL) FAN (YL) BRNIWH BRN BLKPUH FAN (YLI BLK BRN/WH FAN (YLI WH/BLK o O DO NOT MOVE THESE WIRES, THEY ARE COMMON TO ALL PRIMARY VOLTAGES TABLE Primary Power Conversion Chart for 100-, 120-, 200-, 220-, and 240-V, 50/60-Hz Operation LOWER 2 SCREWS Line Vonage 1m Vac 120 v ac 200 Vac 220 V ac 240 V ac une Fuse, 314 Serias Normal•BIo 10 V 10 V 5 AJ250 V 5 AJ250 V 3 SCREWS eight 3 SCREWS UPPER 2 SCREWS FIGURE 5 — Top Cover Removal TABLE Ill Main Fuse Selection Guide too FIGURE 6 Capacitor Discharging
****** Page 11 ****** 7300 STEREO POWER AMPLIFIER TROUBLESHOOTING 6. 7. a. b. c. d. e. f. g. h. Be systematic; check one thing at time; check the obvious. Verify that the input connections are properly made, See Figure 3, page 4. Verify that the output connections are properly made. See Figure 3, page 4. Check input and output cables for proper wiring. Check the signal source and the load. Make sure the level controls are up. Check that the bridge mode switch is in the desired position. If there are no lights, check ac power switch and power fuse. Fuses that blow instantly on turn-on are a sign of internal distress, and you should refer the unit to a qualified service station. Troubleshooting ISchematic 6A. Protection If the amplifier goes into “protect” mode it is probably for one of the following reasons: Very Low Impedance Load or Shorted Load. Disconnect the speaker lines from the power amplifier and allow the amplifier to cool. tf the protect LEDs go out after a short period of time check the speakers or decrease the number of speakers attached to the outputs. DC on the Output of the Amplifier. Disconnect the speaker lines from the power amplifier and allow the amplifier to cool. If the protect LEDs do not go out after a short period of time it is likely that a dc voltage is on the output and that the amplifier will need servicing. SCHEMATIC r¯h7 s 9 1 Channel 4 u • 5532 1 Shown. ca.o 4 M Put u JS o 5. OJTPUT SECTION OF MO 4, CHANNEL 2 IN BEGIN IN SERIES. 3. RESESTORS OHMS. V,W, REAR BOARD 2. CAPACITORS IN MICROFARADSNOLT. RESISTORS IN OHMS, thW, WTES: UNLESS OTHERWISE SPECIFIED ret,
****** Page 12 ****** E! 7300 STEREO POWER AMPLIFIER 8. SERVICE/WARRANTY INFORMATION WARRANTY (Limited) I— Electro-Voice Professional Sound Reinforcement Electronic Components are guaranteed for two years from date of original purchase against malfunc- tion 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 finishi appearance items or malfunction due to abuse or opera- tion 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 exdusion may not apply to you. Repair by other than Electro-Voice or its authorized service agencies wil 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); Electro-Voice, Inc., 10500 W. Reno, Oklahoma City, 0K 73128 (AC1405-324-5311); and/or Electro-Voice west, 8234 Doe Avenue, Visalia, CA 93291 (AC1209-651-7777). This warranty gives you specific legal rights, and you may aiso have other rights which vary from Service/Warranty FACTORY SERVICE ADDRESS Electro-Voice, Inc. Service Department 10500 West Reno Oklahoma City, 0K 73125 AC/405-324-5311 Specifications subject to change without notice. state to state. Part Number 530990 600 Cecil Street, Buchanan, Michigan 49107, Phone (616)695-6831. TWX: 810-270-3135 8234 nne Avenue, Visalia. California 93291. Phone (209)651-7777, TLX 172 119 Electro-Voice Div., 345 Herbert Gananoque, Ontario, Canada K7G Phone , TLX 389 066 3245 Electro-Voice. Keitensttasse 5, CH.2563 IPSACH, Switzerland. Phone (41)32-51-68-33. TLX 845 934 045. FAX Ltd., 2-5-60 Izumi. Suginami.ku, Tokyo, Japan 168, Phone (81)3-325-79C0, TLX 781 232 2494 Gerrnany, Larchenstrasse 99, 6230 Frankfurt/Main 80. Germany, Phone TLX 841 413 847 Pty. Ltd., 59 Waratah street. Kirrawee. N.SW. 2232, Australia, Phone (61)2-5216322. TIX 790 267 93 Inc. 1987 LITHO IN U.sm
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