Schematic set Pro Series 8001 power amplifiers
1. 8001 Display 2. 8001 Preamp 3. 8001 Relay board 4. 8001 Power supply 5. 8001 Output module

2 R6 4.7K

R1 5.6K/1W

IC1 LM317

R14 150/0.5W

R7 4.7K

Q1 R2 10K D1 1N4148 D17 2N5551
LED 3 SIGNAL R4 100K R8 4.7K R9 4.7K R5 100K
2N5551 Q2 LED 4 SIGNAL R3 10K D2 1N4148 D18 LED 1 CLIP LED 2 CLIP

Q3 2N5551

1N4148

2N5551 Q4 C2 1uF/35V

C1 1uF/35V

D3 1N4148

D4 1N4148

1N4148 M14 15

R11 10K D5 D6

M26-48-1155

1N4004 R10 10K R12 3.3K/5W TR1 470uF/16V LM385 1.2V MAC97A RZ4 470uF/16V R16 4.7K C8 C3 C4

1N4004 R13 3.3K/5W

26-48-1155

TR2 MAC97A R22 47

R33 2.2K RR18 82

470uF/16V R34 2.2K

TEMP/DC D7

TEMP/DC D8

1N4004 C7 470uF/16V R28 4.7K R26 10K 1N4757B Z6 C9 100uF/6.3V 100uF/6.3V C10 LED 8 ACTIVE

1N4004

R23 100K R25 R27 4.7K 10K 1N4757B Z5 LED 7 ACTIVE 1 IC1 A RC4559
R24 100K D13 1N4148 D9 1N4148 D10 1N4148 D14 1N6 + 7 IC1 B RC4559

R32 2.2K Q6

2.2K D11 Q5 2N5401 R29 22

2N5401

D15 1N4148

D16 1N4148

M8 M26-48-1035 VR1 5K A VR2 5K A 3 26-48-1035
CREST AUDIO INC. 150 Florence Ave. Hawthorne, NJ 07506 Size Document Number C 21C0928 Date:

Rev Sheet

Tuesday, May 16, 2000
R8 VCC+ D1 1N4148 Q1 2N5401 R3 R2 330K 10K 2N5551 C1 100/35V Q2 MPSA75 Q3 R36 C2 47/35V D3 1N4148 D2 1N4148 D13 R32 1.5K/1% R31 3.3K 4.7K R10 100K R4 VCC22K R5 4.7K TURN ON DELAY R7 10K R11 22K IC4 NE5517AN R37 47K C16 470uF C14 470uF R6 10K 10K R9 1K R34 499/1% R35 750/1% Z1 VCC+ 1N5353

R1 15K

R65 NOTE 3
C18 0.47/250V C20 0.1uF R59 511/1% R69 NOTE 1 Q14 2N5551
1N4148 RJ2-M 26-48-1135 220K R30 VCC+ C3 0.1/50V C6 SIP1A 10K/0.2% D4 1N4148 D6 1N5 D7 1N4148 D5 1N4148 C5 470pF 30pF SIP1B 10K/0.2% 7 + IC1B NE5532AN 2 R83 47K NOTE 4 C13 10/35V

R33 22K

Z3 VCC-
1N5938 Q6 2N5551 Q10 2N5551 RR74

ATTENUATION/MUTE

R57 100

Q8 2N5551

2N5551 Q12
1 IC1A NE5532AN 14 R15 10K/1% IC3C LM339N 9 + RR41 1K/0.1% VCCR43 1K/0.1% R47 100K/0.1% R63 8.25K/1% R64 8.25K/1% R76 NOTE 2 R78 2.7K 8 R45 100K/0.1% R61 68.1/1% R67 68.1/1%

D18 SF14

SIP1C 10K/0.2%

SIP1D 10K/0.2%

C4 30pF

C7 0.1/50V

R14 10K/1% C8 2.2/5%/100V

R39 SELECTED

BALANCED INPUT/GAIN
R19 C9 2.2/5%/100V R38 VCC+ R17 4.7K 10K 10K R20 549/1% 1 IC2A RC4559 R18 2.2K CIC3B LM339N R40 SELECTED
R150K SPEAKER SIGNAL CLIP CONTROL 1 J3-M 26-48-1155 D8 1N4148 D9 1N+ 4
0.001/50V SERVO/HIGH PASS CURRENT LIMITER

SPEAKER

LIMIT MUTE

R27 2.2K D21 1N4148

VCC+ R24
1/50V VCC+ D20 NOTE R29 2.2K 5 4
R81 10K R49 2.2K R50 10K 13 IC3D LM339N + R51 1M
R22 R21 100K R82 NOTE 4 NOTE 4 VR1 D11 R23 C12

R26 1K 7 IC2B RC4559

1N1N4148 10K 1/50V

+ R25 680K

2 IC3A LM339N
VCCR28 10K D12 2N5551 Q4 1N4148 R56 2.2K

SIGNAL DETECTOR

ATTENUATOR DRIVER

NOTE 3: 750 10W ON MODELS 8001, CV601 NOTE 1: 8.2K 2W ON MODELS 8001, 7001, CV10W ON MODEL 7001 6.8K 2W ON MODELS 6001, 10W ON MODEL 6001 4.3K 2W ON MODEL 10W ON MODELS 4801, MA5850 5.6K 2W ON MODELS CC301/300 1.1K 10W ON MODEL 4601 3.3K 2W ON MODELS CV301, CC151, 10W ON MODELS CC301 NOTE 2: 27K 2W ON MODELS 8001, 7001, CV601
1K 10W ON MODELS CV301, 3301 20K 2W ON MODELS 6001, 4801, CC10W ON MODEL CC151 16K 2W ON MODEL 4601 NOTE 4: R82, R83, D20, VR1 ARE USED ON MODEL MA5850 ONLY 15K 2W ON MODELS CV301, CC151, 3301 NOTE 5: PRIOR TO 6-2-92 R65, R66 WERE 1K/10W ON MODEL CC151 CREST AUDIO INC. 150 Florence Ave. Hawthorne, NJ 07506 1.1K 10W ON MODEL 4601 Title 560 10W ON MODELS CC301 1K 10W ON MODELS CV301, CC151, 3301 NOTE 4: R82, R83, D20, VR1 ARE USED ON MODEL MA5850 ONLY Date:
CJ1-F 09-52-3172 D19 SF14

R79 11K/1%/1W

VCC D17 1N4148 R44 1K/0.1%

R80 549/1%

R42 1K/0.1% 6 7

R48 100K/0.1%

R72 100

R77 NOTE 2

100K/0.1% R58 100

R62 68.1/1%

R68 68.1/1%

Q9 2N5401

2N5401 Q13 R75 47
2N5401 R55 2.2K VCC+ 2N5401 Q5 R53 100K D14 1N4148 D15 1N4148 R54 1M C15 VCCZ2 1N5353 470uF VCCC17 470uF R66 NOTE 3 Z4 1N5938 C21 0.1uF C19 R60 511/1% R70 NOTE 1 Q7

Q11 2N5401

Q15 2N5401

0.47/250V

R52 100K

CLIP DETECTOR

AMPLIFIER FRONT END/IC POWER SUPPLY
REV NOTES 7/15/93 (1) DELETE R12
PRO-LINE PREAMP/FRONT END Size C Document Number 21C1124-02 Wednesday, May 17, 2000 Sheet

Rev of 0

J6A-F 1 2

L1 3uH TO CH.A

R3 TO SURGE BOARD 1/10W R1 10/10W D1 C1 D7 1N4004 J6B-F

CH.A OUT

RL1 FLR264

0.047/630V

L2 3uH TO CH.B
R4 CH.B OUT TO SURGE BOARD R2 10/10W RL2 FLR264 D2 C2 0.047/630V D5 1N4004 D4 1N4004 1N4004 1N4004 NOTE: J8 IS 4 PIN HEADER ON EARLY PRODUCTION D3
R7 3.3K/5W D6 1N4004 1N5938 C4 2.2/35V Z1 +33 V. GROUND CH.B CH.A AC IN

C3 1.5/250V

J8-F 5

CREST AUDIO INC.

150 Florence Ave. Hawthorne, NJ 07506 Title 8001 RELAY PCB Size A Date:
Document Number 21A0895-00 Tuesday, May 16, 2000

Rev 00 Sheet 1 of 1

+135 CH.A
SW1 AC IN CAMP AC IN +67 CH.B BR 1 50A/400V C5 35,000/75V BR 2 50A/400V C7 35,000/75V C2 0.15/400V T1 C9 35,000/75V -67 CH.A +67 CH.A 0.15/400V C3 35,000/75V

+135 CH.B

-67 CH.B -135 CH.A -135 CH.B

MUTE SUPPLY AC OUT

TO FAN TO FAN

CREST AUDIO

HAWTHORNE, NJ 07506 Title 8001 POWER SUPPLY Size A Date:
Document Number 21A0947 Tuesday, May 16, 2000

Rev Sheet 0 of

PROFESSIONAL POWER AMPLIFIERS
Clip/Limit Signal Temp/DC
-6 -10 -15 -30 -80 -1 0dB -3
7301 Professional Power Amplifier
10004 Professional Power Amplifier

Active

-10 -15 -30 -80

-1 0dB

Clip/Limit Signal Temp/DC Active
-6 -6 -3 -10 -15 -1 0dB -30 -80 -1 0dB -3 -10 -15 -30 -80 -1 0dB -6 -3
7001 Professional Power Amplifier

-6 -10 -15 -3

-10 -15 -1 0dB -30 -80

-30 -80

10001 Professional Power Amplifier
6001 Professional Power Amplifier

Clip/Limit

Signal

Temp/DC Active

4801 Professional Power Amplifier
9001 Professional Power Amplifier
4601 Professional Power Amplifier

Signal Temp/DC Active

-10 -15
-6 -3 -10 -15 -1 0dB -30 -80
3301 Professional Power Amplifier 8001 Professional Power Amplifier
-6 -10 -3 -10 -15 -1 0dB -30 -80 -1 0dB -6 -3
MA7120 Professional Power Amplifier

-15 -30 -80

-6 -10 -3

-15 -30 -80 -1 0dB

MA9130
Professional Power Amplifier
-6 -6 -3 -10 -15 -1 0dB -30 -80 -1 0dB -3 -10
MA5850 Professional Power Amplifier

-15 -30

OWNERS MANUAL
Including MA Series Amplifiers

Important Precautions

This symbol is used to alert the operator to follow important operating procedures and precautions detailed in documentation.
10. Power down & disconnect units from mains voltage before making connections. 11. Never hold a power switch in the ON position if it wont stay there itself! 12. Do not use the unit near stoves, heat registers, radiators, or other heat producing devices. 13. Do not block fan intake or exhaust ports. Do not operate equipment on a surface or in an environment which may impede the normal flow of air around the unit, such as a bed, rug, weathersheet, carpet, or completely enclosed rack. If the unit is used in an extremely dusty or smoky environment, the unit should be periodically blown free of foreign matter. 14. Do not remove the cover. Removing the cover will expose you to potentially dangerous voltages. There are no user serviceable parts inside. 15. Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment! 16. Do not drive the inputs with a signal level greater than that required to drive equipment to full output. 17. Do not connect the inputs / outputs of amplifiers or consoles to any other voltage source, such as a battery, mains source, or power supply, regardless of whether the amplifier or console is turned on or off. 18. Do not run the output of any amplifier channel back into another channels input. Do not parallel- or seriesconnect an amplifier output with any other amplifier output. Crest Audio is not responsible for damage to loudspeakers for any reason. 19. Do not ground any + (hot) terminal. Never connect a + (hot) output to ground or to another + (hot) output!
20. Non-use periods. The power cord of equipment should be unplugged from the outlet when left unused for a long period of time. 21. Service Information E q u i p m e n t should be serviced by qualified service personnel when: A. The power supply cord or the plug has been damaged; B. Objects have fallen, or liquid has been spilled into the equipment; C. The equipment has been exposed to rain; D. The equipment does not appear to operate normally, or exhibits a marked change in performance; E. The equipment has been dropped, or the enclosure damaged. 22. To obtain service, contact your nearest Crest Audio Service Center, Distributor, Dealer, or Crest Audio at 201.909.8700 (USA).

This symbol is used to warn operators that uninsulated dangerous voltages are present within the equipment enclosure that may pose a risk of electric shock.
1. Save the carton and packing material even if the equipment has arrived in good condition. Should you ever need to ship the unit, use only the original factory packing. 2. Read all documentation before operating your equipment. Retain all documentation for future reference. 3. Follow all instructions printed on unit chassis for proper operation. 4. Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. 5. Make sure power outlets conform to the power requirements listed on the back of the unit. 6. Do not use the unit if the electrical power cord is frayed or broken. The power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords and plugs, convenience receptacles, and the point where they exit from the appliance. 7. Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. 8. Mains voltage must be correct and the same as that printed on the rear of the unit. Damage caused by connection to improper AC voltage is not covered by any warranty. 9. Have gain controls on amplifiers turned down during power-up to prevent speaker damage if there are high signal levels at the inputs.
All Professional Series power amplifier models are UL LISTED, except for: MA5850 MA7120 MA9130
Power Amplifier Owners Manual
Table of Contents Introduction. 2 Unpacking. 2 Mounting. 2 Cooling Requirements. 3 Operating Precautions. 3 Crest Audio Model 7301 Power Amplifier. 3 Crest Audio Model 10004 Power Amplifier. 3 Models 3301, 4801, 6001 Features. 4 Model 4601 Features. 4 Model 7001 Features. 5 Model 7301 Features. 5 Model 8001 Features. 6 Model 9001 Features. 7 Model 10001 Features. 8 Model 10004 Features. 9 Connecting Inputs. 10 Connecting Outputs. 10 Crest Audio Octal Sockets. 10 NexSys. 10 Connecting Power. 11 Operation Modes. 11 Bridging Precautions. 12 Switches and Controls. 12 Indicators. 13 Protection Features. 13 Speaker Protection. 15 Amplifier Maintenance and User Responsibility. 15 Service/Warranty Information. 15 Professional Series Block Diagram. Appendix A General Amplifier Specifications. Appendix B Wire Gauge Charts. Appendix C Meyer-Compatible Power Amplifiers. Appendix D
Crest Audio Pro Series Power Amplifiers

Page 1

Introduction
Congratulations.on your purchase of a Crest Audio Professional Series power amplifier. Designed for years of reliable, flawless operation under rigorous use. These power amplifiers offer the sonic superiority and unsurpassed reliability for which Crest Audio is famous, while remaining surprisingly compact. Advanced technology and extensive protection circuitry allow operation with greater efficiency into difficult loads and power conditions. All Professional Series amplifiers are fully compatible with Crest Audios Octal Socket Accessories and the NexSys computer-controlled audio system. The IGM (Instantaneous Gain Modulation) circuit ensures trouble-free operation into loads as low as 2. The clip limiting circuits protect drivers and ensure that sonic integrity is maintained, even in extreme overload conditions. Crest Audios high-efficiency design uses tunnel-cooled heatsinks and variable speed DC fans. This cooling topology maintains a lower overall operating temperature, resulting in longer output transistor life. Model 9001, 10001, and 10004 power amplifiers use Crest Audios innovative Power Density circuitry. Although the Crest Audio Professional Series amplifiers are quite simple to operate, and are housed in ultra-strong steel chassis, improper use can be dangerous. Some of these models are very high-powered amplifiers that can put out high voltages and sizable currents at frequencies up to 30 kHz. Always use safe operating techniques with these amplifiers. FOR YOUR SAFETY, READ THE IMPORTANT PRECAUTIONS SECTION , AS WELL AS INPUT, OUTPUT, AND POWER CONNECTION SECTIONS.

USA ONLY MODEL # 8001 MAXIMUM INPUT CURRENT @ 120V, 60Hz 30 AMPS OUTPUT POWER IN WATTS PER CHANNEL, 2 1400W + OUT B -+ OUT B --

SIGNAL GROUND LIFT

BRIDGE
OUTPUT - CLASS 1 WIRING MAY BE USED
STEREO Designed & manufactured in the USA by:
1-Front Panel Channel Clip/Limit, Signal, Temp/DC, and Active LEDs. 2-Combination Circuit Breaker/Power Switch. 3-Heated Air Exhaust Grill. 4-Mode Select Switch. 5-XLR Input Connectors. 6-Crest Audio Octal Socket Accessory Connectors. 7-Channel A & B Attenuators. 8-Five-Way Output Binding Post Connectors. 9-Signal Ground Lift Barrier Strip.

Page 6

Model 9001 Features

PARALLEL BRIDGE

MODEL 9001 MAXIMUM OUTPUT POWER PER CHANNEL WATTS WATTS

PUSH IN

STEREO
DO NOT OPERATE WITHOUT THIS PROTECTIVE COVER

-BRIDGE + + OUT B --

NEXSYS OUTPUT SAMPLE
1-Front Panel Channel Clip/Limit, Signal, Temp/DC, and Active LEDs. 2-Combination Circuit Breaker/Power Switch. 3-Heated Air Exhaust Grill. 4-XLR Input Connectors. 5-Air Intake/Fan Filter. 6-Channel Attenuators. 7-Mode Select Switch 8-Crest Audio Octal Socket Accessory Connectors. 9-Signal Ground Lift Barrier Strip. 10-Single-Screw Solderless Output Connectors. 11-NexSys Output Sample Connector

Page 7

Model 10001 Features

AC MAINS-INPUT CH. B

AC MAINS-INPUT CH. A
1-Front Panel Channel Clip/Limit, Signal, Temp/DC, and Active LEDs. 2-Combination Circuit Breaker/Power Switch. 3-Heated Air Exhaust Grill. 4-Single-Screw Solderless Output Connectors. 5-Channel Attenuators. 6-Air Intake/Fan Filter. 7-Crest Audio Octal Socket Accessory Connectors. 8-XLR Input Connectors. 9-Signal Ground Lift Barrier Strip. 10-Mode Select Switch 11-NexSys Output Sample Connector

Page 8

Model 10004 Features
-6 -10 -15 -30 -80 -1 0dB -3 -10 -15 -30 -80 -1 0dB -6 -3 -10 -15 -30 -80 -6
-6 -3 -10 -15 -1 0dB -30 -80 -1 0dB -3

-OUT C +

+ OUT D -PARALLEL STEREO
+ SIGNAL OUT B -GROUND LIFT

PARALLEL STEREO

AC MAINS-INPUT CH. C & D
AC MAINS-INPUT CH. A & B
1-Front Panel Channel Clip/Limit, Signal, Temp/DC, and Active LEDs. 2-Combination Circuit Breaker/Power Switches. 3-Heated Air Exhaust Grill. 4-Five-Way Output Binding Post Connectors. 5-Channel Attenuators. 6-Crest Audio Octal Socket Accessory Connectors. 7-XLR input connectors. 8-Air Intake/Fan Filter. 9-Signal Ground Lift Barrier Strip. 10-NexSys Output Sample Connector. 11-Mode Select Switch

Page 9

Connecting Inputs
Input connections are made via the 3-pin XLR connectors (pin 3+) on the rear panel of the amplifier. The inputs are actively balanced. Pinout and polarity of connection cables should be configured as shown at the right. The input overload point is high enough to accept the maximum output level of virtually any signal source. All models have two input connections; the exception being Model 10004, which has four.

Ground ( ) Positive (+) Negative (--)

Connecting Outputs

On the models 9001 and 10001, speaker cables must be connected to the single screw solderless lug connectors on the back of the amplifiers. For all other models, speaker cables can be connected with banana plugs, spade lugs, or bare wire to the 5-way binding posts. On the Models 8001 and 10004, two pairs of 5-way binding posts are provided for each channel, so that paralleling of speakers is possible. Consult the Wire Gauge Chart to find a suitable wire gauge to minimize losses of power and damping factor in the cables. Note: See the section on model 7301 for pertinent output connection information.

XLR Pinouts

Never connect a hot (red) output to ground or to another hot (red) output! Always turn off the amplifier before making connections.

Octal Accessory Sockets

Professional Series amplifiers have two octal accessory sockets on the back panel that provide convenient insertion points for accessories in the signal path between the mode switch and the preamps. Some of the available Octal Socket Accessories include the Crest Audio XO-dB/Octave Crossover, LX-2.dB/Octave Crossover with Limiter, LM-1 Limiter, LM-2.2 Dual Limiter, PA-1 Precision Attenuator, CDEQ-2 Constant Directivity Horn Compensation Filter, or the TX-1 Input Isolation Transformer. To use the accessory sockets, first remove the factory-installed jumpers. The list below indicates the socket pinouts: Pin Channel A Ch. A(-) Inverting Signal Return Ground* Reserved +24VDC @ 25mA +24VDC (Regulated) Ch. A (+) Non-inverting Signal Return Ch. A (+) Non-inverting Signal Send Ch. A (-) Inverting Signal Send Channel B Ch. B (-) Inverting Signal Return Same as Ch. A* Reserved -Vcc High Voltage (Unregulated) +24VDC (Regulated) Ch. B (+) Non-inverting Signal Return Ch. B (+) Non-inverting Signal Send Ch. B (-) Inverting Signal Send

Octal Pinouts

* From input ground; reference ground for DC voltages at octal pins 4 - 5. From Ch. A (+) non-inverting input. For normal operation (not using the accessory sockets), jump Pin 1 to Pin 8 and Pin 6 to Pin 7 on both sockets (indicated by the dotted lines in Figure 7; the jumpers are set this way at the factory). To invert the input polarity, that is, to make XLR Pin 2 (+ ) and Pin 3 ( - ), remove the existing jumpers and jump Pin 1 to Pin 7 and Pin 6 to Pin 8. If the jumpers are misplaced, use solid wire; 4mm2 (metric) or No. 10 (AWG) will suffice. If the wire is too small, it will not fit snugly in the socket holes and may fall out; if it is too large, it may distort the socket contacts.

NexSys

Professional Series amplifiers are compatible with NexSys, Crest Audios dynamic hardware/software package that allows for sound system control and management from a Windows-based PC. The octal socket is used to connect between the amplifier and the NexSys supervisor via the NS-CCM-2 Control Module.

Page 10 Crest Audio Pro Series Power Amplifiers

Connecting Power

Professional Series power amplifier power requirements are rated at: a) idle b) 1/8th power (typical music conditions) c) 1/3rd power (continuous music conditions) d.) maximum rated power.
Never try to hold the power switch in the ON position if it wont stay there itself! Always turn off the amplifier before changing operating modes!
The maximum power current draw rating is limited only by the front panel circuit breaker. Consult the specifications in the Appendices section for figures on the current that each amplifier will demand. Make sure the mains voltage is correct and is the same as that printed on the rear of the amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by any warranty. Unless otherwise specified when ordered, Crest amplifiers shipped to customers are configured as follows: North America Europe Asia Australasia South America Japan 120VAC / 60Hz 230VAC / 50Hz 220VAC / 50Hz 240VAC / 50Hz 120VAC / 60Hz or 220VAC / 50Hz 100VAC / 50Hz
NOTE: Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also, as an extra precaution, have the attenuators turned down during power-up.

Operation Modes

Stereo Operation For stereo (dual channel) operation, turn the amplifier off and set the mode select switch to the stereo position. In this mode, both channels operate independently of each other, with their input attenuators controlling their respective levels. Thus, a signal at Channel As input produces an amplified signal at Channel As output, while a signal at Channel Bs input produces an amplified signal at Channel Bs output. For models 9001 and 10004, the recommended minimum nominal load impedance for stereo or parallel operation is 2 per channel. For model 10001, the minimum is 1 ohm per channel. Note: The Model 7301 has no mode select switch; it always operates as a dual-channel amplifier. Model 10004 has two mode select switches, one for channels A/B, and one for channels C/D. Parallel Operation For parallel (dual-channel/single input) operation, turn the amplifier off and set the mode switch in the parallel position; both amplifier channels are then driven by the signal at Channel As input. No jumper wires are needed. Output connections are the same as in the stereo mode. In the parallel mode, only Channel As input is active; Channel Bs is out-of-circuit. Both input attenuators remain active, allowing you to set different levels for each channel. Power and other general performance specifications are the same as in the stereo mode. Note: Model 7301 has no mode select switch; it always operates as a dual-channel amplifier. Bridged Mono Operation Both amplifier channels can be bridged together to make a very powerful single-channel monaural amplifier. Use extreme caution when operating in the bridged mode; potentially lethal voltage may be present at the output terminals. To bridge the amplifier, set the rear panel mode select switch to the bridge position. Apply the signal to Channel As input and connect the speakers across the hot outputs (the + binding posts of Channels A and B). Unlike the stereo and parallel modes, in which one side of each output is at ground, in the bridged mode both sides are hot. Channel As side is in phase with the input. For proper operation, both input attenuators must be in the same position. This keeps the load balanced between the channel outputs. As in the parallel mode, only Channel As input is active. Note: The Model 7301 cannot operate in bridged mono mode; it always operates as a dual-channel amplifier. See the separate section on this model. Bridged Mono Operation - Model 10004 The Model 10004 power amplifier is configured so that one or both pairs of channels can be bridged to mono. Using the rear panel mode select switches, follow the same procedures as outlined above to bridge channels A&B together and/or C&D together.

Page 11

Bridging Precautions
Use extreme caution when operating the amplifier in the bridged mode; as potentially lethal voltage may be present at the output terminals. Never ground either side of the speaker cable when the amplifier is in the bridged mode; both sides are hot. If an output patch panel is used, all connections must be isolated from each other and from the panel. The recommended minimum nominal load impedance in the bridged mode is 4 (equivalent to driving both channels at 2). Driving bridged loads of less than 4 will activate the IGM circuitry resulting in a loss of power, and may also cause a thermal overload.
Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment!

Switches & Controls

AC Power Switch/Circuit Breaker The Professional Series amplifiers have a combination AC switch/circuit breaker on the front panel. If the switch shuts off during normal use, push it back to the ON position once. If it will not stay on, the amplifier needs servicing. The 10001 has two AC switch/circuit breakers (one for each channel); the 10004 has two, one for each twin-channel amp. Input Attenuators Whenever possible, set the attenuators fully clockwise to maintain optimum system headroom. The input attenuator controls (one for channel A, one for channel B) located at the front panel adjust gain for their respective amplifier channels in all modes. See the specifications at the end of this manual for standard voltage gain and input sensitivity information. When operating a Professional Series amplifier in the bridged mode, both attenuators must be in the same position so the speaker load will be equally shared between the channels. See the section on Bridged Mono Operation for more information and precautions. Note: on the Model 7301, channel attenuators are labeled "LOWS" and "HIGHS", corresponding to the low and high frequency monitor output channels. Mode Select Switch The rear panel Mode Select Switch determines whether the amplifier is in the stereo, parallel, or bridged mono mode. Do not operate the Mode Select Switch with the amplifier powered on. See the sections on Stereo and Bridged Mono Mode for more information. Note: On the 10004 model, there are two Mode Select Switches on the rear panel. The Model 7301 power amplifier does not have a Mode Select Switch. For more information, see the Model 7301 section. Signal Ground Lift Jumper In a properly designed system (for safety and to minimize noise), the amplifier should receive its ground from the AC line cord. Whenever possible, the signal source equipment should share the same AC ground as the amplifier(s). In some cases, however, this may result in a ground loop. If this happens, remove the ground lift jumper (supplied) on the rear barrier strip. This jumper electrically connects the signal ground (Pin 2) to the chassis/AC ground (Pin 1). If the jumper is removed, the signal ground is lifted and completely isolated from the chassis/AC ground. Do not remove the jumper if the amplifier and the signal source equipment are not on the same AC ground. Note: On the Model 10004 power amplifier, there are two (2) signal ground lift jumpers.

Page 12

Indicators
Professional Series amplifiers feature four front panel LED indicators per channel: Clip/Limit, Signal, Temp/DC, and Active. These LED indicators inform the user of each channels operating status and warn of possible abnormal conditions. Clip/Limit LED A channels Clip/Limit LED will light dimly at the onset of clipping and increase in brilliance as clipping becomes more severe, staying on until the clipping ceases. If the LEDs are flashing quickly and intermittently, the channel is just at the clip threshold, while a steady, bright glow means the amp is clip limiting, or reducing gain to prevent severely clipped waveforms reaching the loudspeakers. See the Clip Limiting section for more information. Signal LED This LED lights when its channel produces an output signal of about 4 volts RMS or more (0.1 volt or more at the input, with 0 dB attenuation and standard X40 voltage gain). It is useful in determining whether a signal is reaching and being amplified by the amplifier. Temp/DC LED The Temp/DC LED lights to indicate that the channels output relay is open, disconnecting the speaker(s) for any of the following reasons: 1. The unit was just powered up and is in the turn-on delay mode. 2. The amplifier senses a DC voltage at its output. 3. The channel has overheated. Active LED The Active LED indicates that its channels output relay is closed and the channel is operational. It lights under normal operation and remains on even when the channel is in clip limiting or IGM gain reduction. These are protection features which leave the output relay closed. If the Active LED goes off, there is no signal at the module output point.

Protection Features

Professional Series amplifiers incorporate several circuits to protect both themselves and loudspeakers under virtually any situation. Crest Audio has attempted to make the amplifiers as foolproof as possible by making them immune to short and open circuits, mismatched loads, DC voltage, and overheating. If a channel goes into the clip limiting or IGM gain reduction mode, the speaker load remains connected, but clipping percentage or output power are instantly reduced. When a problem occurs that causes a channel to go into a protection mode, the Temp/DC LED for that channel will glow. DC voltage on the output, excessive subsonic frequencies, or thermal overload will cause the channels output relay to disconnect the speaker load until the problem is corrected or the amplifier cools down. Clip Limiting Any time a channel is driven into hard, continuous clipping, the clip limiter circuit will automatically reduce the channel gain to a level just slightly into clipping, guarding the speakers against the damaging high power continuous square waves that may be produced. Situations that may activate the clip limiter include uncontrolled feedback, oscillations, or an improper equipment setting or malfunction upstream from the amplifier. Normal program transients will not trigger the clip limiter; only steady, excessive clipping will. The Clip/Limit LED will glow brightly and continuously when limiting occurs. IGM Impedance Sensing Professional Series amplifiers feature innovative circuitry that allows safe operation into any load. When an amplifier sees a load that overstresses the output stage, the Instantaneous Gain Modulation (IGM) circuit adjusts the channel gain to a safe level. This method of output stage protection is far superior to conventional, brute force type limiting found on other amplifiers. Like the clip limiter, the IGM circuit is sonically transparent in normal use and unobtrusive when activated.

Page 13

Thermal Protection The internal fan(s) will keep the amplifier operating well within its intended temperature range under all normal conditions. If a channels heat sink temperature reaches 75C, (85C for Models 7001 and 8001) which may indicate an obstructed air supply, clogged air filter, etc., that channel will independently protect itself by disconnecting its load and shutting down until it has cooled to 72C ( 82C for Models 7001 and 8001). During this time, the channels DC/Temp LED will light. If the power transformer gets too hot, its thermal sensing circuit will disconnect both channel outputs. Normal operation will resume automatically once the transformer cools to a safe level. During this time, the Active LED will extinguish, the Temp/DC and Clip/Limit LEDs will stay lit, and the cooling fan will stay running. Short Circuit If an output is shorted, the IGM and thermal circuits will automatically protect the amplifier. The IGM circuit senses the short circuit as an extremely stressful load condition and attenuates the signal, protecting the channels output transistors from overcurrent stress. If the short circuit remains, the channel will eventually thermally protect itself by disconnecting the load. DC Voltage Protection If an amplifier channel detects DC voltage at its output terminals, its output relay will immediately open to prevent loudspeaker damage. The channels Temp/DC LED will light. Subsonic Frequencies The Professional Series amplifiers have built-in 12 dB per octave high-pass filtering, cornered at 8 Hz, to provide subsonic frequency protection for each channel. In addition, a channels output relay will open if excessive subsonic energy appears at the output. Turn-On/Turn-Off Protection At power-up, the amplifier stays in the protect mode, with outputs disconnected, for about 3 seconds while the power supplies charge and stabilize. While the output relays are open, the Temp/DC LEDs light. When power is removed, the speaker loads immediately disconnect so that no thumps or pops are heard. AutoRamp Signal Control Whenever a Professional Series amplifier powers up or comes out of a protect mode, the AutoRamp circuit activates. While the speakers are disconnected, the AutoRamp circuit fully attenuates the signal. After the output relay closes, the signal slowly and gradually raises up to its set level. The AutoRamp Signal Control circuit has some important advantages over the conventional instant-on circuits: 1. If a signal is present during power-up (or when coming out of protect), the speakers are spared a sudden, potentially damaging burst of audio power. 2. Because the gain is reduced until after the output relay closes, no arcing occurs at the contacts, thereby extending their useful life.

Speaker Protection

Page 14
All loudspeakers have electrical, thermal, and physical limits which must be observed to prevent damage or failure. Too much power, low frequencies applied to high frequency drivers, severely clipped waveforms, and DC voltage can all be fatal to cone and compression drivers. The Crest Audio Professional Series amplifiers automatically protect speakers from DC voltages and subsonic signals. For more information, see the section on Protection Features. Mid- and high-frequency speakers, especially compression drivers, are highly susceptible to damage from overpowering, clipped waveforms, or frequencies below their rated passband. Be extremely careful that the low and mid bands of an electronic crossover are connected to the correct amplifiers and drivers and not accidentally connected to those for a higher frequency band. The amplifiers clipping point is its maximum peak output power, and some of the higher power Crest Audio Professional Series amplifiers can deliver more power than many speakers can safely handle. Be sure the peak power capability of the amplifier is not excessive for your speaker system. To ensure that the speakers never receive excessive power and that the amplifier never clips, use a properly adjusted external limiter (or a compressor with a ratio of 10:1 or higher) to control power output; in systems with active electronic crossovers, use one for each frequency band. The clip limiter will automatically limit the duration of squared-off, continuous waveforms applied to the speakers. The amplifier will, however, allow normal musical transient bursts to pass. Of course, when the amplifier does clip, it is right at its maximum output power. Some speaker systems are packaged with processors that have power limiting circuits and should not require additional external limiting. Fuses may also be used to limit power to speaker drivers, although as current-limiting rather than voltage-limiting devices, they are an imperfect solution, and as the weakest links, they only limit once before needing replacement. Some poor quality fuses have a significant series resistance that could degrade the amplifiers damping of the speakers motion and may even deteriorate the systems sound quality. If you elect to use fuses, check with the speaker manufacturer to determine the proper current rating and time lag required. Do not drive any low-frequency speaker enclosure with frequencies lower than its own tuned frequency; the reduced acoustical damping could cause a ported speaker to bottom out even at moderate power. Consult the speaker system specifications to determine its frequency limits.

Appendix B

Appendix B - General Amplifier Specifications (Model 4601)
1kHz, <0.012% THD+N 20Hz-20kHz, <0.05% THD+N 350W 300W 485W 425W 925W 825W 59V 83.4V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.012% <0.1% 400:1 >60 dB 1.03V RMS X40 >20k > -100 dB > -60dB AB Female XLR (pin 3+), Octal Socket 5-way output binding posts 40,800 F 120V, 60Hz 1.1A 7.3A 11.1A 18.0A 2576 BTU/hr 3443 BTU/hr Rear to front tunnel heatsink, 2 variable speed DC fans Front panel: 2 attenuators, circuit breaker/power switch; Rear panel: mode switch, signal ground lift jumper. Clip/Limit, Signal, Temp/DC, Active 16 ga. single piece steel chassis,.187" (5mm) alum. front panel 3.5"x19"x15" (16" to rear ears) 89mm x 483mm x 381mm (406mm to rear ears) 48.0 lbs (21.79 kg.), 43.0 lbs (19.52 kg.) 5 years, parts and labor
8 Stereo Power 4 Stereo Power 8 Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.3dB, 1W/8) Power Bandwidth (rated power at 4, 1% THD+N) Protection Circuitry THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1kHz) Input Sensitivity (rated power at 4 ) Voltage Gain Input Impedance (balanced) Hum and Noise (A weighted, full power, 4) Crosstalk (A weighted, full power, 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Standard Power Supply (USA) Idle Current Draw (120V) 1/8 Power Curr. Draw (typical music, 120V/4) 1/3 Power Curr. Draw (continuous music, 120V/4) Max Curr. Draw (circuit breaker rating, 120V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls LED Indicators (per channel) Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty
Appendix B - General Amplifier Specifications (Model 4801)
8 Stereo Power 4 Stereo Power 8 Bridged Mono Power 2Stereo Power 4 Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.3dB, 1W/8) Power Bandwidth (rated power at 4, 1% THD+N) Protection Circuitry THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1kHz) Input Sensitivity (rated power at 4 ) Voltage Gain Input Impedance (balanced) Hum and Noise (A weighted, full power, 4) Crosstalk (A weighted, full power, 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Standard Power Supply (120V) Idle Current Draw (120V) 1/8 Power Curr. Draw (typical music, 120V/4) 1/3 Power Curr. Draw (continuous music, 120V/4) Max Curr. Draw (circuit breaker rating, 120V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls LED Indicators (per channel) Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty

Appendix B - General Amplifier Specifications (Model 8001)
1kHz, <0.025% THD+N 20Hz-20kHz, <0.1% THD+N 750W 720W 1225W 1200W 2450W 2250W 1400W 1400W 2800W 2800W 91V 129V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.025% <0.1% 400:1 >60 dB 1.75V RMS X40 >20k > -100 dB > -60dB H Female XLR (pin 3+), Octal Socket 2 pair 5-way output binding posts 70,000 F 120V, 60Hz 1.6A 10.8A 21.8A 37.5A 3380 BTU/hr 6140 BTU/hr Rear to front tunnel heatsink, 105 CFM AC fan, 2-speed optional. Front panel: 2 attenuators, circuit breaker/power switch; Rear panel: mode switch, signal ground lift jumper. Clip/Limit, Signal, Temp/DC, Active 14 ga. steel chassis, 0.25" (6mm) aluminum front panel 5.25"x19"x15" (16" to rear ears) 133mm x 483mm x 381mm (406mm to rear ears) 85 lbs. (38.6 kg.), 80 lbs. (36.0 kg.) 5 years, parts and labor
8 Stereo Power 4 Stereo Power 8 Bridged Mono Power 2Stereo Power 4 Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.3dB, 1W/8) Power Bandwidth (rated power at 4, 1% THD+N) Protection Circuitry THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1kHz) Input Sensitivity (rated power at 4 ) Voltage Gain Input Impedance (balanced) Hum and Noise (A weighted, full power, 4) Crosstalk (A weighted, full power, 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Standard Power Supply (USA) Idle Current Draw (120V) 1/8 Power Curr. Draw (typical music, 120V/4) 1/3 Power Curr. Draw (continuous music, 120V/4) Max Curr. Draw (circuit breaker rating, 120V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls LED Indicators (per channel) Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty
Appendix B - General Amplifier Specifications (Model 9001)
1kHz, <0.02% THD+N 20Hz-20kHz, <0.1% THD+N 1200W 1100W 2200W 2050W 4400W 4100W 3300W 3000W 6600W 6000W 114V 161V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.02% 0.05% 200:1 >60 dB 2.26V RMS X40 >20k > -100 dB > -60dB H Female XLR Input (pin 3+), Octal Socket. Single screw solderless copper output lugs. 46,000 F 120V, 60Hz 2.0A 16.2A 30.0A 65.0A 3850 BTU/hr 7700 BTU/hr Rear to front tunnel heatsink, variable speed DC fan, 140 CFM max. Front panel: 2 attenuators, circuit breaker/power switch; Rear panel: mode switch, signal ground lift jumper. Clip/Limit, Signal, Temp/DC, Active 12 ga. steel chassis, 0.187" (5mm) aluminum front panel 5 1/4" x 19" x 19.5", 133mm x 483mm x 496mm 115 lbs (52.21 kg.), 110 lbs (49.94 kg.) 5 years, parts and labor

Appendix B - General Amplifier Specifications (Model 10001)
2 Stereo Power 1 Stereo Power 4 Bridged Mono Power 2 Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.3dB, 1W/8) Power Bandwidth (rated power at 4, 1% THD+N) Protection Circuitry THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1kHz) Input Sensitivity (rated power at 4 ) Voltage Gain Input Impedance (balanced) Hum and Noise (A weighted, full power, 4) Crosstalk (A weighted, full power, 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Power Supply (factory configured) Idle Current Draw (120V) 1/8 Power Curr. Draw (typical music, 120V/4) 1/3 Power Curr. Draw (continuous music, 120V/4) Max Curr. Draw (circuit breaker rating, 120V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls LED Indicators (per channel) Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty
20Hz-20kHz, <0.1% THD+N Typical Music Prog. Material 3500W 5000W 5000W 7500W 7000W 10,000W 10,000W 15,000W 105V 150V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2 dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.02% 0.05% 580:1 >60 dB 2.24V RMS X40 >20k > -100 dB > -60dB H Female XLR Input (pin 3+), Octal Socket Single screw solderless copper output lugs. 29,200 F 100V240V, 5060Hz 2.0A per line cord 13.0A per line cord 25.0A per line cord 35.6A per line cord 4450 BTU/hr 7908 BTU/hr Rear to front tunnel, variable speed DC fan, 235 CFM max. Front panel: 2 attenuators, circuit breaker/power switch; Rear panel: mode switch, signal ground lift jumper. Clip/Limit, Signal, Temp/DC, Active 12 ga. steel chassis, 0.075" (1.9mm) aluminum front panel 7" x 19" x 20.5" (19.5" to end of rear ears), 178mm x 483mm x 521mm (496mm to back of rear ears) 145 lbs (65.83 kg.), 137 lbs (62.20 kg.) 5 years, parts and labor
Appendix B - General Amplifier Specifications (Model 10004)
1kHz, <0.02% THD+N 20Hz-20kHz, <0.1% THD+N 750W 720W 1225W 1200W 2450W 2400W 1400W 1400W 2800W 2800W 91V 137V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.02% 0.06% 600:1 >60 dB 1.7V RMS X40 >20k > -100 dB > -60dB H Female XLR (pin 3+), Octal Socket 5-way output binding posts 168,000 F per channel 100V240V, 5060Hz 1.6A per line cord 10.8A per line cord 21.8A per line cord 35.6A per line cord 3380 BTU/hr 6140 BTU/hr Rear to front tunnel, 2 speed DC fan, 235 CFM max Front panel: 4 attenuators, 2 circuit breaker /power switches; Rear panel: 2 mode switches, signal ground lift jumper Clip/Limit, Signal, Temp/DC, Active 12 ga. steel chassis,.093" (2.5mm) aluminum front panel 7" x 19" x 20.5" (19.5" to end of rear ears); 178mm x 483mm x 521mm (496mm to back of rear ears) 145 lbs (65.83 kg.), 137 lbs (62.20 kg.) 5 years, parts and labor

8 Stereo Power (x4 ch.) 4 Stereo Power (x4 ch.) 8 Bridged Mono Power (x2 ch.) 2Stereo Power (x4 ch.) 4 Bridged Mono Power (x2 ch.) Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.3dB, 1W/8) Power Bandwidth (rated power at 4, 1% THD+N) Protection Circuitry THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1kHz) Input Sensitivity (rated power at 4 ) Voltage Gain Input Impedance (balanced) Hum and Noise (A weighted, full power, 4) Crosstalk (A weighted, full power, 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Power Supply (factory configured) Idle Current Draw (120V) 1/8 Power Curr. Draw (typical music, 120V/4) 1/3 Power Curr. Draw (continuous music, 120V/4) Max Curr. Draw (circuit breaker rating, 120V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls LED Indicators (per channel) Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty
Appendix C - Wire Gauge Charts
Stranded Cable Lgth. (ft.) 5 Wire Gauge (AWG) Power Loss (8 ohm load) 0.81% 0.51 0.32 0.20 0.128 1.61% 1.02 0.64 0.40 0.25 6.2% 4.0 2.5 1.60 1.01 0.60 11.9% 7.7 5.0 3.2 2.0 1.20 Power Loss (8 ohm load) 2.9% 1.74 1.16 0.58 0.35 0.22 4.3% 2.9 1.45 0.87 0.55 0.37 8.24% 5.6 2.9 1.74 1.09 0.73 15.5% 8.2 5.1 3.2 2.2 1.31 Power Loss (4 ohm load) 1.61% 1.02 0.64 0.40 0.25 3.2% 2.0 1.28 0.80 0.51 11.9% 7.7 5.0 3.2 2.0 1.20 22% 14.6 9.6 6.2 4.0 2.4 Power Loss (4 ohm load) 5.6% 3.4 2.3 1.16 0.70 0.44 8.2% 5.6 2.9 1.74 1.09 0.73 15.5% 10.8 5.6 2.9 1.74 1.09 25% 15.5 9.8 6.3 4.3 2.6 Power Loss (2 ohm load) 3.2% 2.0 1.28 0.80 0.51 6.2% 4.0 2.5 1.60 1.01 22% 14.6 9.6 6.2 4.0 2.4 37% 26 17.8 11.8 7.7 4.7 Power Loss (2 ohm load) 10.8% 6.7 4.5 2.3 1.39 0.87 15.5% 10.8 5.6 3.4 2.2 1.45 28% 19.9 10.8 6.7 4.3 2.9 45% 28 18.2 12.0 8.2 5.1

Appendix C

Wire Gauge (mm2)
Stranded Cable Lgth. (m) 2
0.3 0.5 0.75 1.5 2.0.5 0.75 1.5 2.6 0.5 0.75 1.5 2.6 0.75 1.5 2.6 10

USA, Canada, U.K., and many other countries. Power figures are watts per channel, both channels driven. Crest Audio reserves the right make improvements in manufacturing or design which may affect specifications Crest Audio specification literature is available in dow
8 Stereo Power 4 Stereo Power 8 Bridged Mono Power 2Stereo Power 4 Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.3dB, 1W/8) Power Bandwidth (rated power at 4, 1% THD+N) Protection Circuitry
THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1kHz) Input Sensitivity (rated power at 4 ) Voltage Gain Input Impedance (balanced) Hum and Noise (A weighted, full power, 4) Crosstalk (A weighted, full power, 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Power Supply (factory configured) Idle Current Draw (240V) 1/8 Power Curr. Draw (typical music, 240V/4) 1/3 Power Curr. Draw (continuous music, 240V/4) Max Curr. Draw (circuit breaker rating, 240V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls LED Indicators (per channel) Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty
1kHz, <0.025% THD+N 20Hz-20kHz, <0.1% THD+N 750W 720W 1225W 1200W 2450W 2250W 1400W 1400W 2800W 2800W 91V 129V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.025% <0.1% 400:1 >60 dB 1.75V RMS X14 (+23 dB) >20k > -100 dB > -60dB H Female XLR (pin 3+), Octal Socket 2 pair 5-way output binding posts 70,000 F 100V240V, 5060Hz 0.8A 5.4A 10.9A 19.0A 3380 BTU/hr 6140 BTU/hr Rear to front tunnel heatsink, low-noise 2-speed fan Front panel: 2 attenuators, circuit breaker/power switch; Rear panel: mode switch, signal ground lift jumper. Clip/Limit, Signal, Temp/DC, Active 14 ga. steel chassis, 0.25" (6mm) aluminum front panel 5.25"x19"x15" (16" to rear ears) 133mm x 483mm x 381mm (406mm to rear ears) 85 lbs. (38.6 kg.), 80 lbs. (36.0 kg.) 5 years, parts and labor
USA, Canada, U.K., and many other countries. Power figures are watts per channel, both channels driven. Crest Audio reserves the right k i t i f t i d i hi h ff t ifi ti C t A di ifi ti lit t i il bl i d