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PROFESSIONAL
POWER AMPLIFIERS

Clip/Limit
7301 Professional Power Amplifier 10004 Professional Power Amplifier
Signal
Temp/DC
Active
-6 -6
-10 -3 -10 -3

-15 -15
-1 -1
-30 -30
-80 0dB -80 0dB Clip/Limit Clip/Limit
LOWS HIGHS
Signal Signal

Temp/DC Temp/DC

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

10001 Professional Power Amplifier

Clip/Limit
6001 Professional Power Amplifier
Signal
Temp/DC
Active
-6 -6
-10 -3 -10 -3

-15 -15 Clip/Limit Clip/Limit
-1 -1
-30 -30 Signal Signal
-80 0dB -80 0dB
Ch A Ch B Temp/DC Temp/DC

Active Active

-6 -6
Clip/Limit
4801 Professional Power Amplifier -10 -3 -10 -3

-15 -15
Signal -1 -1
-30 -30
Temp/DC -80
-80 0dB 0dB
Active Ch A Ch B
-6 -6
-10 -3 -10 -3

-15 -15
-1 -1
-30 -30
-80
Ch A
0dB -80
Ch B
0dB 9001 Professional Power Amplifier

Clip/Limit

Clip/Limit
4601 Professional Power Amplifier Signal

Signal Temp/DC
Temp/DC
Active
Active
-6 -6 -6 -6
-10 -3 -10 -3 -10 -3 -10 -3

-15 -15 -15 -15
-1 -1 -1 -1
-30 -30 -30 -30
-80 0dB -80 0dB -80 0dB -80 0dB
Ch A Ch B Ch A Ch B

Clip/Limit
3301 Professional Power Amplifier
Signal
8001 Professional Power Amplifier
Temp/DC
Active Clip/Limit
-6 -6
-10 -3 -10 -3
Signal
-15 -15
-1 -1 Temp/DC
-30 -30
-80 0dB -80 0dB
Ch A Ch B Active

-6 -6
-10 -3 -10 -3

Clip/Limit
MA7120 Professional Power Amplifier -15
-1
-15
-1
-30 -30
Signal -80 0dB -80 0dB
Ch A Ch B
Temp/DC
Active
-6 -6
-10 -3 -10 -3

-15 -15
-30
-1 -1 MA9130 Professional Power Amplifier
-30
-80 0dB -80 0dB
Ch A Ch B
Clip/Limit

Signal

Clip/Limit
MA5850 Professional Power Amplifier
Temp/DC
Signal
Active
Temp/DC
-6 -6
Active -10 -3 -10 -3
-6 -6
-10 -3 -10 -3
-15 -15
-1 -1
-15 -15 -30 -30
-1 -1 -80 -80
-30 -30 0dB 0dB
-80
Ch A Ch B
0dB -80 0dB
Ch A Ch B

OWNER'S MANUAL
Including MA Series Amplifiers
Important Precautions
This symbol is used to alert the oper- 10. Power down & disconnect units from 20. Non-use periods. The power cord of
ator to follow important operating pro- mains voltage before making connec- equipment should be unplugged from
cedures and precautions detailed in tions. the outlet when left unused for a long
documentation.
period of time.
11. Never hold a power switch in the
This symbol is used to warn opera-
"ON" position if it won't stay there 21. Service Information E q u i p m e n t
tors that uninsulated "dangerous volt- itself! should be serviced by qualified service
ages" are present within the equip- personnel when:
ment enclosure that may pose a risk 12. Do not use the unit near stoves, heat
of electric shock. registers, radiators, or other heat A. The power supply cord or the plug
producing devices. has been damaged;
1. Save the carton and packing material
even if the equipment has arrived in 13. Do not block fan intake or exhaust B. Objects have fallen, or liquid has
good condition. Should you ever need ports. Do not operate equipment on a been spilled into the equipment;
to ship the unit, use only the original surface or in an environment which may
impede the normal flow of air around C. The equipment has been exposed to
factory packing.
the unit, such as a bed, rug, weather- rain;
2. Read all documentation before oper- sheet, carpet, or completely enclosed D. The equipment does not appear to
ating your equipment. Retain all docu- rack. If the unit is used in an extremely operate normally, or exhibits a
mentation for future reference. dusty or smoky environment, the unit marked change in performance;
should be periodically "blown free" of
3. Follow all instructions printed on unit
foreign matter. E. The equipment has been dropped, or
chassis for proper operation.
the enclosure damaged.
14. Do not remove the cover. Removing
4. Do not spill water or other liquids
the cover will expose you to potentially 22. To obtain service, contact your nearest
into or on the unit, or operate the unit
dangerous voltages. There are no user Crest Audio Service Center, Distributor,
while standing in liquid.
serviceable parts inside. Dealer, or Crest Audio at 201.909.8700
5. Make sure power outlets conform to (USA).
15. Connecting amplifier outputs to
the power requirements listed on the
oscilloscopes or other test equipment
back of the unit.
while the amplifier is in bridged mode
6. Do not use the unit if the electrical may damage both the amplifier and test
power cord is frayed or broken. The equipment!
power supply cords should be routed so
16. Do not drive the inputs with a signal
that they are not likely to be walked on
level greater than that required to
or pinched by items placed upon or
drive equipment to full output.
against them, paying particular atten-
tion to cords and plugs, convenience 17. Do not connect the inputs / outputs of
receptacles, and the point where they All Professional Series power amplifier
amplifiers or consoles to any other
exit from the appliance. models are UL LISTED, except for:
voltage source, such as a battery, mains
source, or power supply, regardless of
7. Always operate the unit with the AC 10001
whether the amplifier or console is
ground wire connected to the electri- 10004
turned on or off.
cal system ground. Precautions should MA5850
be taken so that the means of grounding 18. Do not run the output of any amplifi- MA7120
of a piece of equipment is not defeated. er channel back into another chan- MA9130
nel's input. Do not parallel- or series-
8. Mains voltage must be correct and
connect an amplifier output with any
the same as that printed on the rear
other amplifier output. Crest Audio is
of the unit. Damage caused by connec-
not responsible for damage to loud-
tion to improper AC voltage is not cov-
speakers for any reason.
ered by any warranty.
19. Do not ground any + ("hot") termi-
9. Have gain controls on amplifiers
nal. Never connect a + ("hot") output
turned down during power-up to pre-
to ground or to another + ("hot") out-
vent speaker damage if there are high
put!
signal levels at the inputs.
Power Amplifier Owner's 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