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1. Save the carton and pack-

ing 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 doc-
umentation for future refer-
ence.

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, pay-
ing particular attention to
cords and plugs, conve-
nience 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 pre-
vent speaker damage if
there are high signal levels
at the inputs.

10. Power down & disconnect

units from mains voltage
before making connec-
tions.

11. Never hold a power

switch in the “ON” posi-
tion if it won’t 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 sur-
face or in an environment
which may impede the nor-
mal 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 out-

puts to oscilliscopes 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 volt-
age source, 
such as a bat-
tery, 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 chan-
nel’s input. Do not paral-
lel- or series-connect an
amplifier output with any
other amplifier output.
Acoustic is not responsible
for damage to loudspeakers
for any reason.

19. Do not ground any red

(“hot”) terminal. Never
connect a “hot” (red) out-
put to ground or to anoth-
er “hot” (red) 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

Equipment should be ser-
viced 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 nor-
mally, or exhibits a marked
change in performance;
E.

The equipment has

been dropped, or the enclo-
sure damaged.

22. To obtain service, contact

your nearest Service
Center, Distributor, Dealer,
or Crest Audio Customer
Serviece directly at:

Crest Audio Inc.

100 Eisenhower Drive

Paramus NJ 07652

tel 201.909.8700

fax 201.909.8744

http://www.crestaudio.com

Important Precautions

This symbol is used to
alert the operator to fol-
low important operating
procedures and precau-
tions detailed in docu-
mentation.

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.

Summary of Contents for VSL 1500

Page 1: ...OWNER S MANUAL PROFESSIONAL POWER AMPLIFIERS ...

Page 2: ...he 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 out puts to oscilliscopes 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 signa...

Page 3: ... Table of Contents Introduction 2 Unpacking 2 Installation Mounting 2 Front Panel Controls 2 Back Panel Controls Connections 3 Operation 4 Protection Features 5 Service Information 5 Operation Mode Drawings 6 Connection Detail Drawings 7 Technical Specifications 8 ...

Page 4: ...rt especially important in mobile sound systems Because of the cables and connectors on the rear panel a right angle or offset screwdriver or hex key will make it easier to fasten the rear mounting ears to the rails Optional rack mount handles are available from your Crest Audio authorized dealer Front Panel Controls 1 Rack Mounting Ears Two front panel mounting holes are provided on each mounting...

Page 5: ...ors For connection of balanced TRS Input Plugs A diagram showing TRS polarity is shown on drawing 4 Note Unbalanced Tip Sleeve plugs may be used with the balanced TRS connectors The ring terminal or negative input will be connected to ground internally 14 Mode Selection Switch This push button switch configures the amplifier for either Stereo or Bridged Mono operation mode Amplifiers are factory c...

Page 6: ...minimum nominal load impedance for stereo operation is 2 ohms per channel Either the 1 4 TRS inputs or the barrier strip inputs may be used Loudspeakers are connected to the red and black 5 way output binding posts for each channel Bridged Mono Mode Drawing 2 Bridged Mono Mode straps both amplifier channels together to make a very powerful single channel monaural amplifier One channel push es and ...

Page 7: ...ature grad ually 80dB to 0dB in 3 0 seconds increases gain to the attenuator setting avoiding unnecessary stress on the loudspeakers Thermal Protection If the heatsink temperature reaches an abnormally high temperature the ampli fier will protect itself by disconnecting loudspeakers and shutting down until sufficiently cooled During this time the Protect LED s will light If the power transformer g...

Page 8: ... 2 WIRING MAY BE USED Input is connected to Channel A using either a TRS connec tor or the Input Barrier Strip but not both Jumper from Channel A to Channel B for ground is not neces sary however input ground connection to Channel A must be made Either TRS or Input Barrier Strips but not both may be used for input connections to Channels A B In this dia gram bare wire has been con nected to the In...

Page 9: ...L Series Power Amplifiers Page 7 Models VsL460 VsL900 VsL1500 Tip Positive Ring Negative Sleeve Ground 4 TRS Polarity A B A B B 5 Balanced Input Connections Jumper A B A B B 6 Unbalanced Input Connections ...

Page 10: ...per channel Protect Active 14 gauge steel 5 25 x 19 x 12 133 x 483 x 305mm 38 lbs 17 3 kg 36 lbs 16 3 kg 250 Watts 450 Watts 550 Watts 900 Watts 1100 Watts 52 3V 74V 10Hz 20kHz 3dB 165kHz 20Hz 20kHz ACL IGM AutoRamp short circuit DC voltage turn on off transient current inrush sub ultrasonic input 1 0 0 05 1000 1 64dB 1 0 V X40 20kΩ 10kΩ 105 dB 60 dB AB TRS tip Barrier Strip 5 way binding posts 38...

Page 11: ...VsL Series Power Amplifiers Page 9 Models VsL460 VsL900 VsL1500 ...

Page 12: ...v 1 1 10 22 97 1997 Crest Audio C4400023 Crest Audio Inc 100 Eisenhower Dr Paramus NJ 07652 USA TEL 201 909 8700 FAX 201 909 8744 http www crestaudio com Printed in USA ...

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