Crest audio VSL 900, VSL 1500, VSL 460 User Manual
PROFESSIONAL POWER AMPLIFIERS
OWNER’S MANUAL
Important Precautions
This symbol is used to
alert the operator to follow important operating
procedures and precautions detailed in documentation.
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 doc-
umentation 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 pre-
vent speaker damage if
there are high signal levels
at the inputs.
10. Power down & disconnect
units from mains voltage
before making connections.
11. Never hold a power
switch in the “ON” position 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 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 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 voltage 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 channel’s input. Do not parallel- 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) output to ground or to another “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 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 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
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
VsL Series Power Amplifiers Page 1
Models VsL460, VsL900, VsL1500
Introduction
Congratulations on your purchase of a Crest Audio power amplifier. Please
read this manual carefully (and the accompanying “Important Precautions”
pamphlet) as it contains information vital to the safe operation of your amplifier.
Your VsL Series amplifier represents a major step forward in power amplifier
technology and design. It is feature-packed and engineered for value.
All VsL Series models include advanced circuitry capable of providing outstanding reliability and sonic performance, while protection circuitry safeguards your speakers and the amp itself. Built to Crest Audio’s exacting standards from high quality components, VsL Series amplifiers are ideally suited
to the most punishing sound reinforcement applications - fixed or mobile.
Unpacking
Upon unpacking, inspect the amplifier. If you find any damage, notify your
dealer immediately. Only the consignee may institute a claim with the carrier
for damage incurred during shipping. Be sure to save the carton and all packing materials for the carrier’s inspection. It is a good idea to save the carton
and packing material even if the amplifier has arrived in good condition.
Should you ever need to ship the unit back to Crest Audio, one of its offices, or
service centers, use only the original factory packing.
Installation and Mounting
All VsL Series amplifiers are 3-rack space units that can mount in a standard
19-inch rack. Four front panel mounting holes are provided. Rear mounting
ears give additional support, 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 ear.
2. Signal LED.
Each channel has a signal LED. This LED comes on when the input signal
entering the amplifier channel is being amplified.
3. Active LED.
The green Active LED indicates the amplifier is turned on.
4. Protect LED.
If either channel is in Protect mode, this LED will light.
5. Clip LEDs.
Each channel has a clip LED. This LED comes on at clipping point, and indicates that ACL (Active Clip Limiting) is engaged.
6. Fan Intake Grill.
A 110 CFM fan mounted behind the fan intake grill draws cooling air into the
amplifier. Do not block this intake!
7. Input Attenuators.
Two front-panel input attenuators adjust level for their respective amplifier
channels. Minimum attenuation (0dB) equals maximum output. In the bridged
mode, both attenuators are used to control signal level; in addition, both must
be at the same setting
8. AC Power Switch/Circuit Breaker.
VsL 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. No fuses are
used.
9. Fan Exhaust Ports.
Heated air exits the amplifier through the fan exhaust ports, located on the
sides of the amplifier chassis. Be sure not to block these ports, especially when
rack-mounting the amplifier.
Front Panel Diagram
1
5.25"
133mm
2 3
Page 2 VsL Series Power Amplifiers
5 6 7 8
4
19" / 483mm
Models VsL460, VsL900, VsL1500
2.25"
57mm
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