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

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.

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.

9.Have gain controls on amplifiers turned down during power-up to prevent 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 outputs 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 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 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 nor-

mally, 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 [phone] fax [phone]

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

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8

	5.25"	2.25"
		57mm
	133mm

19" / 483mm

Page 2	VsL Series Power Amplifiers
	Models VsL460, VsL900, VsL1500