Crest Audio VSL 1500 - TECHNICAL, VSL 460 - TECHNICAL, VsL900, VsL 460 Technical Data Manual

PROFESSIONAL

POWER AMPLIFIERS

FEATURES

BENEFITS

SPECIFICATIONS

SPECIFICATIONS

VsL 460 VsL900 VsL1500

Output power into 8 ohm load 150W 250W 400W
at 1kHz & 0.01% THD+N

Output power into 4 ohm load 240W 450W 750W
at 1kHz & 0.01% THD+N

Output power into 2 ohm load 325W 550W 1000W
at 1kHz & 0.01% THD+N

Bridged mono power in 8 ohm 450W 900W 1500W
Bridged mono power in 4 ohm 650W 1100W 2000W
Frequency response 10Hz–65kHz, +0/-0.3dB @ 1W into 8Ω
Power bandwidth at 4 ohm 10Hz to 20kHz, @ 1% THD+N
THD+N @ 1kHz <0.02%
SMPTE IMD <0.1%
Hum + N “A” @ rated 4 ohm power - 105dB
Crosstalk “A” @ rated 4 ohm power > -60dB
Slew rate 18V/microsecond
Voltage gain standard
Input CMRR @ 1kHz > -60dB
Input impedance 20kΩ balanced, 10kΩunbalanced
Damping factor @ 100Hz >700:1 >1000:1 >1000:1
Input sensitivity 0.775V 1.0V 1.4V
Output operating class Class AB Class AB Class H
PSU reservoir capacitance 69 Joules 116 Joules 121 Joules
Mains voltage 220V AC~50Hz
AC power consumption @ idle 125W 150W 175W
AC power consumption @ 1/8 700W 1250W 1850W
AC power consumption @ max 1150W 1850W 2525W
Dimensions H5.25" xW19" xD12" xD12" xD13.25"
Net weight 33 lbs 36lbs 42lbs

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v. 1.0 11/10/97

Crest Audio Inc.

100 Eisenhower Dr., Paramus NJ 07652 USA

TEL: [phone] FAX: [phone]

http://www.crestaudio.com

Printed in USA

† Power figures are watts per channel, both channels driven, 1kHz,1% THD+N. * 3-Year Warranty with 2 additional years is Registration Card is sent to Crest Audio. (USA,UK, Canada, and
many other countries). Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification. Crest Audio specification literature is available in down­loadable PDF format; visit our website at: http://www.crestaudio.com. ©1997 Crest Audio Inc.

Absolute sonic accuracy is the hallmark of these amplifiers with
solid bass reproduction, defined to the limits of audibility thanks
to the “over-engineered power supply”, capable of delivering
ample reserves of audio current. Wide-band output devices con­figured in the most advanced version of class AB and class H cir­cuit design, assure detailed yet sparkling high frequency response.
VsL series amplifiers also feature a comprehensive protection sys­tem, yet totally transparent to the audio path. Also Crest’s unique
IGM circuit is included making it totally safe to use these ampli­fiers with load impedances as low as 2 ohm without any compro­mise in performance. For example it would be perfectly safe and
professional practice to power four 8 ohm 250 watt speakers from
each channel of a single VsL 1500 amplifier.

Crest VsL amplifiers are built with high quality
components, assuring long lasting operation.

VsL series amplifiers are built by the same factory that produces
the audio industry’s leading quality amplifiers; Crest Pro series,
used in touring sound systems all over the world all of the time.
Any internal component is selected for premium quality and test­ed for durability.

VsL amplifier printed circuit boards are machine assembled with
the highest accuracy and passed through a rigid pre-testing proce­dure before being fitted into the finished product and to assure sus­tained in-field operation receive a rigorous “hot room” cycled
burn-in, before going through a final checkout test, performed by
an automated state-of-the-art, precision audio measurement sta­tion, eliminating any possible human error in the interpretation of
critical “product quality assurance” data.

Cool power and Hot music:
The magic of Crest VsL amplifiers

Whilst for a single output device amplifier, it would be true that
the “thermal headroom” margin of a metal cased TO-3 style
power transistor is larger than its plastic encapsulated equivalent,
it is also true that modern power amplifiers use more than one pair,
and Crest amplifiers uses plastic transistors in their output stages
far in excess of competitive makers that use metal ones.

Extra transistors and their effect upon thermal headroom

This means that every power transistor in a Crest VsL amplifier
works within a much larger “safe operating area” drastically
increasing their long term reliability because of largely reduced
waste heat generated by more traditional devices.

To off-set the thermal effects of increased ambient temperatures,
the VsL design utilizes a specially designed extruded aluminum
heat-sink with super efficient dissipation characteristics, critically
placed in the airflow path of an extra large fan assuring to keep
internal temperatures of the output devices to a cool minimum,
even under the most exhausting demands for power.

Vsl Cooling Scheme

Crest VsL amplifiers let you not only hear, but
unmistakenly feel the difference in bass
response from competing products.

VsL amplifiers, like all Crest amps, are constructed around an
over-built power supply, with massive amounts of instantly avail­able energy from a large capacitor storage reservoir and custom
made high current power transformers. Mains voltage surges or
spikes are electrical conditions that are largely outside your con­trol and that’s why Crest gives you front panel mounted circuit
breakers that function as a fuse as well as being the amplifier’s
power switch. If you encounter problems of this nature, simply
flip the switch and you’re back in business without suffering pro­longed embarrassing silence.

Choosing Crest VsL amplifiers is getting the
best money can buy.

With built-in insurance through Crest’s exclusive world standard
TourClass Protection and that includes protecting your loud­speakers as well. Crest’s comprehensive protection against abuse
or failure is unmatched today with the following exclusive circuit
designs featuring preventive as well as active protection.

Preventive protection includes IGM (instant gain modulation)
allowing you to double-up on speakers without causing the ampli­fier to prematurely suffer from overload.

The VsL 1500 can supply 1000 watts per channel into 2Ω;
the competition can only supply 500 watts per channel into 4Ω.

ACL (automatic clip limiter) at the same time prevents severe dis­tortion or feedback capable of destroying your loudspeakers
because you accidentally pushed your mixer output level too high.

Active protection gives you Autoramp which guards your amplifi­er and speaker cones against damaging spikes during power-up or
down, apart from circuits that protect your amplifier from becom­ing damaged because of thermal runaway,input overload, shorted
outputs, dangerous transients or DC voltage appearing on the
amplifier’s output terminals.

Crest VsL amplifiers mean no further costly
upgrades

With Crest VsL amplifiers running your sound you can be assured
that upgrading has stopped because they are amplifiers with stay­ing power.

Warranty

VsL Series amplifiers are covered by a
unique warranty. All models are covered
for three years as standard; Crest will
extend this by two more years when the
registration card is returned. This gives five
years total coverage; confirming our confi­dence that these amplifiers will perform
reliably for many years to come.

Product features

• High efficiency “toroidal” power transformer design.

• Utilizes the latest generation of “high speed” output devices.

• “Cool rack” front-to-side air flow path driven by 2-speed DC
fan unit.

• Electronically “balanced” TRS and cascade barrier input con­nectors.

• Universal 5-way “high current” binding post output connec­tors.

• “Multi mode” operation for stereo, parallel and bridged
mono.

• Heavy gauge “ground lift” strap.

• Front panel mounted, “stepped-input” attenuators.

• Magnetic, “instant reset” mains circuit breaker/fuse.

• Front panel indicators for signal present, clip, active and pro­tect.

• Three+two, parts and labor warranty scheme available.*

Built-in protection

• Active Clip Limiter, to prevent speaker damage.

• Instantaneous Gain Modulation, to prevent over-stress of the
output devices.

• AutoRamp, to prevent damage from electrical spikes during
switch on/off.

• Thermal, management to protect the amplifier from condi­tions causing overheating.

• Protection of the amplifier caused by adverse conditions in
the output load.

• Protection of the speakers caused by adverse conditions in the
amplifier output section

8Ω 250 watts

8Ω 250 watts

250 watts 8Ω

250 watts 8Ω

Competition

8Ω 250 watts

8Ω 250 watts

8Ω 250 watts

8Ω 250 watts

250 watts 8Ω

250 watts 8Ω

250 watts 8Ω

250 watts 8Ω

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VsL POWER AMPLIFIERS

FEATURES AND BENEFITS

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The VsL series front panel indicators, attenuators and magnetic circuit breaker keep everything within sight and within reach.

Crest VsL power amplifiers give you the same unchallenged excellence of sound quality and relia­bility the world’s mega stars use. The VsL series of professional power amplifiers are specifically
designed to achieve unsurpassed sonic performance and long term reliability - from sound installations
operated with budgetary constraints.

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