Vs900 POWER AMPLIFIER

Product Information
The Crest Vs900 integrates cost-effective design with exceptional sonic accuracy, long-term reliability, and basic features required for a variety of professional applications. The Vs900s remarkable price/performance ratio is the result of innovative engineering and highly efficient manufacturing in Crests modern USA facilityalong with nearly two decades of leadership in professional amplifier design. However, no compromises in component selection or quality control were permitted as a shortcut to cost reductions. In every respect, the Vs900 embodies the Crest Audio tradition of roadworthy ruggedness and reliability. For example, the Vs900 includes the same TourClass protection features as found in Crests CA, CKS, CKV and CKX Series amplifiers. That means the Vs900 will endure virtually any type of mishap or system stressfrom uncontrolled upstream oscillation to extreme ambient heat or accidental shortingwithout damage to internal circuitry or connected speakers. Equally suited to permanent installation or mobile applications, the Vs900 offers a welcome balance of exceptional audio performance and overall value. Wide-Band Design - Frequency response extends from 10Hz to 20kHz (-3dB at 165kHz), ensuring powerful sub-bass performance as well as detailed, transparent high frequency response. Effective Cooling - Large, extruded aluminum heatsink and front-mounted, two-speed 4-inch fan minimize internal temperatures to prolong amplifier life. Rated for Sustained Operation into 2 Loads Front Panel Magnetic Circuit Breaker/Power Switch Eliminates need for AC line fuses. TourClass Protection Circuits ACL (Active Clip Limiting) prevents speaker damage with gentle gain reduction at clip threshold. IGM (Instantaneous Gain Modulation) monitors connected loads to detect conditions that may overstress output devices, allowing safe operation into nominal 2 impedances. AutoRamp gradually increases gain to attenuator setting level when the amplifier is turned on. TourClass also includes protection from thermal runaway, input overload, DC, short circuit, in-rush current, and turnon/turn-off transients. Rear Panel Detented Attenuators Differentially-balanced 1/4" TRS and Barrier Strip Input Connectors Five-Way Binding Post or Speakon Output Connectors (market dependent) LED Indicators for Signal Present and Clip (each channel), Active, and Protect Stereo/Bridged Mono Mode Select Switch Five Year Warranty*

Vs900 Features

Robust Over-built Power Supply - Massive filter capacitors and a high output custom transformer provide ample current for solid bass performance, even when driving low impedance loads. More Output Transistors - By using more output devices than many comparable competitive models, the Vs900 puts less stress on each device for a wider safe operating area (SOA) and longterm reliability.

Power Specifications

1kHz, 1% THD+N

8 Stereo 250W

4 Stereo 450W

2 Stereo 550W

8 Bridged 900W

4 Bridged 1100W

Figures are Watts per channel, both channels driven.
S P E C I F I C AT I O N S
8 Stereo Power 4 Stereo Power 2 Stereo Power 8 Bridged Power 4 Bridged Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0/-0.3dB, 1W/8) Power Bandwidth (Rated power at 4, 1% THD+N) TourClass Protection 250 Watts 450 Watts 550 Watts 900 Watts 1100 Watts 52.3V 148V 10Hz-20kHz, -3dB @ 165kHz 20Hz-20kHz ACL, IGM, AutoRamp, short circuit, DC voltage, turn-on/off transient, current inrush, sub/ultrasonic input. <1.0% <0.1% >1000:1 > - 64dB 1.0 V X40 >20k/>10k -105 dB > - 60 dB AB TRS (tip +) & Barrier Strip 5-way binding posts or Speakon (market dependent) 38,000 F 100V-240V, 50-60Hz 2.8A 7.2A 10.4A 15.0A 2000 BTU/hr 2900 BTU/hr Front to Side via one 110 CFM, 2-Speed AC fan Front panel: magnetic circuit breaker/power switch. Rear Panel: 2 attenuators, mode select switch. 1 Clip, 1 Signal per channel, Protect, Active 14 gauge steel 5.25" x 19" x 12" / 133 x 483 x 305mm 46 lbs. / 20.9 kg., 44 lbs. / 20.0 kg. 5 years*

Architects & Engineers Specifications
The power amplifier shall have two channels. Each channel shall deliver a minimum of 250 watts at 8 ohms, 450 watts at 4 ohms and 550 watts at 2 ohms, 1kHz, 1% THD+N. In bridged mono mode, it shall deliver 900 watts at 8 ohms and 1100 watts into 4 ohms, 1kHz, 1% THD+N The amplifier shall be front-to-side cooled, with a two-speed AC fan. The amplifier shall have circuitry to protect itself and the speaker load from output short circuits, DC voltage on outputs, and thermal overload. The amplifier shall include circuitry to gradually increase gain to attenuator setting levels when the amplifier is turned on, and circuitry for impedance sensing and active clip limiting. The amplifier shall have a voltage gain of X40 with an input sensitivity of 1.0V for rated power at 8 ohms. THD+N shall be less than 1.0% at 4, 1kHz. The hum and noise level shall be 105 dB below rated output, A weighted. SMPTE IMD shall be less than 0.1%, rated power at 8, 60Hz and 7kHz. The amplifier shall have a class AB output stage. The frequency response shall be greater than 10Hz-20kHz +0/-0.3dB, 1W/8. The amplifier shall operate at 100V-240V, 50-60 Hz AC (configured at factory). Maximum current draw shall not exceed 15 amperes at 120VAC, (circuit breaker limited), with both channels driven continuously into a 4 ohm resistor. A combination power switch/magnetic circuit breaker shall be mounted on the front panel. Front panel indicators shall include an Active LED, a Protect LED, Signal LED and a Clip LED (one per channel). Gain attenuators shall be rear panel mounted. A rear panel Bridge/Stereo mode select switch shall be provided. Rear panel input connectors shall be an actively balanced TRS (tip +), and barrier strip for each channel. Output connectors shall be Speakon or 5-way binding posts (market dependent). Rear mounting ears shall be provided. A rear-panel IEC AC mains socket or single AC mains cord having an appropriate AC plug for the intended operating voltage shall be provided (market dependent). The packaging of the amplifier shall allow for standard rack mounting without requiring space between similar units. Optional rack mount handles shall be available. Dimensions shall be 5.25" (133mm) high x 19" (483mm) wide x 12" (305mm) deep. The amplifier shall have a net weight of 44 lbs. (20.0 kg). The amplifier shall be designated the Crest Audio model Vs900.
THD+N (rated power at 4, 1kHz) SMPTE IMD (rated power at 8, 60Hz & 7kHz) Damping Factor (10-400Hz at 8) Input CMRR (1 kHz) Input Sensitivity (rated power at 8) Voltage Gain Input Impedance (balanced/unbalanced) Hum & Noise (A weighted, full power at 4) Crosstalk (A weighted, full power at 4) Class Input Connectors (per channel) Output Connectors (per channel) Filter Storage Power Supply (factory configured) Idle Current Draw (120V) 1/8 Power Curr. Draw (typical music, 120V/4) 1/3 Power Curr. Draw (continuous music, 120V/4) Max Curr. Draw (circuit breaker rating, 120V/4) Thermal Emissions (1/8 Power, 4) Thermal Emissions (1/3 Power, 4) Cooling Controls

LED Indicators Construction Dimensions (Height x Width x Depth) Gross Weight, Net Weight Warranty
Rear View, Binding Post Version

643-210

Rear View, Speakon Version (not available in North America)

643-016

Output Ch.B

+ +Output

Bridge
Designed & manufactured in the USA by: Serial Number
CLASS 2 WIRING MAY BE USED

CAUTION

RISK OF ELECTRIC SHOCK DO NOT OPEN
AVIS : RISQUE DE CHOC LECTRIQUENE PAS OUVRIR
WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. ATTENTION! POUR VITER LE RISQUE D'INCENDIE OU DE CHOC LECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU L'HUMIDIT
Crest Audio Inc. 100 Eisenhower Dr. Paramus New Jersey, 07652 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.
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

B1000025

v. 2.3 5/20/97 B1000025