Crest audio HD12 SPECIFICATIONS

POWER AMPLIFIER

HD12

Product Description

The Crest Audio HD12 professional power amplifier is designed to achieve unsurpassed sonic performance and long-term reliability–even when operating under extreme stress–in touring or fixed installation applications.

Absolute sonic accuracy is the hallmark of every Crest amplifier.

Bass is solid and defined to the limits of audibility, with ample

current reserves delivered by an “over-engineered” power supply and advanced Class H circuitry. Wide-bandwidth output devices assure detailed, transparent high frequency response. And, thanks to Crest’s exclusive IGM circuit, the HD12 will drive 2Ω loads safely without compromise in performance.

Construction and Quality Control

The HD12 is built exclusively in Crest’s own USA manufacturing facility, with internal components selected for premium quality and proven durability. Each modular subassembly is pre-tested, and the assembled HD12 receives a rigorous “hot room” burn-in before thorough final checkout on precision test equipment.

Power Specifications: Other HD Series Power Amplifiers

4Ω Stereo HD2 HD4 HD6 HD9 HD18

1kHz, .01% THD+N 250W 435W 600W 900W 1800W 20Hz-20kHz, 0.1% THD+N 200W 400W 500W 800W 1700W

HD12 Features

• Crest’s legendary “overbuilt” power supply

• Toroidal power transformer

• Latest generation of high-speed, wide-bandwidth output devices

• Twin Tunnel Cooling with back-to-front air flow

• Dual, variable speed DC fans

• Massive, extruded aluminum heat sinks

• Balanced XLR and 1/4-inch (TRS) inputs

• 5-Way binding post outputs

• Stereo/Parallel/Bridged Mono mode selector switch

• Ground lift switch

• 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 2Ω impedances.

- AutoRamp gradually increases gain to attenuator setting level when amplifier is turned on.

- TourClass also includes comprehensive thermal management, and short circuit, DC voltage, turn-on/off transient, current inrush and sub/ultrasonic input protection.

• Input sensitivity selection

• Recessed, stepped attenuators

• Front panel magnetic circuit breaker switch

• Modular construction

• Three-year warranty (parts and labor)

Protect

Clip

Active

Signal

Ch A

Protect

Clip

Active

Signal

Ch B

Power Specifications 8Ω Stereo 4Ω Stereo 2Ω Stereo 8Ω Bridged 4Ω Bridged

1kHz, 0.01% THD+N 700W 1200W 1400W 2400W 2800W 20Hz-20kHz, 0.1% THD+N 650W 1100W 1100W 2200W 2200W

-6

-10

-3

-15

-30

-80

-10

-15

-30

-80

-1

0dB

-6

-3

-1

0dB

Figures are Watts per channel, both channels driven.

HD12 POWER AMPLIFIER

SPECIFICATIONS

1kHz, 0.01% THD+N 20Hz-20kHz, 0.1% THD+N

8Ω Stereo Power 4Ω Stereo Power

2Ω Stereo Power 8Ω Bridged Mono Power 4Ω Bridged Mono Power

Max RMS Output Voltage

(each channel)

Peak Output Voltage (each channel)

Frequency Response (+0 / -0.3dB, 1W/8Ω)

Power Bandwidth (rated power at 4Ω, 1% THD+N)

TourClass®Protection

THD+N

(rated power at 4Ω, 1kHz)

SMPTE IMD (rated power at 8Ω, 60Hz & 7kHz)

Damping Factor (10-400Hz at 8Ω)

Input CMRR (1kHz)

Input Sensitivity (rated power at 8Ω )

Voltage Gain

Input Impedance (balanced/unbalanced)

Hum and Noise

(“A” weighted, full power, 4Ω)

Crosstalk (“A” weighted, full power, 4Ω)

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/4Ω)

1/3 Power Curr. Draw (continuous music, 120V/4Ω)

Max Curr. Draw (circuit breaker rating, 120V/4Ω)

Thermal Emissions (1/8 Power, 4Ω) Thermal Emissions (1/3 Power, 4Ω)

Controls

LED Indicators

(per channel)

Construction

Dimensions

(Height x Width x Depth)

Gross Weight, Net Weight

Warranty

Dealer-Configurable Gain/Sensitivity Options Factory Standard X97.5 .775V

Rear View

700W 650W 1200W 1100W 1400W 1100W 2400W 2200W 2800W 2200W 90V 126V 20Hz-20kHz, -3dB@135kHz 20Hz-20kHz, -.23dB/+.85dB ACL, IGM, AutoRamp, short circuit, DC voltage, turn-on/off transient, current inrush, sub/ultrasonic input. <0.01% <0.01% 800:1 > - 60dB

0.775V standard (see table below) X97.5 standard (see table below) >20kΩ/>10kΩ

-105dB > - 60dB

Class

H Female XLR (pin 2+, dealer configurable for pin 3+), TRS (tip+) 5-way output binding posts or Speakon connectors 140,000 µF 100V-240V, 50-60Hz

2.8A

10.5A

23.0A 30A 4750 BTU/hr 6300 BTU/hr

Cooling

Back-to-front via 2 rear panel mounted variable-speed DC fans (filters removable without tools) Front Panel: 2 attenuators Rear Panel: signal ground lift switch, mode select switch Clip/Limit, Signal, Temp/DC, Active Steel chassis, 16 gauge. Double thickness in rack ear areas.

5.25" x 19" x 18" / 133 x 483 x 457mm 72 lbs. (32.68 kg.), 67 lbs. (30.42 kg.) 3 years, parts & labor

Gain Sens

Option 1 X40 1.87V Option 2 X20 3.74V

(market dependent)

Architect’s & Engineer’s Specifications

The power amplifier shall have two channels. At 8 ohms, 20Hz 20kHz, 0.1% THD+N, it shall deliver a minimum of 650 watts per channel. At 4 ohms, 20Hz - 20kHz, 0.1% THD+N, it shall deliver a minimum of 1100 watts per channel. In bridged mono mode with an 8 ohm load, 20Hz - 20kHz, 0.1% THD+N, it shall deliver a minimum of 2200 watts. The amplifier shall have circuitry to protect itself from output short circuits, thermal overload or other adverse load conditions. The amplifier shall protect speaker loads from DC voltage on outputs. The amplifier shall have active clip limiting and impedance sensing circuitry. Output relays shall protect the speakers from amplifier failure. Two rear panel mounted variable speed DC fans (filters detachable without tools) shall provide back to front air flow through the chassis. Each channel shall have a standard (factory-set) input sensitivity of

0.775 Volts, and shall be fitted with an internal jumper which allows the gain to be altered to X20 or X40. The hum and noise level shall be 105 dB below rated output, “A” weighted.

IMD shall be less than 0.01% at rated power, 60Hz and 7kHz. The amplifier shall have a class H output stage. The fre-

quency response shall be 20Hz-20kHz, +0, -0.3dB at rated power. The amplifier will operate at 100V-240V, 50-60 Hz AC (configured at factory). Maximum current draw shall not exceed 30 amperes at 120VAC (limited by front panel breaker for bench tests). Front panel indicators shall include Active, Protect, Signal, and Clip LED’s for each channel. Front panel attenuators shall be recessed and detented. Rear panel input connectors shall be female TRS and XLR type, internally dealer-configurable for pin 2 (factory setting) or pin 3 positive. Output connectors shall be 5-way output binding posts. A ground lift switch and a Stereo/Parallel/Bridged Mono mode operation switch shall be provided. A rear-panel IEC AC mains socket (with power cord) or single AC mains cord having an appropriate AC plug for the intended operating voltage shall be provided (market dependant). The packaging of the amplifier shall allow for standard rack mounting without requiring space between similar units. Optional rack mount handles will be available. Dimensions shall be 19" (483mm) wide, 5.25" (133mm) high and 18" (457mm) deep. The amplifier shall weigh 67 lbs. (30.42 kg.) net, and shall be designated the Crest Audio model HD12 .

SMPTE

v. 1.1 5/21/97 C3400005

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR

WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT

EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU Á

L'HUMIDITÉ

+ +

A B

Power figures are watts per channel, both channels driven. Crest Audio reserves the right to make improvements in manufacturing or

Designed & manufactured in the USA by:

Crest Audio Inc.

100 Eisenhower Dr.

Paramus, New Jersey 07652 USA

•

••

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