Crest Audio CD User manual

CD
SERIES
Features Description
• Dramatically reduced net weight
• Linear power supply / digital output stages
• Very low current draw
• Latest generation of high-speed, mosfet output devices
• Cooled by variable speed fan with back-to-front airflow
• Inputs - Balanced female Neutrik XLR, 1/4” TRS combo jacks
• Outputs - Neutrik Speakon and 5-way “touch-proof” binding posts
• Mode selector switch for stereo, parallel and bridged-mono operation
• Ground-lift switch and rear panel circuit breaker
• Recessed, stepped attenuators with removable knobs
• 16-gauge steel chassis, cast aluminum front-panel
TourClass®protection circuits
ACL (Active Clip Limiting) prevents speaker damage by providing
gentle gain reduction when signal approaches the clipping threshold.
IGM (Instantaneous Gain Modulation) monitors speaker loads to
detect conditions that may overstress output devices. This allows
safe operation into nominal 2 ohm speaker loads.
AUTORAMP gradually increases gain to the attenuator level-set-
tings when the amplifier is turned on. This prevents abrupt turn-on
level.
Other protection features include: short circuit, dc voltage, com-
prehensive thermal management, current in-rush turn-on/off tran-
sient, and sub/ultrasonic input.
The CD Series amplifier is the next generation family of ele-
vated efficiency amplification from Crest Audio. With sonic
performance the primary priority, the CD Series uses a com-
bination of a linear power supply and a class D output to deliv-
er Crest Power in a compact and cost-effective package.
A full complement of features and power-points makes this
series very versatile, whether powering nightclub systems or
high school gymnasiums. The CD series amplifiers bring a
new generation of amplification to Crest Audio.
Linear-toroid power supply
A traditional linear power supply is used in the CD Series.
Because of the efficiency of the switching output stage, the
transformer does not need to be as big or as heavy. This gives
the CD Series an advantage in delivering more power in a
more compact package. The efficiency of the output stage
also gives the power supply the ability to handle heavy-duty
cycles without compromising sonic integrity.
Switching output stage
Crest Audio’s engineering has maintained sonic quality while
incorporating the advantages of a switching output stage.
The high-power class D topology is the key to its efficiency
and low operating temperature. An additional advantage to
this design is the amount of power needed over time. This
amplifier will dramatically reduce the number of kW / hr need-
ed to operate.
power specifications 8Ωstereo 4Ω/ 2Ω1stereo 8Ω/ 4Ω1bridged
CD3000 800W 1500W 3000W
CD2000 560W 1000W 2000W
CD1500 400W 750W 1500W
CD1000 280W 500W 1000W
1kHz, 0.2% THD+N / 12Ω stereo and 4Ω bridged operation at 1kHz, 0.4% THD+N
CD1000 - CD3000
Power Amplifiers
(CD3000 model shown)

Specifications CD Series Power Amplifiers
stereo power 8 ohms
4 / 21ohms
bridged mono power 8 / 41ohms
maximum output voltage
frequency response 1W @ 8 ohms
power bw rated power @ 4 ohms, 1% THD+N
THD + N
imd; SMPTE/DIN 4:1 (60 Hz / 7 KHz)
damping factor
input CMRR
gain / input sensitivity @ 4 ohms
input impedance
hum and noise
crosstalk
class
power supply
circuit breaker rating (120V/230V)
current draw (120VAC) 1/8 power, 4 ohms
1/3 power, 4 ohms
at idle
thermal emissions 1/3 Power, 4 ohms btu / hr
cooling
input connectors
output connectors
controls
LED indicators
construction
dimensions
weight
warranty
CD1000 CD1500 CD2000 CD3000
280W 400W 560W 800W
500W 750W 1000W 1500W
1000W 1500W 2000W 3000W
53V rms 64V rms 72V rms 85V rms
1kHz, 0.2% THD+N Power figures are watts per channel, both channels driven.
11kHz, 0.4% THD+N for 2 ohm stereo and 4 ohm bridged operation.
20Hz–20kHz, +/-1dB
20Hz–20kHz, +/-1dB
<0.2% rated power @ 4 ohms, 1kHz
<0.35% @ -3 dB below rated power @ 8 ohms
400:1 @ 8 ohms (20 Hz to 100 Hz)
>60dB @ 1kHz
Selectable: x20, x40, or .775 V for full rated output power
>20kohms balanced, >10kohms unbalanced
> -100dB, A-weighted below rated power @ 4 ohms
> -60dB below max rated power (1kHz)
D
Linear with toroid transformer
10A / 6A 12A / 8A 15A / 10A 20A /12A
2.6A 3.6A 4.5A 7.0A
5.3A 7.5A 9.6A 14.0A
1.0A 1.1A 1.25A 1.5A
484 614 781 1024
Back to front via variable speed DC fan
balanced female XLR, 1/4"TRS, unbalanced 1/4”TS on Neutrik combo connectors
Five-way “touch-proof”binding posts and Neutrik Speakon™connectors (which presents
both outputs on the A Speakon™for bi-amplified applications)
front panel: twin recessed stepped attenuators, power switch
rear panel: signal ground-lift, mode select, gain select, circuit breaker
signal level (5 element bargraph), protect, active, ACL / IGM
16-gauge steel chassis, cast aluminum front panel - optional handles available
3.5" x 19" (front panel) 17" (chassis) x 15.3”(16.55" to rack ears) hxwxd
30 lbs 35 lbs 38 lbs 41.4 lbs
five years USA, Canada, United Kingdom, and many other countries
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn NJ 07410 USA
TEL: [phone] FAX: [phone]
www.crestaudio.com
80307074
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
9.22.04
v.1.5
Architects’ & Engineers’ Specifications:
The power amplifier shall consist of 2 chan-
nels. Each channel will deliver a minimum of
(280 / 400 / 560 / 800) watts at 8 ohms, (500 /
750 / 1000 / 1500) watts at 4 or 2 ohms, 1 kHz.
In bridged mono mode, it will deliver a mini-
mum of (1000 / 1500 / 2000 / 3000) watts at 8
or 4 ohms, 1 kHz. It shall weigh (30 / 35 / 38 /
41.4) lbs. The amplifier shall incorporate pro-
tection circuitry against output short circuits,
DC voltage on outputs, thermal overload and
load protection due to any form of amp failure.
It will include impedance sensing circuitry, and
RMS clip limiter and Auto-Ramp signal control.
The amplifier shall have a sensitivity of .775V
at the input, which will deliver full rated output
power at 4 ohms. Gain can be changed to x20
or x40. The hum and noise level shall be
greater than 100dB below rated output at 4
ohms, "A" weighted. The amplifier shall have a
class D output stage with a linear power sup-
ply. The frequency response shall be greater
than 20 Hz - 20 kHz, +/-1 dB, at full rated out-
put power @ 4 ohms, 1%THD. The amplifier
will operate at either 120 VAC, 60Hz (safe
operating range 100-132VAC) or at 230 VAC,
50Hz (safe operating range 200-253), voltage
selection determined at factory. Maximum cur-
rent draw at 120V shall be no greater then 15
A (CD3000), both channels driven continuous-
ly into 4 ohm load at 1/3 power. Front panel
indicators shall include LED indicators for
Protect, ACL / IGM (automatic clip limit), Signal
level, and Active status. Front panel attenua-
tors will be recessed and detented. Input con-
nectors shall be Neutrik Combo™connectors
featuring balanced inputs on female XLR and
1/4" TRS, and unbalanced inputs on 1/4”TS ,
one per channel. Output connectors shall be
5-way binding posts and Speakon, per chan-
nel. A switch shall enable the signal ground to
be lifted from the chassis. The packaging of the
amplifier shall allow for standard rack mounting
without requiring space between similar units
as long as rack is properly ventilated.
Dimensions main chassis shall be 17" wide
(front panel is 19" wide), 15.3" deep (16.55"
including rear rack ears), 3.5" high. The ampli-
fiers shall be designated the Crest Audio Model
CD1000, CD1500, CD2000, and CD3000.
CD2000 rear panel shown