Crest audio CPA1800 SPECIFICATIONS

description features

TourClass®protection circuits

acl active clip limiting prevents speaker damage by
providing gentle gain reduction at the clipping threshold.

igm instantaneous gain modulation monitors speaker loads to
detect conditions that may overstress output devices, allowing safe
operation into difficult impedances.

autoramp gradually increases gain to the attenuator level­settings when the amplifier is turned on.

Protection features include: short circuit, dc voltage,

comprehensive thermal management, current in-rush turn­on/off transient, and sub/ultrasonic input.

The Crest Audio CPA1800 professional power amplifier is
designed to achieve unsurpassed sonic performance and long­term reliability – even when operating under extreme stress
– in touring or fixed installation applications. The CPA1800
provides high power output coupled with true clarity, and is
well-suited for high-powered subwoofers and passive full
range systems.

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 CPA1800 will drive 2

Ω

loads safely without compromise

in performance.

Construction and Quality Control

The CPA1800 is built exclusively in Crest’s own USA manu­facturing facility, with internal components selected for pre­miumquality and proven durability. Each modular
subassembly is pre-tested, and once assembled, the CPA1800
receives a rigorous “hot room” burn-in before thorough final
pre-shipment checkout on precision test equipment.

.

Crest's legendary “over-built” 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

.

Speakon™connectors or 2 pair of five-way binding post outputs
(market dependent)

.

external switches for stereo/parallel/bridged mono mode,
pin

2

⁄3 hot (+), ground lift, and gain/input sensitivity

.

recessed, stepped attenuators

.

front panel circuit breaker switch

.

modular construction

.

five-year warranty*

power specifications 8Ω stereo 4Ω stereo 2Ω stereo 8Ω bridged 4Ω bridged

1kHz, 0.01% THD 1000w 1800w 2500w 3600w 5000w
20Hz-20kHz, 0.1% THD+N 950w 1700w 2400w 3400w 4800w

Power figures are watts per channel, both channels driven.

CPA1800

CPA1800 power amplifier

4Ω stereo CPA400 CPA600 CPA900 CPA1200

1kHz, 0.01% THD+N 435w 600w 900w 1200w
20Hz-20kHz, 0.1% THD+N 400w 500w 800w 1100w

power specifications:
other CPA Series power amplifiers

1kHz, 0.1% THD+N 20Hz–20kHz, 0.1% THD+N

1000W 950W
1800W 1700W
2500W 2400W
3600W 3400W
5000W 4800W
99V rms, 140V peak each channel

20Hz–20kHz, +0 / -0.3dB,-3dB@150kHz
20Hz–20kHz, -.2dB/ +.2dB

<0.03% rated power @ 4Ω, 1kHz
<0.01% rated power @ 8Ω, 60Hz and 7kHz
800:1 10–400Hz @ 8Ω

>-70dB @ 1kHz
.775V standard, (switchable; see table below)

X115 standard, (switchable; see table below)

>20

kΩ balanced, >10kΩ unbalanced

-115dB, A-weighted full power @ 4Ω

> -80dB A-weighted full power @ 4Ω

H
100–240 vac

@ 50–60Hz factory configured

36A @ 120V
<12.0A @120V
<25.0 @120V
<36.0A @120V
<3.0A @120V
36A

7125 BTU/Hr
9450 BTU/Hr
back-to-front via two rear-mounted variable-speed DC fans
(filters removable without tools)

female xlr pin 2+

dealer-configurable for pin 3+ trs (tip+)

speakon connectors or five-way output binding posts

front panel: two attenuators,
rear panel: signal ground-lift switch, mode select switch, XLR input pin

2

⁄3 hot (+)

acl, signal, temp/dc

: active

acl, igm, autoramp, short circuit, dc voltage, turn-on/-off transient,
current in-rush, sub/ultrasonic input

steel chassis, 16-gauge double thickness in rack-ear areas

3.5" x 19" x 18" 89mm x 483 x 457mm

height x width x depth

gross:

38lbs 17.25kg

net:

75lbs 34kg

five years* USA, Canada, United Kingdom, and many other countries

specifications

Crest Audio Inc.

100 Eisenhower Dr., Paramus NJ 07652 USA

TEL: [phone] FAX: [phone]

http://www.crestaudio.com

Crest Audio specification literature is available
in downloadable PDF format at our website
http://www.crestaudio.com

Power figures are watts per channel,
both channels driven.

©

¹⁹⁹⁸

crest audio inc.

Crest Audio reserves the right to make
improvements in manufacturing or design
which may affect specification.

*A4500005*

CPA1800 power amplifier

The power amplifier shall have two channels.
At 8

Ω, 20Hz - 20kHz, 0.1% THD+N, it shall

deliver a minimum of 950 watts per channel.
At 4

Ω, 20Hz - 20kHz, 0.1% THD+N, it shall

deliver a minimum of 1700 watts per chan­nel. In bridged mono mode with an 8

Ω load,

20

Hz - 20kHz, 0.1% THD+N, it shall deliver a

minimum of 3400 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 (factory­set) input sensitivity of .775 volt, and shall be
fitted with an external switch which allows the
gain to be altered to

X20 or X40. The hum

and noise level shall be 115

dB below rated

output, “A” weighted.

SMPTE IMD shall be less

than 0.01% at rated power, 60

Hz and 7kHz.

The amplifier shall have a class

H output

stage. The frequency response shall be 20

Hz-

20

kHz, +0, -0.3dB (1W 8Ω).

The amplifier will operate at 100

V-240V,

50-60

Hz AC (configured at factory). Maximum

current draw shall not exceed 36 amperes at
120

VAC (limited by front panel breaker).

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, rear-panel switchable for

pin 2 (factory setting) or pin 3 positive.
Output terminations shall be Speakon con­nectors or 2 pair of 5-way output binding
posts (market dependent). Rear panel switch­es for ground lift, Stereo/Parallel/ Bridged
Mono mode,

XLR polarity and gain selection

shall also be provided.

A rear-panel

AC mains cord having an appro-

priate

AC plug for the intended operating volt-

age shall be provided.

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
77 lbs. (34.96 kg.) net, and shall be desig­nated the Crest Audio model CPA1800.

v. 1.0 10/5/98

stereo power 8Ω

4Ω
2Ω

bridged mono power 8Ω

4Ω

maximum output voltage

frequency response

1W @ 8Ω

power bandwidth rated power @ 4Ω, 1% THD+N

THD+N

SMPTE IMD

damping factor

input

CMRR

input sensitivity rated power @ 8Ω

voltage gian

input impedance

hum and noise

crosstalk

class

power supply

circuit breaker rating

4Ω

current draw 1/8 power, 4Ω

1/3 power, 4Ω

at power-up

at idle

peak current draw

thermal emissions

1/8 Power, 4Ω

1/3 Power, 4Ω

cooling

input connectors

output connectors

controls

LED indicators

TourClass

®

protection

construction

dimensions

weight

warranty

architect’s specifications

rear view CPA1800

Power figures are
watts per channel,
both channels driven.

*Three-year Warranty
with two additional years,
if Registration Card is
sent to Crest Audio.

dealer-configurable gain/

sensitivity options

gain sens

factory standard x115 .775V
option1 x40 2.24V
option 2 x20 4.47V