Crest Audio CPA1800 User manual

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 level-
settings when the amplifier is turned on.
Protection features include: short circuit, dc voltage,
comprehensive thermal management, current in-rush turn-
on/off transient, and sub/ultrasonic input.
The Crest Audio CPA1800 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. 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 ampli-
fier. 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-band-
width output devices assure detailed, transparent high fre-
quency 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 manu-
facturing facility, with internal components selected for pre-
miumquality 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 2⁄3hot (+), ground lift, and gain/input sensitivity
.recessed, stepped attenuators
.front panel circuit breaker switch
.modular construction
.five-year warranty*
power specifications 8Ωstereo 4Ωstereo 2Ωstereo 8Ωbridged 4Ωbridged
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
4Ωstereo 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
1000W950W
1800W1700W
2500W2400W
3600W3400W
5000W4800W
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
.775Vstandard, (switchable; see table below)
X115 standard, (switchable; see table below)
>20kΩ 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 2⁄3hot (+)
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 8Ω, 20Hz - 20kHz, 0.1% THD+N, it shall
deliver a minimum of 950 watts per channel.
At 4Ω, 20Hz - 20kHz, 0.1% THD+N, it shall
deliver a minimum of 1700 watts per chan-
nel. In bridged mono mode with an 8Ωload,
20Hz - 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 over-
load 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 cir-
cuitry. Output relays shall protect the speak-
ers from amplifier failure.
Two rear panel mounted variable speed DC
fans (filters detachable without tools) shall pro-
vide back to front air flow through the chassis.
Each channel shall have a standard (factory-
set) 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, 60Hz and 7kHz.
The amplifier shall have a class Houtput
stage. The frequency response shall be 20Hz-
20kHz, +0, -0.3dB (1W8Ω).
The amplifier will operate at 100V-240V,
50-60 Hz AC (configured at factory). Maximum
current draw shall not exceed 36 amperes at
120VAC (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 con-
nectors or 2 pair of 5-way output binding
posts (market dependent). Rear panel switch-
es 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 han-
dles 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 desig-
nated 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