Crest Audio PRO II SERIES 4802 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 nominal 2Ωspeaker loads.
autoramp gradually increases gain to the attenuator level-
settings when the amplifier is turned on.
Other protection features include: short circuit, dc voltage,
comprehensive thermal management, current in-rush turn-
on/off transient, and sub/ultrasonic input.
superior sound quality
excellent low frequency and transient response
louder than conventional amplifiers
—maximum output level never dips
constant, predictable performance
consistent power output
accepts any line voltage worldwide—50 or 60Hz
accepts long power cable runs with no loss of output power
draws significantly less peak current
lighter-duty power distribution components
low line-voltage distortion
minimal supply-ripple
cost-effective
extreme reliability
reduced shipping costs—half the weight of conventional amplifiers
The Pro II Series heralds a major advance in amplifier design
from Crest Audio. Extreme reliability and hallmark sonic accu-
racy of the legendary Professional Series is maintained in the
same rugged package—but at only half the weight. Such dra-
matic weight savings are made possible by PowerLok, a radical
new power-supply technology that provides significant perfor-
mance and flexibility advances over conventional designs.
PowerLok is Crest Audio’s unique implementation of Power
Factor Correction, which allows current to be drawn
throughout the entire cycle of the AC line-frequency, provid-
ing maximum output power, while drawing significantly
smaller peak currents from the AC line.
Compared with an amplifier using a conventional power-sup-
ply, PowerLok requires less peak power to produce identical
output power results—and because PowerLok’s current peaks
are smaller, a Pro II amplifier can be serviced by a lower-rated
breaker than a conventional amplifier of similar wattage.
.
PowerLok technology
.dramatically reduced net weight
.latest generation of high-speed, wide-bandwidth output devices
.twin-tunnel cooling with back-to-front air flow
.dual, rear-mounted, continuously-variable-speed fans
.balanced male and female xlr inputs
with switch-configurable xlr polarity and sensitivity selection
.Speakon and five-way binding post output connectors
.stereo, parallel, bridged-mono: mode selector switch
.ground-lift switch
.front panel power switch, rear panel circuit-breaker
.recessed, stepped attenuators
.modular construction
.aluminum chassis
.five-year warranty
preliminary power specifications 8Ωstereo 4Ωstereo 2Ωstereo 8Ωbridged 4Ωbridged
1kHz, 0.01% THD+N 370w 600w 800w 1200w 1600w
20Hz-20kHz, 0.1% THD+N 350w 570w 760w 1140w 1520w
Power figures are watts per channel, both channels driven.
4802
4802 power amplifier

*A4400070*
v. 1.0 9/17/98
1kHz, 0.01% THD+N 20Hz–20kHz, 0.1% THD+N
370W350W
600W570W
800W760W
1200W1140W
1600W1520W
56V rms, 79V peak each channel
20Hz–20kHz, +0 / -0.3dB,-3dB@135kHz
20Hz–20kHz, +0 / -0.23dB
<0.05% rated power @4Ω, 1kHz
<0.01% rated power @ 8Ω, 60Hz and 7kHz
400:1 10–400Hz @8Ω
>60dB @1kHz
.775Vconstant sensitivity, x20 or x40 constant gain
>20kΩ balanced, >10kΩ unbalanced
-110dB, A-weighted below rated power
> -80dB @1kHz below rated power
H
two versions: 90–255 or 180–255 vac @50–60Hz factory configured
PowerLok power supply with active power factor correction
25A @120V
<3.1A @120V
<8.3A @120V
<1.5A @120V
TBD
756 BTU/Hr
2000 BTU/Hr
back-to-front via two rear-mounted variable-speed DC fans
female and male xlr pin 2+ switch-configurable for pin 3+
Speakon connectors and five-way output binding posts
front panel: two attenuators, power switch incorporating magnetic circuit breaker
rear panel: signal ground-lift, mode select, input sensitivity, pin 2/3+ switches
acl, signal, status bi-color: active / protect
acl, igm, autoramp, short circuit, dc voltage, turn-on/-off transient,
current in-rush, sub/ultrasonic input
aluminum chassis double thickness in rack-ear areas
3.5” x 19” x 18” 133 x 483 x 457mm height x width x depth
gross: 30.0lbs 13.6kg
net: 25.0lbs 11.3kg
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
Architech’s specifications for this model
and other product information is available
in downloadable PDF format
at 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.
4802 power amplifier
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
switch-configurable input options
input impedance
hum and noise
crosstalk
class
Power supply
Circuit breaker rating
Current draw 1/8 power, 4Ω
1/3 power, 4Ω
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
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