Crest Audio Ci 20 X 4 User manual

Multi-Channel
Power Processing
Amplifiers
Ci
™
SERIES
FEATURES OVERVIEW:
• Four- and eight-channel versions available, each rated @
200 watts per channel @ 8 ohms or 70 volts (100-volts
isolated outputs with optional accessories).
• Individual channels may be selected as low impedance or
70 volt
• Tour Class® protection
• Front and rear panel indicators for amplifier status
• Variable-speed fan
• Sequential turn-on standard
• Euro-style input connectors
• Barrier strip output connectors
• One controlled-voltage input per channel standard
• One fault relay per channel standard
• Module bay provided to input Nx module bay accessories
for full amplifier control and monitoring via NexSys® 4
software or MediaMatrix® product and digital audio
distribution
• 100- and 50-volt operation supported with external
accessories
• EN60849 and ANSI60849 compliant with optional
accessories
DESCRIPTION:
The Ci Series is the next generation family of elevated efficiency
amplification from Crest Audio. Ci amplifiers are designed to
drive low-impedance or 70-volt speaker loads without bridging
between channels. Bridged operations are supported for
additional power into 8-ohm loads or 140-volt operation.
As with all Crest Audio products, sonic performance is of
primary importance. In addition, high-efficiency, comprehensive
load protection and compact packaging have been achieved in
the Ci design.
The Ci Series amplifiers incorporate Crest Audio’s tried-and-
true modular approach to intelligent amplifier configuration.
Through the provision of a single module bay, these amplifiers
may accommodate modules that facilitate load monitoring,
digital audio delivery and Crest Audio’s NexSys networking.
A full complement of features and options makes this series
very versatile, whether powering airport systems, restaurant
audio or a myriad of other applications. The Ci Series amplifiers
bring a new generation of amplification to Crest Audio.
Power Ratings Dual Bridged
8Ω 4Ω 70 volt 8Ω 140 volt
Ci 20x8 220 w 150 w 200 w 300 w 400 w
Ci 20x4 220 w 150 w 220 w 300 w 440 w
1kHz, 0.02% THD+N Power figures are watts per channel, all channels driven.
(Ci 20x8 model shown)

Ci
™
Product Specifications
frequency response 1W @ 8 ohms 5 Hz to 20 kHz, +/-1 dB
power bw rated power @ 4 ohms, 1% THD+N 20 Hz to 20 kHz, +/-1 dB
THD + N <0.02% @ rated power (@ 70 volt, 1kHz)
damping factor 200:1 @ 8 ohms (20 Hz to 100 Hz)
input CMRR >60 dB @ 1kHz
gain / input sensitivity @ 70 volts 1.14 volts for full rated output power (70 volt switch selected)
gain / input sensitivity @ 8Ω 0.775 volts for full rated output power (Low Z switch selected)
input impedance >20 kohms balanced, >10 kohms unbalanced
hum and noise > -97 dB, A-weighted below rated power @ 8 ohms
crosstalk > -60 dB below max rated power (1 kHz)
power supply Linear with toroid transformer
Ci 20x4 Ci 20x8
circuit breaker rating (120V/230V) 6A / 3A 12A / 6A
current draw (120VAC) 1/8 power, 70 volts 2.3A 4.0A
1/3 power, 70 volts 4.4A 8.0A
at idle <1.0A <2.0A
thermal emissions 1/3 Power, 70 volts btu / hr 621 947
cooling Front to side via variable speed fan
input connectors balanced three-pin Euro-style (rear panel)
output connectors barrier strips (rear panel)
power sequence connectors balanced three-pin Euro-style (rear panel)
fault connectors balanced three-pin Euro-style (rear panel)
control voltage connectors balanced two-pin Euro-style (rear panel)
controls front panel: three-position On / Off / Remote power switch
rear panel: stepped attenuators, 70V/Low Z switch, dual/bridged switch,
circuit breaker
LED indicators front and rear panels: Signal, ACL/IGM, Protect, Active, Power Present
construction 16-gauge steel chassis, double thickness in rack ear areas
dimensions (h x w x d) 3.5" x 19" (front panel) 17" (chassis) x 17.3" (18.55" to rack ears)
warranty five years *U.S.A., Canada, United Kingdom and many other countries
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
Crest Audio Inc.
5022 HWY 493 N Meridian, MS 39305 USA
Printed in the U.S.A. 80307271 TEL: [phone] FAX: [phone] www.crestaudio.com