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The 2RU CM 2204 Professional Installation Amplifier from Crest Audio drives 4 independent channels into low impedance or 70V loads. Each channel can drive 4Ω, and up to 4 channels are allowed. A switch allows selection of 0.775 Volt sensitivity or x40 gain. A high-pass filter is selectable per channel.
The on-board protection suite includes Crest Audio's proprietary ACL (Automatic Clip Limiting) circuitry, which prevents the amplifier from sending potentially damaging clipped signals to the loudspeakers. It also features 4 Clip, 4 Signal, 4 Protect, and Active safeguards for each channel, all referenced on the front panel with LED indicators along with the power indicator. The Instantaneous Gain Modulation (IGM) circuit adjusts the channel gain to a safe level. The featured AUTORAMP signal control attenuates the signal while the speakers are disconnected. This unit is cooled by a variable speed fan with front-to-side airflow.
ACL (Automatic Clip Limiting) protection
Instantaneous Gain Modulation (IGM) circuit adjusts the channel gain to a safe level
AUTORAMP signal control attenuates the signal while the speakers are disconnected
Cooled by a variable speed fan with front-to-side airflow
Recessed, stepped attenuators
16-gauge steel-reinforced with 12-gauge rack ears
Made in the USA
In the Box
Crest Audio CM 2204 Professional Installation Amplifier (2RU)
Limited 5-Year Warranty
Table of Contents
Bridge 8 Ω: 320 W
Bridge 140 V: 440 W
1 channel x 4 Ω: 160 W
1 channel x 8 Ω: 245 W
70.7 V, 24 Ω: 220 W
4 channel x 4 Ω: 155 W
4 channel x 8 Ω: 240 W
4 channel x 70.7 V: 180 W
>200:1 @ 20 Hz - 1 kHz @ 8 Ω
0.775 V (0 dBu setting)
Balanced: 20 kΩ
Unbalanced: 10 kΩ
Minimum Load Impedance
x40 or 0 dBu (x90)
> -60 dB @ 1 kHz at rated power @ 8 Ω
Hum and Noise
> -97 dB, below rated output, 22 Hz - 22 kHz
5 Hz - 20 kHz, -1 dB @ 1 W (8 Ω load)
Total Harmonic Distortion (THD)
<0.02% @ rated power, 1 kHz (70.7 V)
> -60 dB @ 1 kHz
4 x 3-position Euro-style detachable terminal block, input (1 per channel)
4 x 2-position Euro-style detachable terminal block, output (1 per channel)
1 x 3-pin IEC, power input
4 x Channel input signal attenuator (1 per channel)
4 x Channel HPF selection switch (1 per channel)
4 x Channel gain selection switch (1 per channel)
1 x On/Off switch
4 x Clip (1 per channel)
4 x Signal (1 per channel)
4 x Protect (1 per channel)
1 x Active
Variable speed, front panel mounted, front-to-side airflow