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Specifications 4-Channel Low-Impedance Models
CX254 CX404
OUTPUT POWER (Watts)
20 - 20k Hz, 0.03% THD, 8 Ohms/Ch. 170 250
20 - 20k Hz, 0.05% THD, 4 Ohms/Ch. 250
1k Hz, 1.0% THD (EIA), 8 Ohms/Ch.
1k Hz, 1.0% THD (EIA), 4 Ohms/Ch. 450
1k Hz, 1.0% THD (EIA), 2 Ohms/Ch. 450
Bridge Mono, 20 - 20k Hz, 0.1% THD, 16 Ohms 340 500
Bridge Mono, 20 - 20k Hz, 0.1% THD, 8 Ohms 500
Bridge Mono, 1k Hz, 1.0% THD, 8 Ohms 900
Bridge Mono, 1k Hz, 1.0% THD, 4 Ohms 900
DISTORTION, SMPTE-IM <0.01% <0.01%
FREQUENCY RESPONSE 20 - 20k Hz, ±0.2dB at 10dB below rated output power, all models (-3dB points: 8 Hz and 100 kHz)
SIGNAL to NOISE, unweighted, 20 - 20k Hz -106 dB -106 dB
VOLTAGE GAIN 29.0x (29dB) 36.5x (31dB)
INPUT SENSITIVITY, Vrms
for rated power into 8 Ohms 1.28 (+4.4dBu) 1.22 (+3.9dBu)
for rated power into 4 Ohms 1.08 (+2.9dBu) EIA: 1.16 (+3.5dBu)
OUTPUT CIRCUIT TYPE AB AB
INPUT IMPEDANCE 6k ohms unbalanced, 12k ohms balanced, all models
DYNAMIC HEADROOM 2 dB at 4 Ohms, all models
DAMPING FACTOR >500 at 8 Ohms, all models
AMPLIFIER PROTECTION Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads
COOLING Continuously variable speed fan; back-to-front air flow through heat sink tunnel
CONTROLS Front: AC POWER switch, gain controls (1 control per channel, 21 detents)
Back: 10-position DIP switch (1 per channel pair) with Clip Limiter (1 per Ch.), LF Filter on/off (1 per Ch.)
LF filter select: 33 or 50 Hz (1 per Ch.), Stereo/Parallel/Bridge mode selection switches (1 set per Ch. pair)
LED INDICATORS POWER (green, 1 each), SIGNAL, -10dB, -20dB (green, 1 each per Ch.), CLIP (red, 1 each per channel),
BRDG and PAR (yellow, 1 each per Ch. pair)
CONNECTORS Input: 3-pin terminal block ("euro" or "Phoenix" type)
Output: barrier strip connectors with protective shroud, one barrier strip per Ch. pair
Other: two QSC DataPort connectors (supports full “V1”feature set), one DataPort per Ch. pair
LOAD PROTECTION Turn-on/turnoff muting, AC coupling (DC fault blocking), Clip limiting.
POWER REQUIREMENTS Refer to rear panel serial number label. Configured at factory for 100, 120 or 220-240 VAC, 50- 60 Hz.
DIMENSIONS 19.0" (48.3 cm) W, 3.5" (8.9 cm) H, 14" (35.6 cm) D (from front mounting rails, including rear support ears)
WEIGHT 21 pounds (9.5 kg) net; 27 pounds (12.3 kg) shipping
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE