QSC Audio USA 900 User Manual
Page 20
19
USA 400
USA 900
USA 1310
OUTPUT POWER*
both channels driven
FTC: 20 Hz-20 kHz @ 0.1% THD
8
Ω
per channel
110
240
375
EIA:
1
kHz @ 1% THD
8
Ω
per channel
125
270
400
4
Ω
per channel
200
450
655
2
Ω
per channel
250
550
1000
Bridged Mono:
16
Ω
, 1 kHz, 1% THD
250
540
800
8
Ω
, 1 kHz, 1% THD
400
900
1310
*
typical
DYNAMIC HEADROOM
1.9 dB at 4
Ω
DISTORTION
SMPTE-IM
Less than 0.1%
FREQUENCY RESPONSE
20 Hz to 20 kHz, +0/-1 dB
-3 dB points: 8 Hz and 60 kHz
DAMPING FACTOR
Greater than 200 at 8
Ω
NOISE, below rated output
105 dB
104 dB
106 dB
(A Weighted)
VOLTAGE GAIN
29 dB
32 dB
34 dB
INPUT SENSITIVITY, V
RMS
1.12v
1.16v
1.13v
(for rated power into 8 ohms)
INPUT IMPEDANCE
10K
Ω
unbalanced
20K
Ω
balanced
CONTROLS
Front: AC Switch
Rear: Stereo/Bridge Switch, Ch. 1 and Ch. 2 Gain Knobs
INDICATORS
POWER:
Green LED (USA 1310: 1 per channel)
CLIP:
Red LED (1 per channel)
CONNECTORS Input: Barrier strip and Neutrik “Combo” XLR and
1/4" (6.3 mm) TRS, tip and pin 2 positive
Output:
“Touch-Proof” binding posts
COOLING Convection Two-speed fan Two-speed fan
S P E C I F I C AT I O N S S P É C I F I C AT I O N S
ESPECIFICACIONES
TECHNISCHE DATEN