USA Series Amplifiers

(Discontinued)

3RU models: USA 400 | USA 900
4RU model: USA 1310

USA Series amplifiers deliver legendary QSC reliability and audio performance at an economical price. Three models offer a range of power from 250 to 1000 watts per channel at 2 ohms. Quiet fan-free cooling makes the USA 400 the ideal choice for studio and control room use. The fan-cooled USA 900 and 1310 are perfect for high-power applications such as live sound reinforcement and system installations. USA Series is the industry leader in amplifier value.

The USA Series includes a comprehensive set of advanced features. Neutrik Combo connectors provide active balanced XLR and 1/4" TRS inputs for maximum input flexibility. Selectable input limiters reduce prolonged amplifier clipping,dramatically lowering distortion and protecting speakers.Variable low-frequency filters (30 Hz, 50 Hz, or flat) limit sub-audio cone motion, protecting speakers and increasing useable power within the speaker's operating range. These features, combined with our superior audio performance and reliability, make USA amplifiers some of our best sellers.

USA Series Power Amplifiers

Model	Stereo watts per channel
	8 ohms	4 ohms	2 ohms
USA 400	125	200	250
USA 900	270	450	500
USA 1310	400	655	1000

1 kHz, 1% THD, both channels driven

FEATURES

Full complementary output circuit for low distortion (>0.1% THD, 20 Hz - 20 kHz)
2-speed fan cooling for solid 2 ohm performance (USA 900 & 1310)
Quiet convection cooling on USA 400 for studio monitoring
Built-in clip limiter and low-frequency filter to reduce distortion and protect speakers
Active balanced inputs for low noise
Neutrik "Combo" inputs that accept both 1/4" TRS and XLR connectors
Patented Output Averaging™ short circuit protection
3 year warranty plus optional 3 year extended service contract

SPECIFICATIONS	USA 400	USA 900	USA 1310
	STEREO MODE (Both Channels Driven)
8 ohms 20 Hz - 20 kHz, 0.1% THD 1 kHz, 1% THD	110 W 125 W	240 W 270 W	375 W 400 W
4 ohms 1 kHz, 1% THD	200 W	450 W	655 W
2 ohms 1 kHz, 1% THD	250 W	550 W	1000 W
	BRIDGE MONO MODE
16 ohms 1 kHz, 1% THD	250 W	540 W	800 W
8 ohms 1 kHz, 1% THD	400 W	900 W	1310 W
Signal to noise (A weighted)	105 dB	104 dB	106 dB
Input Sensitivity @ 8 ohms	1.12 Vrms (+3.2 dBu)	1.16 Vrms (+3.5 dBu)	1.13 Vrms (+3.3 dBu)
Voltage Gain	28x (29 dB)	40x (32 dB)	50x (34 dB)
Cooling	Passive	2-speed fan	2-speed fan
Power Consumption (1/8 power @ 4 ohms/ch. both channels driven, 120VAC) *	< 6A	< 9A	< 12A
DIstortion (SMPTE-IM)	Less than 0.025%
Frequency Response	20 Hz - 20 kHz, +0/-1 dB @ 1 watt
Damping Factor	Greater than 200
Dynamic Headroom	2 dB at 8 ohms
Input Impedance	10k ohms unbalanced, 20k ohms balanced
Connectors, each channel	Input: Barrier strip and Neutrik "Combo" 1/4" TRS and XLR, tip and pin 2 positive Output: touch-proof binding posts
Controls	Front: AC switch, AC Circuit Breaker Rear: Stereo/Bridge switch, Ch. 1 and Ch. 2 gain knobs, 8 position DIP switch for filter & limiter
Indicators	Power-On: Green LED Clip: Red LED (1 per channel)
Amplifier Protection	Full short circuit, open circuit, ultrasonic and RF protection. Stable into reactive or mismatched loads
Load Protection	On/off muting, DC fault power protection
Power Requirements	100, 120, 230 VAC, 50-60 Hz
Dimensions (WxHxD)	19" x 5.25" x 9.5 " (3 RU) (48.3 cm x 13.3 cm x 24.1 cm)	19" x 5.25" x 9.5 " (3 RU) (48.3 cm x 13.3 cm x 24.1 cm)	19" x 7.0 " x 10.8 " (4 RU) (48.3 cm x 17.8 cm x 27.4 cm)
Weight	24 lbs (10.9 kg) net	34 lbs (15.4 kg) net	54 lbs (24.4 kg) net

multiply by 0.5 for 230V operation, by 1.2 for 100V operation

All Specification Subject to Change Without Notice.

Output Averaging is a trademark of QSC Audio Products