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USA Series Amplifiers

(Discontinued)

USA Amplifier

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

USA SERIES AMPLIFIERS

  • USA 400
  • USA 900
  • USA 1310

DOCUMENTS

USA 400 Specifications (PDF 38K)
USA 900 Specifications (PDF 48K)
USA 1310 Specifications (PDF 74K)
USA Series User Manual (PDF 934K)
USA Series Service Manual

SCHEMATICS

USA 400 (ZIP 371K)
USA 900 (ZIP 648K)
USA 1310 (ZIP 742K)



USA Series
From top: USA 400, USA 900, USA 1310




 
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

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