QSC USA 400 Power Amplifier - Used QSC USA 400 Power Amplifier - Used We are an authorized QSC dealer. This amplifier has been tested/inspected and works great! We ship all orders FedEx fully insured within two days of transaction completion. FedEx requires that we provide them with the purchaser's phone number, so be sure to include it. We do not ship internationally, if you are in Alaska or Hawaii please contact us for a freight quote, Washington residents add 9.5% sales tax. The USA 400 amplifier delivers legendary QSC reliability and audio performance at an economical price. Quiet fan-free cooling makes this power amp the ideal choice for studio and control room use. The USA 400 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 QSC's superior audio performance and reliability, make the USA 400 a perennial best seller. 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. Specifications STEREO MODE (Both Channels Driven) 8 ohms: 20 Hz - 20 kHz, 0.1% THD --- 110 W 1 kHz, 1% THD --- 125 W 4 ohms: 1 kHz, 1% THD --- 200 W 2 ohms: 1 kHz, 1% THD --- 250 W BRIDGE MONO MODE 16 ohms: 1 kHz, 1% THD --- 250 W 8 ohms: 1 kHz, 1% THD --- 400 W Signal to noise (A weighted): 105 dB Input Sensitivity @ 8 ohms: 1.12 Vrms (+3.2 dBu) Voltage Gain: 28x (29 dB) Cooling: Passive Power Consumption (1/8 power @ 4 ohms/ch. both channels driven, 120VAC) *: < 6A 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) Weight: 24 lbs (10.9 kg) net QSC Spec Sheet
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