QSC usa 400 pwr sm

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ARCHITECTÕS AND ENGINEERÕS SPECIFICATIONS The power amplifier shall contain all solid-state circuitry, using complementary silicon semiconductors. The amplifier shall operate from 50-60 Hz AC power, with voltages of 100, 120, or 240 Vac. The amplifier shall operate from a normal household AC outlet, drawing less than 900 VA when driven with random program material at 1/8 rated power into four ohm loads. The amplifier shall be supplied with a single molded AC cord having an appropriate AC plug for the intended operating voltage. The amplifier shall contain two independent channels. Each chan- nel shall have independent protective circuitry against open cir- cuit, short circuit, or reactive loads, and the remaining channel shall continue to operate if one channel fails. A muting circuit shall provide three seconds of muting after turn-on, and shall mute within 1/4 second after turn-off or loss of power, to protect the load against turn-on or turn-off thumps. Self resetting ther- mal shutdown shall protect the circuitry against temperatures in excess of 90°C, and a front panel resettable circuit breaker or fuse shall protect against AC overloads. Each channel of the amplifier shall have an independently defeatable limiter. Each channel shall also have bypassable high- pass filtering, with independently selectable -3 dB frequencies of 30 Hz or 50Hz. The limiter and high pass filter controls shall be on an 8-position DIP switch on the amplifierÕs rear panel. Each channel of the amplifier shall typically be capable of meet- ing the following performance criteria, with both channels driven simultaneously, unless otherwise stated: Output power, 8 ohms per channel, 20 Hz-20 kHz, less than 0.1% distortion, at least 110 watts rms per channel. Output power, 4 ohms per channel, 1 kHz, less than 1% distortion, at least 200 watts rms per channel. Frequency response shall be 20 Hz-20 kHz + 0, - 1 dB at 1 watt output. SMPTE IM distortion shall be less than 0.025% at rated power, 8 ohms, and less than 0.05% at rated power, 4 ohms. IHF damping factor shall be at least 200. Signal to noise, below rated output, shall be at least 105 dB (A weighted). Dynamic head- room at 8 ohms shall be at least 2 dB. The voltage gain shall be 29 dB at full gain. The input sensitivity for rated 8 ohm power shall be 1.12 Vrms. Input impedance shall be 20 kilohms bal- anced and unbalanced noninverting, 10 kilohms unbalanced in- verting. Balanced, bridging input circuit shall be standard, and the amplifier shall meet all performance criteria in the balanced or unbalanced mode. The amplifier shall have passive cooling for ultra-quiet operation. Each channel shall have the following controls, indicators, and connectors: Rear mounted gain control calibrated in dB. Clipping indicator, responding proportionally to any distortion in excess of 0.1%. Balanced/unbalanced input jack of the Neutrik "Combo" (combined 1/4" TRS and XLR). Bal- anced input of the barrier strip screw terminal type. Speaker ter- minals of the "touch proof" binding post type. In addition, the chassis shall feature a rear mounted mono-bridging switch, front mounted AC switch and circuit breaker or fuse in some export locations, mounting positions on the rear for optional 70 V out- put transformers, and built-in rack mounting ears. The chassis shall mount in a 19" rack, occupying 3 rack spaces (5.25"). Chas- sis depth behind the rails shall be 8.5" plus 1 in allowance for the binding posts. Weight shall be 24 Ib. The amplifier shall be the QSC Model USA 400. BACK USA 400 Specifications OUTPUT POWER (per channel, typical) 8 ohms, 20 Hz to 20 kHz, 0.1% THD, 110 watts 8 ohms, 1kHz, 1% THD, 125 watts 4 ohms, 1 kHz, 1% THD, 200 watts 2 ohms, 1 kHz, 1% THD, 250 watts OUTPUT POWER (bridged mono) 16 ohms, 1 kHz, 1% THD, 250 watts 8 ohms, 1 kHz, 1% THD 400 watts DISTORTION: SMPTE-IM, less than 0.025% FREQUENCY RESPONSE: 20 Hz to 20 kHz, +0/-1 dB, 1 watt DAMPING FACTOR: Greater than 200 DYNAMIC HEADROOM: 2 dB at 8 ohms NOISE: 105 dB below rated output (A weighted) SENSITIVITY: 1.12 Vrms for rated power (8 ohms) VOLTAGE GAIN: 28 (29 dB) INPUT IMPEDANCE: 10K unbalanced, 20K balanced CONTROLS: Front: AC Switch, AC Circuit Breaker Back: Stereo/Bridge Switch/Ch 1 and Ch 2 Gain Knobs 8 Position DIP Switch for Filter & Limiter INDICATORS: PWR-ON: Green LED CLIP: Red LED, 1 per channel CONNECTORS: (each channel) Input: Barrier strip and Neutrik "Combo" 1/4" TRS and XLR, tip positive Speakers: "Touch proof" binding posts COOLING: Passive AMPLIFIER PROTECTION: Full short circuit , open circuit, ultrasonic, and RF protection. Stable into reactive or mismatched loads. LOAD PROTECTION: On/off muting and DC-fault protection. OUTPUT CIRCUIT TYPE: Complementary linear outputs. POWER REQUIREMENTS: 100,120, 240 Vac, 50-60 Hz POWER CONSUMPTION: Normal Operation: 4 ohms per channel: less than 4.4 amps, 120 Vac (900 VA) DIMENSIONS:19.0" (48.3 cm) rack mounting 5.25" (13.3 cm) tall (3 spaces) 9.5" (24.1 cm) deep WEIGHT: 24 Ibs (10.9 kg) net, 28 Ibs (12.7 kg) shipping  Output Averaging ª short circuit protection (US Patent 4,321,554) SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Phone: 714/754-6175 Fax: 714/754-6174