Qsc - Usa900 电路图.pdf

《Qsc - Usa900 电路图.pdf》由会员分享，可在线阅读，更多相关《Qsc - Usa900 电路图.pdf（2页珍藏版）》请在收音机爱好者资料库上搜索。

1、USA 900 FEATURES he USA 900, a member of QSCs world-wide best-selling line of amplifiers, is now even better. The USA Series now offers even more value and performance: Neutrik Combo input connectors (1/4” and XLR), selectable limiters, variable low-frequency filters, and even more power in a new ru

2、gged, all-steel chassis. Other standard features include comprehensive amplifier and load protection, ample heat sinks, USA Series LOAD20Hz-20kHz, 0.1% THD (typical)1kHz, 1% THD (typical) Stereo (W/Ch) 8240 watts270 watts 4450 watts 2550 watts Mono-Bridged 16480 watts540 watts 8900 watts 550 watts p

3、er channel at 2 ohms 450 watts per channel at 4 ohms Built-in limiting (defeatable) for speaker protection Selectable high-pass filter (30 Hz, 50 Hz, or out) Active balanced inputs Neutrik ”Combo“ input connectors accommodate both 1/4” TRS and XLR Barrier strip inputs ”Touch-proof“ binding post outp

4、uts Two-speed fan cooling LED clip indicators Patented Output Averaging short circuit protection Stereo, bridged mono, or parallel operation QSC reliability and audio performance Made in USA 3-year warranty PLUS optional 3-year extended warranty clip indicators, mono-bridging switch, and active bala

5、nced inputs. The USA 900 is ideal for live sound specialists, system installers, and other professionals who demand QSCs legendary reliability and audio quality. QSC Audio Productsthe leader in amplifier technology. 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Phone: 714/754-6175 F

6、ax: 714/754-6174 RadioFans.CN 收音机爱 好者资料库 ARCHITECTS AND ENGINEERS 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 ope

7、rate from a normal household AC outlet, drawing less than 1030 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 contai

8、n 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 m

9、ute 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 90C, and a front panel resettable circuit breaker or fuse shall protect against AC overloads.

10、 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 amplifi

11、ers 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 240 watts rms per channel.

12、Output power, 4 ohms per channel, 1 kHz, less than 1% distortion, at least 450 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 f

13、actor shall be at least 200. Signal to noise, below rated output, shall be at least 104 dB (A weighted). Dynamic head- room at 8 ohms shall be at least 2 dB. The voltage gain shall be 32 dB at full gain. The input sensitivity for rated 8 ohm power shall be 1.16 Vrms. Input impedance shall be 20 kilo

14、hms 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 built-in fan cool- ing, with automatic two-speed opera

15、tion. Air flow shall be from the back to front. Each channel shall have the following controls, indicators, and connectors: Rear mounted gain control calibrated in dB. Clipping indicator, responding proportionally to any distor- tion in excess of 0.1%. Balanced/unbalanced input jack of the Neutrik “

16、Combo” (combined 1/4” TRS and XLR). Balanced input of the barrier strip screw terminal type. Speaker terminals 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 locatio

17、ns, mounting positions on the rear for optional 70 V output trans- formers, and built-in rack mounting ears. The chassis shall mount in a 19 rack, occupying 3 rack spaces (5.25). Chassis depth be- hind the rails shall be 8.5 plus 1 in allowance for the binding posts. Weight shall be 34 Ib. The ampli

18、fier shall be the QSC Model USA 900. BACK USA 900 Specifications 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Phone: 714/754-6175 Fax: 714/754-6174 OUTPUT POWER (per channel, typical) 8 ohms, 20 Hz to 20 kHz, 0.1%THD, 240 watts 8 ohms, 1kHz,1%THD, 270 watts 4 ohms, 1 kHz,1%THD, 450

19、 watts 2 ohms, 1 kHz,1%THD, 550 watts OUTPUT POWER (bridged mono) 16 ohms, 1 kHz,1%THD, 540 watts 8 ohms, 1 kHz,1%THD 900 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: 104 dB

20、 below rated output (A weighted) SENSITIVITY: 1.16 Vrms for rated power (8 ohms) VOLTAGE GAIN: 40 (32 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 INDICATO

21、RS: 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: Two-speed fan, rear-to-front air flow. AMPLIFIER PROTECTION: Full short circuit, open circuit, ultrasonic, and

22、 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 8.6 amps, 120 Vac (1030 VA) DIMENSIONS: 19.0 (48.3 cm) rack mounting 5.25 (13.3 cm) tall (3 spaces) 9.5 (24.1 cm) deep WEIGHT: 34 Ibs (15.4 kg) net, 37 Ibs (16.8 kg) shipping Output Averaging short circuit protection (US Patent 4,321,554) SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. RadioFans.CN 收音机爱 好者资料库