Qsc - Pl38X 电路图.pdf

《Qsc - Pl38X 电路图.pdf》由会员分享，可在线阅读，更多相关《Qsc - Pl38X 电路图.pdf（2页珍藏版）》请在收音机爱好者资料库上搜索。

1、The PowerLight3.8Xis an advanced dual-power professional audio amplifier with uncompromised audio performance. Designed specifically for use with bi-amplified speaker systems, the power and performance of each channel is tailored for its intended load. An advanced high frequency power supply, utiliz

2、ing QSCs PowerWaveSwitching Technology, has been combined with the rugged audio amplificationcircuits of traditional QSC amplifiers to produce an amplifier with superb audio performance, reliability and thermal capacity. 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Phone: 714/754-6

3、175 Fax: 714/754-6174 Web: Email: PowerLight The low-frequency channel of the PowerLight 3.8Xis rated at 900 watts into 8 ohms, 1400 watts into 4 ohms, and 2400 watts into 2 ohms, making it ideal for powering stage monitors and any high- power bi-amplified speaker systems. PowerWaveTM Switching Tech

4、nologyincrease power supply regulation, maintaining excellent low frequency response down to 20 Hz.Outstanding audio performance and reliability, networkability, and light weight make this amplifier ideal for all critical sound system applications. Designed specifically for bi-amp applications 1400

5、watts (Low Frequency) at 4 2400 watts (Low Frequency) at 2 450 watts (High Frequency) at 8 800 watts (High Frequency) at 4 (guaranteed minimum specs) High efficiency, Class H, output circuit lowers AC current consumption and cooling requirements by 40% or more Optional BusCard allows the addi- tion

6、of built-in accessories such as crossovers or equalizers Advanced thermal management system Clip Limiter (user defeatable) reduces distortion, protects speakers PowerWaveSwitching Technologyfor improved audio performance Detented gain controls with 2 dB steps for easy resetting Comprehensive LED sta

7、tus arrays Variable speed fan, for quiet operation DC, sub audio, and thermal overload protection Patented Output Averaging short-circuit protection Neutrik ”Combo“ (XLR CH 2: 1.24 Vrms (-4.1 dBu), for rated power (8 ohms) CONTROLS: Front: AC Switch, Ch 1 and Ch 2 Gain Knobs, Ch 1 and Ch 2 Clip Limi

8、ter Switches Back: Remote A.C. Power Control Terminal Strip VOLTAGE GAIN: CH 1: 80 x(38 dB); CH 2: 49x(34 dB) INPUT IMPEDANCE: 10K unbalanced, 20K balanced INDICATORS: PROT:Red LEDCLIP:Red LED, 1 per channel STANDBY:Yellow LEDLEVEL -10:Yellow LED, 1 per channel PWR-ON:Green LEDLEVEL -20:Yellow LED,

9、1 per channel SIG-PRESENT:Green LED, 1 per channel CONNECTORS: (each channel) Input: Barrier strip and Neutrik “Combo” XLR and 1/4” input Output: “Touch proof” binding posts Data Port: HD15 female COOLING: Variable speed fan, rear-to-front air flow. AMPLIFIER PROTECTION: Full short circuit, open cir

10、cuit, thermal, ultrasonic, and RF protection. Stable into reactive or mis- matched loads. LOAD PROTECTION: On/off muting. DC-fault power supply shut down. OUTPUT CIRCUIT TYPE: CH 1: Complementary linear outputs. 3-step high efficiency circuit. CH 2: Complementary linear outputs. 2-step high efficien

11、cy circuit. POWER REQUIREMENTS:120, 230 VAC, 50-60 Hz 120V POWER CONSUMPTION: Multiply currents by 0.5 for 230V units. *Pink noise DIMENSIONS: 19.0 (48.3 cm) rack mounting 5.25 (13.3 cm) tall (3 spaces) 17.9 (45.5 cm) deep (rear support ears) WEIGHT: 30 Ibs (13.6 kg) net, 36 Ibs (16.3 kg) shipping O

12、utput Averaging TMshort circuit protection (US Patent 4,321,554) SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. PowerLight 3.8XSpecifications ARCHITECTS AND ENGINEERS SPECIFICATIONS The amplifier shall contain all solid-state circuitry, using complementary siliconoutput devices. The higher-powered

13、 of the two channels shall use a three-step Class H configuration and shall exceed the efficiency of an ordinary class-B linear output circuit. The lower-powered channel shall use a two-step Class H configuration. The amplifier shall operate from 50-60Hz AC power. The amplifier shall operate from a

14、30A 120V AC outlet, drawing less than 2550 VA when driven with random program material at 1/8 rated power into two ohm loads. The amplifer shall be supplied with a single molded AC cord having an appropriate AC plug for 120 V units; 220-240 V units shall be equipped with a 320-C19 16A IEC mains conn

15、ector and a removable power cord. The amplifier shall comply with FCC part 15 class B requirements. The amplifier shall employ forced-air cooling with a variable speed fan for minimum acoustic noise. Air flow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall

16、be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power, into four-ohm loads, for ambient temperatures up to 104F (40C). The amplifier shall contain two independent amplifier channels and a switching power supply. All ampl

17、ifier protection systems shall be self-resetting upon removal of fault. Each channel shall have independent protective circuitry against short circuit or mismatched loads. Each channel shall monitor heat sink temperature and shall trigger fan speed boost, and if necessary, signal muting to prevent e

18、xcessive temperature rise. Both channels shall have synchronized on-off muting, acting for three seconds after turn-on, and within 1/4 second after turn-off or loss of AC power. Each channel shall have DC fault protection for the load, consisting of a power supply shutdown. Each channel shall have a

19、 user-defeatable clip limiter. The channels shall be configured for bi-amp usage, suitable for use with an external or internal active crossover. Channel 1 shall be designated the “low frequency” channel, and Channel 2 the “high frequency” channel. The front panel shall contain the AC power switch;

20、a green LED power-on indicator; a yellow LED standby indicator and a red protect mode indicator.Each channel shall have the following controls and displays: A front panel detented gain control, with 11 gain settings (Low Frequency channel: 38 dB, 36 dB, 34 dB, 32dB, 30 dB, 28 dB, 26 dB, 24 dB, 20 dB

21、, 16 dB, -; High Frequencychannel: 34 dB, 32 dB, 30 dB, 28 dB, 26 dB, 24 dB, 20 dB, 18 dB, 14 dB, 12 dB, 10 dB, -); a recessed front panel clip limiter defeat switch; a green signal present LED triggering at -30 dB; two yellow LED output indicators,triggering at -20 dBand -10 dB; a red LED showing t

22、rue amplifier clipping. The output connectors for each channel shall be “touchproof” binding post, accepting banana plug or up to 7 AWG (4mm2) wire. The rear panel input shall provide barrier strip and Neutrik “Combo” connectorsfor each channel. The XLR input shall be wired with pin 2 high, the 1/4

23、TRSinput shall be wired with tip positive, ring negative, and sleeve grounded. Inputs shall be electron- ically balanced, with a minimum impedance of 10 kilohmsper side, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz. A High Density 15 Pin Data Port connector shall carry both aud

24、io and amplifier operational status signals to and from a QSC MultiSignal Processor. A two-position barrier strip on the rear panel shall be used for remote Power Supply Enable; a contact closure shall place the both amplifier channels in standby mode, when the front panel power switch is in the on

25、position. The front panel power switch shall function as a master switch that removes all AC power. The channels shall be capable of meeting the following performance criteriawith both channels driven: sine-wave output power of 900 watts (Low Frequency) and 450 watts (High Frequency) into 8 ohms, an

26、d 1400 watts (Low Frequency) and 800 watts (High Frequency) into 4 ohms, 20 Hz to 20 kHz, with lessthan 0.1% THD. Power into 2-ohm loads shall be 2400 watts (Low Frequency)and 1400 watts (High Frequency), at 1 kHz and no more than 1% THD. Frequencyresponse at 3 dB below rated power shall be 20 Hz to

27、 20 kHz within 0.15 dB.The voltage gain of the low frequency channel shall be 80, equivalent to 38 dB,and the input sensitivity shall be 1.08 Vrms. The voltage gain of the high frequency channel shall be 49, equivalent to 34 dB, and the input sensitivity shallbe 1.24 Vrms. The signal to noise ratio

28、over the range of 20 Hz to 20 kHz shall exceed 105 dB relative to full output. IHF damping factor shall exceed 500. The amplifier chassis shall occupy three rack spaces, with provision for securingthe rear corners. Depth from mounting surface to tips of rear supports shall be17.9 (45.5 cm). Weight s

29、hall not exceed 30 lbs. (13.6 kg.). The amplifier shall be the QSC AudioProducts PowerLight3.8X. LOAD NORMAL PROGRAM MAX PROGRAM MAX SINEWAVE 1/8 POWER* 1/3 POWER* 1% CLIPPING 8 ohms11.0 A18.8 A35.8 A 4 ohms15.2 A27.4 A57.6 A 2 ohms21.2 A40.0 A83.2 A 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Phone: 714/754-6175 Fax: 714/754-6174 web: Email: RadioFans.CN 收音机爱 好者资料库