Qsc - Pl403 电路图.pdf

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1、he PowerLight 4.0 is an advanced professional audio amplifier featuring uncompromised audio performance and light weight. A new high frequency power supply, utilizing QSCs PowerWave Switching Technology, has been combined with the rugged audio amplification circuits of traditional QSC amplifiers to

2、produce an amplifier with incred- ible reliability, thermal capacity and audio performance. The PowerLight 4.0 is rated at 1000 PowerLight watts/channel into 8 ohms, 1600 watts/channel into 4 ohms, and 2000 watts/channel into 2 ohms, making it ideal for powering subwoofers and high power, passive fu

3、ll-range speaker systems. Increased power supply regulation to maintain excellent low impedence performance. Outstanding audio performance and reliability, high efficiency design, networkability, and light weight make this amplifier ideal for all critical sound system applications. 2000 watts per ch

4、annel at 2 ohms 1600 watts per channel at 4 ohms (guaranteed minimum spec) Advanced thermal management system Clip limiter (user defeatable) reduces distortion, protects speakers PowerWave Switching Technologyfor improved audio performance Detented gain controls with 2 dB steps for easy resetting Co

5、mprehensive LED status arrays High efficiency, 3-step output circuit for improved thermal performance and lower AC current consumption Variable speed fan, for quiet operation DC, subsonic audio, and thermal overload protection Patented Output Averaging short- circuit protection Neutrik ”Combo“ (XLR

6、220-240 V units shall be equipped with a 320-C19 16A IEC mains connec- tor 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

7、front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be ca- pable of continuous operation at 1/3 power into four-ohm loads, in ambi- ent temperatures up to 104 F (40 C). The amplifier shall contain

8、two independent amplifier channels on sepa- rate printed circuit boards, each with separate and synchronized switch- ing power supplies. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have protec- tive circuitry against short circu

9、it or mismatched loads. Each channel shall independantly monitor heat sink temperature and shall trigger fan speed boost, and if necessary, signal muting to prevent excessive temperature rise. Both channels shall have synchronized on-off muting, acting for three seconds after turn-on, and within 1/4

10、 second after turn-off or loss of AC power. Each channel shall have DC fault protection for the load, consist- ing of a synchronized shutdown of each amplifier channels power supply. The front panel shall contain the AC power switch; a green LED power-on indicator; a yellow LED standby indicator and

11、 a red protect mode indica- tor. Each channel shall have the following controls and displays: A front panel detented gain control, with 11 gain settings: 38 dB, 36 dB, 34 dB, 32 dB, 30 dB, 28 dB, 26 dB, 24 dB, 20 dB, 16 dB, -; a recessed front panel clip limiter defeat switch; a green signal present

12、 LED triggering at -30 dB; two yellow LED output indicators, triggering at -20 dB and -10 dB; a red LED showing true amplifier clipping. The output connectors for each channel shall include a “touch proof” bind- ing post, accepting banana plug or up to 7 AWG (4mm) wire. Connector terminals are arran

13、ged to allow bridge mono connection. The rear panel input shall provide barrier strip and Neutrik “Combo” con- nectors for each channel. The XLR input shall be wired with pin 2 high, the 1/4 RTS input shall be wired with tip positive, ring negative, and sleeve grounded. Inputs shall be electronicall

14、y balanced, with a minimum impedance of 10 kilohms per 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 audio and am- plifier operational status signals to and from a QSC MultiSignal Proces- sor. Switches shall be pr

15、ovided for stereo-bridging and parallel inputs. 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 position. The front panel power swi

16、tch shall function as a master switch that re- moves all AC power. Each channel shall be capable of meeting the following performance cri- teria with both channels driven: Sine-wave output power of 900 watts into eight ohms, and 1400 watts into four ohms, 20 Hz to 20 kHz, with less than 0.1% THD. Fr

17、equency response at 3 dB below rated power shall be 20 Hz to 20 kHz within 0.15 dB. The voltage gain shall be 80, equivalent to 38 dB, and the input sensitivity shall be 1.06 Vrms. The signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 108 dB relative to full output. IHF damping fa

18、ctor shall exceed 500. The amplifier chassis shall occupy three rack spaces, with provision for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 17.9 (45.5 cm). Weight shall not exceed 30 lbs. ( 13.6 kg.). The amplifier shall be the QSC Audio Products PowerLight 4.0. RadioFans.CN 收音机爱 好者资料库