Qsc - Pl34 电路图.pdf

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1、FEATURES 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Ph: 714/754-6175 Fax: 714/754-6174 Web: E-mail: PowerLight? T PowerLightPowerLightPowerLightPowerLightPowerLight 3.43.43.43.43.4 he PowerLight 3.4 is an advanced professional audio amplifier featuring uncompromised audio perform

2、ance. 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 produce an amplifier with incredible reliability, thermal capacity, and audio performance. The PowerLight 3.4 is rat

3、ed at 750 watts/channel into 8 ohms, 1225 watts/ 1700 watts per channel at 2 ohms 1225 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 perfor

4、mance Detented gain controls with 2 dB steps for easy resetting Comprehensive LED status arrays High efficiency, 3-step output circuit for improved thermal performance and lower AC current consumption120V units work on standard outlets Variable speed fan, for quiet operation DC, subsonic audio, and

5、thermal overload protection Patented Output Averaging short-circuit protection Neutrik ”Combo“ (XLR a green LED power-on indicator; a yellow LED standby indicator and a red protect mode indica- tor. Each channel shall have the following controls and displays: A front panel detented gain control, wit

6、h 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 LED triggering at -30 dB; two yellow LED output indicators, triggering at -20 dB and -10 dB; a red LED showing true amplifier clippin

7、g. The output connectors for each channel shall be “touchproof” binding posts, accepting banana plugs or up to 7 AWG (4 mm dia.) wire. Connec- tor terminals are arranged to allow bridge mono connection. The rear panel input shall provide barrier strip and Neutrik “Combo” con- nectors for each channe

8、l. The XLR input shall be wired with pin 2 high, the TRS input shall be wired with tip positive, ring negative, and sleeve grounded. Inputs shall be electronically balanced, with a minimum im- pedance of 10 kilohms per side, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz. A High

9、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 provided for stereo-bridging and parallel inputs. A two- position barrier strip on the rear panel shall be used for remote Power Supply En

10、able; a contact closure shall place both amplifier channels in standby mode, when the front panel power switch is in the on position. The front panel power switch shall function as a master switch that removes all AC power. Each channel shall be capable of meeting the following performance cri- teri

11、a with both channels driven: Sine-wave output power of 725 watts into eight ohms, and 1150 watts into four ohms, 20 Hz to 20 kHz, with less than 0.1% THD. Frequency 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

12、input sensitivity shall be 0.96 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 factor shall exceed 500. The amplifier chassis shall occupy three rack spaces, with provision for securing the rear corners. Depth from mounting

13、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 3.4. The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall exceed the efficien

14、cy of an ordinary class-B linear output circuit. The amplifier shall operate from 5060 Hz AC power. The amplifier shall operate from a 15A 120V AC outlet, drawing less than 1380 VA when driven with random program material at 1/8 rated power into four ohm loads. The amplifier shall be supplied with a

15、 single molded AC cord having a standard NEMA 15 AC plug for 120 V units; 220-240 V units shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. The amplifier shall comply with FCC part 15 Class B requirements. STANDBY POWER SUPPLY CONTROL TM TM INPUT IMPEDANCE 20K BALA

16、NCED 10K UNBALANCED INPUT SENSITIVITY POWERLIGHT 1.0=1.01V POWERLIGHT 1.4=1.00V POWERLIGHT 1.8=1.16V POWERLIGHT 3.4=0.99V POWERLIGHT 4.0=1.08V CLIP LIMITER: RECESSED PUSH SWITCHES ARE LOCATED ON THE FRONT PANEL. CLIP LIM OFF CLIP LIM ON CERTIFIED TO COMPLY WITH CLASS B LIMITS PART 15 OF FCC RULES SEE INSTRUCTIONS IF INTERFERENCE TO RADIO RECEPTION IS SUSPECTED QSC AUDIO PRODUCTS INC. ENABLE POWERWAVE INPUT INPUT STEREO PARALLEL BRIDGE CH 1 CH 2 SLV RING TIP P2P1 P3 SLV RING P2P1 P3 D A T A P O R T OUTPUT OUTPUT BRIDGED MONO BRIDGED MONO CH 1 CH 2 RadioFans.CN 收音机爱 好者资料库