Jbl MPA275 Bedienungsanleitung

Power AmplifiersMPA SeriesMPA275P r o f e s s i o n a l A m p l i f i e rClip-10dB-20dBSignal PresentClip-10dB-20dBSignal Present PowerProtect1-CHANNE

9AC Power ConnectionAC Connection is made through a standard Schuko or NEMA grounded plug. Whileall models meet Safety Agency requirements for current

10OperationTable 1. JBL MPA-Series AC Power Consumption vs Load Impedance With 110, 115 and 120V Mains2 CH Load Max Power AC Current AC Current AC Cur

11OperationTable 2. JBL MPA-Series AC Power Consumption vs Load Impedance With 220, 230 and 240V Mains2 CH Load Max Power AC Current AC Current AC Cur

12ControlsThe front-mounted Gain controls have 11 detents for easy matching of levels. TheGain scale showsdB of attenuation from full gain, with posit

13Clip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal Present

14Maximum Long-Term Output PowerIn most cases, the desired sound level can be obtained without using the full poweroutput of the amplifier. The level d

15Operationextended somewhat, and the turn-off muting has been quickened, to ensure mutingeven of poorly designed preceding components. On/off muting

16SMPTE-IM, less than 0.05 %20Hz to 20kHz, ±0.1dB8Hz to 100kHz, +0/-3dBGreater than 2003dB at 4 ohms (2 dB for MPA275)100dB below rated output (20Hz t

17SpecificationsLoad & Measure-ment ConditionsOutput RMS Power in Watts8 ohms/channel20 Hz – 20 kHz0.1% THDMPA1100 MPA750 MPA600 MPA400 MPA27545047

18Specifications*Amplifier’s output protective circuitry prevents full power output above 15kHz.Specifications subject to change without notice.Load &

1Rack Mounting PrecautionsTo avoid damage to the amplifier mounting earsand/or rack rails, the amplifier must be supported at allfour corners when used

19Channel will not come out of muting: A. If reducing Gain to zero does not release muting, the channel is defective oroverheated (see below). B. If r

20TroubleshootingOverheating:A. If ventilation is blocked, or if the amplifier is overdriven into low impedanceloads, it can overheat. The thermal prot

21General information or Technical AssistanceFor more information on JBLproducts, including these power amplifiers, contact yournearest JBL professiona

Part No. TD-007500-OB/PS137-2A Harman International CompanyJBL Incorporated8500 Balboa BoulevardNorthridge, California 91329USA

2Cautions ...1Unit Description ...

3The MPA275, MPA400, MPA600, MPA750 and MPA1100 are high-efficiency profession-al power amplifiers, with two independent channels, respectively capable

4SENSITIVITY1 VOLTIMPEDANCE20K BAL10K UNBALGNDP1P3PARALLELSTEREOBRIDGEP2 CHANNEL 1INPUTGND+– –+GNDP1P3P2 CHANNEL 2CHANNEL 1OUTPUT– BRIDGED MONO +

5InstallationFigure 4. Neutrik Speakon Connector Wiring for Speaker OutputsExploded view (side)Connection TerminalsInputsBalanced input connections ar

Xx6Input ConnectionsFigure 5. Typical Unbalanced ConnectionTo connect an unbalanced source to the input of an MPA amplifier, “+” should beconnected to

7Changing the XLR polarityThe MPA275, MPA400, MPA600, MPA750 and MPA1100 are shipped with XLR polarityset at pin 2 high. To convert to pin 3 high:1. R

8InstallationWith paralleled inputs, the signal may be looped through (or “daisy-chained”)by going in one channel’s inputs and out the other. The ampl