JBL MPA1100 manuale d’uso

Power Amplifier s M P A Series MPA275 P r o f e s s i o n a l A m p l i f i e r Clip -10dB -20dB Signal Present Clip -10dB -20dB Signal Present Power Protect 1-CHANNEL-2 18 10 8 6 4 12 14 24 0 2 48 18 10 8 6 4 12 14 24 0 2 48 MPA400 P r o f e s s i o n a l A m p l i f i e r Clip -10dB -20dB Signal Present Clip -10dB -20dB Signal Present Power Prot[...]

1 Rack Mounting P r ecautions T o avoid damage to the amplifier mounting ears and/or rack rails, the amplifier must be supported at all four co r ners when used in portable racks. Consult JBL Service Dept for availability of Rear Support Brackets. Lifting P r ecautions In order to safely move or install the amplifie r , it is recommended that tw[...]

2 Cautions .................................................................................................................1 Unit Description ....................................................................................................3 General Information .....................................................................................[...]

3 The MP A275, MP A400, MP A600, MP A750 and MP A1100 are high-efficiency profession- al power amplifiers, with two independent channels, respectively capable of deliver- ing 275, 400, 600, 750 and 1100 watts into a four ohm load (per channel), and substantially more power into lower impedance loads. Semi-toroidal power trans- formers (one per cha[...]

4 SENSITIVITY 1 VOLT IMPEDANCE 20K BAL 10K UNBAL GND P1 P3 PARALLEL STEREO BRIDGE P2 CHANNEL 1 INPUT GND +– – + GND P1 P3 P2 CHANNEL 2 CHANNEL 1 OUTPUT – BRIDGED MONO + CHANNEL 2 OUTPUT + BRIDGED MONO 8 OHM MIN – CH 2 CH 1 DUAL CHANNEL OUTPUT CONNECTOR STEREO 4 OHM MIN PER CH SENSITIVITY 1 VOLT IMPEDANCE 20K BAL 10K UNBAL GND P1 P3 PARALLEL[...]

5 Installation Figure 4. Neutrik Speakon Connector Wiring for Speaker Outputs Exploded view (side) Connection T erminals Inputs Balanced input connections are available via barrier strip or XLR connectors. The unit is shipped with pin 2 high (see subsequent instructions to change polarity). As usual, for unbalanced inputs, the unused terminal shoul[...]

Xx 6 Input Connections Figure 5. T ypical Unbalanced Connection T o connect an unbalanced source to the input of an MP A amplifier , “+” should be connected to pin 2, and “-” to pin 3 The “-” terminal should also be connected to the shield at the source only. Pin 1 should not be connected at the amplifier . Figure 6. Portable Balanced[...]

7 Changing the XLR polarity The M P A275, M P A400, M P A600, M P A750 and M P A1100 are shipped with XLR polarity set at pin 2 high. T o convert to pin 3 high: 1. Remove the Standard Input Module and input ribbon cable. (See Figure 1). 2. Find the soldered jumpers W303, W304 (Ch 1) and W403, W404 (Ch 2), located behind each XLR jack. These are sol[...]

8 Installation W ith paralleled inputs, the signal may be looped through (or “daisy-chained”) by going in one channel’s inputs and out the othe r . The amplifier Gain settings will not affect the level at the input jacks. Bridged-Mono Mode 1. Locate the selector switch adjacent to the CHANNEL 1 input XLR connecto r , and set it to the BRIDGE[...]

9 AC Power Connection AC Connection is made through a standard Schuko or NEMA grounded plug. While all models meet Safety Agency requirements for current consumption of less than 12 amp, 12 0 V ac during “no r mal” operation, peak current consumption can be higher on the M P A1100 or M P A750. The amplifiers can be wired for 100, 120, or 220?[...]

10 Operation T able 1. JBL M P A-Series AC Power Consumption vs Load Impedance With 110, 115 and 120V Mains 2 CH Load Max Power AC Cur r ent AC Cur r ent AC Cur r ent AC Cur r ent Model (Ohms) (Midband) Full Power 1/3 Power 1/8 Power Idle 8+8 740 x 2 23.0 A 10.2A 5.4 A M P A1100 4+4 1000 x 2 38.0 A 16.0 A 7.8 A 0.9 A 2+2 1300 x 2 54.0 A 23.0 A 11.4[...]

11 Operation T able 2. JBL MP A-Series AC Power Consumption vs Load Impedance With 220, 230 and 240V Mains 2 CH Load Max Power AC Curr ent AC Current AC Current AC Current Model (Ohms) (Midband) Full Power 1/3 Power 1/8 Power Idle 8+8 740 x 2 11.5 A 5.1A 2.7 A MP A1100 4+4 1000 x 2 19.0 A 8.0 A 3.9 A 0.5 A 2+2 1300 x 2 27.0 A 11.5 A 5.7 A 8+8 480 x[...]

12 Cont r ols The front-mounted Gain controls have 11 detents for easy matching of levels. The Gain scale show s dB of attenuation from full gain, with positions for 0 (full), -2, -4, -6, -8, -10, -12, -14, 18, -24, and ∞ (full off). Attenuation is accurate within 1 dB (down to -1 4 dB). Gain Cont r ol Lockout Provided with each amplifier are tw[...]

13 Clip -10dB -20dB Signal Present Protect Power Clip -10dB -20dB Signal Present Protect Power Clip -10dB -20dB Signal Present Protect Power Clip -10dB -20dB Signal Present Protect Power Clip -10dB -20dB Signal Present Protect Power ON/OFF MUTING SHORTED LOAD CLIPPING OVERHEATING THERMAL MUTING Not Illuminated Full Brightness Variable or Occasional[...]

14 Maximum Long- T e r m Output Power In most cases, the desired sound level can be obtained without using the full power output of the amplifie r . The level displays are then used to confi r m that both chan- nels are working as desired. If the amplifier is operated at extreme power levels, it may overheat or the speakers may be damaged. The f[...]

15 Operation extended somewhat, and the tu r n-off muting has been quickened, to ensure muting even of poorly designed preceding components. On/off muting is equally effective whether the amplifier is tu r ned off with its own switch or with a remote switch. Inrush current is limited by an NTC resistor (Negative T emperature Coefficient) which sta[...]

16 SMPTE-IM, less than 0.05 % 2 0 Hz to 2 0 kHz, ±0. 1 dB 8 Hz to 10 0 kHz, +0/- 3 dB Greater than 200 3 dB at 4 ohms (2 dB for M P A275) 10 0 dB below rated output (2 0 Hz to 2 0 kHz) 1 V r ms for rated power (8 ohms) M P A1100: 80 (38 dB) M P A750: 63 (36 dB) M P A600: 56 (35 dB) M P A400: 45 (33 dB) M P A275: 35.5 (31 dB) 10 kilohms unbalanced,[...]

17 Specifications Load & Measure- ment Conditions Output RMS Power in Watts 8 ohms/channel 20 Hz – 20 kHz 0.1% THD MPA1100 MPA750 MPA600 MPA400 MPA275 450 475 500 350 375 400 250 260 275 160 170 175 8 ohms/channel 20 Hz – 15 kHz * 0.1% THD 4 ohms/channel 20 Hz – 20 kHz 0.1% THD 4 ohms/channel 20 Hz – 15 kHz * 0.1% THD 8 ohms/channel 1 [...]

18 Specifications *Amplifier’s output protective circuitry prevents full power output above 1 5 kHz. Specifications subject to change without notice. Load & Measure- ment Conditions Output RMS Power in Watts 8 ohms/channel 20 Hz – 20 kHz 0.1% THD MPA1100 MPA750 MPA600 MPA400 MPA275 450 475 500 350 375 400 250 260 275 160 170 175 8 ohms/c[...]

19 Channel will not come out of muting: A. If reducing Gain to zero does not release muting, the channel is defective or overheated (see below). B. If reducing Gain releases the muting, advance Gain slowly while watching the LEVEL displays (in case there is an abnormal signal which could blow the speakers). No sound is heard: A. Is the channel in m[...]

20 T roubleshooting Overheating: A. If ventilation is blocked, or if the amplifier is overdriven into low impedance loads, it can overheat. The thermal protection system’s normal response to rising temperatures is as follows: 25–50° C: Fan runs on low speed. 50–60° C: Fan Speed rises gradually from slow to full. 75° C: PROTECT LED starts [...]

21 General info r mation or T echnical Assistance For more info r mation on JB L products, including these power amplifiers, contact your nearest JBL professional products dealer or the JBL factory at the address below. Repairs Please do not ship your amplifier(s) to JBL or a JBL authorized repair facility without prior authorization. Y ou may ob[...]

Pa r t No. TD-007500-OB/PS137-2 A Ha r man Int e r national Co mpany JBL Incorporated 8500 Balboa Boulevard Northridge, Califo r nia 91329USA[...]