JBL MPA1100 Owner's Manual
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JBL MPA1100 Owner's Manual

Mpa series power amplifier
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MPA275
MPA400
MPA600
MPA750
MPA1100
MPA Series
Owner's Manual
Clip
MPA275
P r o f e s s i o n a l A m p l i f i e r
-10dB
-20dB
Signal Present
12
14
18
24
48
Clip
MPA400
P r o f e s s i o n a l A m p l i f i e r
-10dB
-20dB
Signal Present
12
14
18
24
48
Clip
MPA600
P r o f e s s i o n a l A m p l i f i e r
-10dB
-20dB
Signal Present
12
14
18
24
48
MPA750
P r o f e s s i o n a l A m p l i f i e r
Clip
-10dB
-20dB
Protect
Signal Present
Power
10
12
8
14
6
18
4
24
2
1-CHANNEL-2
48
0
MPA1100
P r o f e s s i o n a l A m p l i f i e r
Clip
-10dB
-20dB
Protect
Signal Present
Power
10
12
8
14
6
18
4
24
2
1-CHANNEL-2
48
0
Power Amplifiers
Clip
-10dB
Protect
-20dB
Power
Signal Present
10
10
8
8
12
6
14
6
18
4
4
2
24
2
1-CHANNEL-2
0
48
0
Clip
-10dB
Protect
-20dB
Power
Signal Present
10
10
8
12
8
6
14
6
4
18
4
24
2
2
1-CHANNEL-2
0
48
0
Clip
-10dB
Protect
-20dB
Power
Signal Present
10
10
8
8
12
6
14
6
18
4
4
2
24
2
1-CHANNEL-2
0
48
0
Clip
-10dB
-20dB
Signal Present
10
12
8
14
6
18
4
24
2
48
0
Clip
-10dB
-20dB
Signal Present
10
12
8
14
6
18
4
24
2
48
0

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Summary of Contents for JBL MPA1100

  • Page 1 Owner’s Manual MPA275 MPA275 MPA400 MPA400 MPA600 MPA600 MPA750 MPA750 MPA1100 MPA1100 Clip P r o f e s s i o n a l A m p l i f i e r -10dB -10dB -20dB Protect -20dB Signal Present...

  • Page 2: Cautions

    To avoid damage to the amplifier mounting ears and/or rack rails, the amplifier must be supported at all four corners when used in portable racks. Consult JBL Service Dept for availability of Rear Support Brackets. Lifting Precautions In order to safely move or install the amplifier, it is recommended that two persons share the weight when lifting and positioning the unit.

  • Page 3: Table Of Contents

    Figure 14. LED Displays During Normal Operation ...13 Figure 15. LED Displays During Abnormal Operating Conditions ...13 Tables Table 1. JBL MPA Series AC Power Consumption Table 2. JBL MPA Series AC Power Consumption Table 3. LED Display Operation ...11 Table 4.

  • Page 4: Unit Description

    Semi-toroidal power trans- formers (one per channel in the MPA750 and MPA1100) are mounted in each front corner, as close as possible to the rack ears and rails. The rear panels are 16.9 inches behind the front mounting plane, so an extra rack depth allowance (i.e., more than...

  • Page 5: Feature Identification

    Models (MPA275, MPA400 & MPA600) Figure 3. Rear and Front Panel for 3–Space High Models (MPA750 and MPA1100) Rear Panel Features 1. Upper Input Slot 2. Upper Input Cover Panel 3. Slot Product Mounting Screws 4. Lower Input Slot 5. Standard Input Board 6.

  • Page 6: Installation

    Input sensitivity is 1 Vrms, and impedance is 20 kilohm balanced, 10 kilohm unbalanced, as is typical of JBL amplifiers. The input jacks are located on a removable panel which has a toggle switch for (1) bridged-mono (2) normal stereo, or (3) paralleling the inputs. See page 2 for more information about the Open Input Architecture slots.

  • Page 7: Input Connections

    Input Connections To connect an unbalanced source to the input of an MPA 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. In a portable system using a source unit with balanced outputs, a standard XLR cable wired pin to pin (with pin 1 connected to the shield at both ends) should be used.

  • Page 8: Changing Xlr Polarity

    Installation Changing the XLR polarity The MPA275, MPA400, MPA600, MPA750 and MPA1100 are shipped with XLR polarity set at pin 2 high. To convert to pin 3 high: Caution: The XLR polarity changes as outlined on this page should only be done by qualified personnel with...

  • Page 9: Bridged Mono Mode

    Mittelwert von 15j0 Volt zwischen den überbrückten Terminals (103 Volt bei einer Belastung von 8 Ohm). Zu verwenden ist voll isolierte Verdrahtung der US-Klasse Eins, und die angeschlossene Belastung muß für bis zu 2400 Watt (8 Ohm) beim MPA1100, 1500 Watt beim MPA750 und 1330 Watt (8 Ohm) beim MPA600 ausgelegt sein. Obwohl die Leistung beim MPA400 und MPA275 etwas geringer ist, sind die Sicherheitsvorschriften dennoch einzuhalten.

  • Page 10: Ac Power Connection

    The AC consumption for each power level and load impedance is shown in The safety agencies are concerned with the current levels shown under the one JBL Engineering standards call for ability to operate at one third power, in order...

  • Page 11: Operation

    450 x 2 650 x 2 200 x 2 MPA275 325 x 2 500 x 2 Table 1. JBL MPA-Series AC Power Consumption vs Load Impedance With 110, 115 and 120V Mains AC Current AC Current Full Power 1/3 Power 23.0 A 10.2A...

  • Page 12: Table 2. Jbl Mpa Series Ac Power Consumption

    450 x 2 650 x 2 200 x 2 MPA275 325 x 2 500 x 2 Table 2. JBL MPA-Series AC Power Consumption vs Load Impedance With 220, 230 and 240V Mains AC Current AC Current Full Power 1/3 Power 11.5 A 5.1A...

  • Page 13: Controls

    Operation Controls The front-mounted Gain controls have 11 detents for easy matching of levels. The Gain scale shows 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 -14 dB).

  • Page 14: Figure 14. Led Displays During Normal Operation

    Operation NO SIGNAL Clip -10dB -20dB Protect Signal Present Power SIGNAL PRESENT (-30 dB) Clip -10dB -20dB Protect Signal Present Power LEVEL -20 dB Clip -10dB -20dB Protect Signal Present Power LEVEL -10 dB Clip -10dB -20dB Protect Signal Present Power CLIPPING Clip...

  • Page 15: Maximum Long-Term Output Power

    The essence of high-efficiency, lighter-weight designs is to control more power with fewer or smaller load-bearing components. The MPA275, MPA400, MPA600, MPA750 and MPA1100 represent a considerable step forward, with high efficiency due to the multi-step power supplies. Because of the higher power flow, effective protection circuits become even more important.
  • Page 16 Operation extended somewhat, and the turn-off muting has been quickened, to ensure muting even of poorly designed preceding components. On/off muting is equally effective whether the amplifier is turned off with its own switch or with a remote switch. which starts at a high resistance and then diminishes after turn-on to avoid loss of power.

  • Page 17: Specifications

    MPA1100 & MPA750 are 13.3 cm (5.25") high (3 spaces); MPA600, MPA400 & MPA275 are 8.9 cm (3.5") high (2 spaces) WEIGHT MPA1100: 29 kg (64 lbs) net, 31.8 kg (70 lbs) shipping MPA750: 24.9 kg (55 lbs) net, 26.8 kg (59 lbs) shipping MPA600: 20 kg (44 lbs) net, 22.2 kg (49 lbs) shipping...

  • Page 18: Power Output Ratings

    110 VAC 1 kHz 115 VAC 0.1% THD, 1 dB 120 VAC Table 4. Output Power Ratings When Used With 110, 115 & 120 VAC 60 Hz Mains Output RMS Power in Watts MPA1100 MPA750 MPA600 1000 1100 1000 1100...
  • Page 19 Table 5. Output Power Ratings When Used With 220, 230 & 240 VAC 50 Hz Mains *Amplifier’s output protective circuitry prevents full power output above 15 kHz. Specifications subject to change without notice. Output RMS Power in Watts MPA1100 MPA750 MPA600 1000...

  • Page 20: Troubleshooting

    (3) there is an open circuit in the internal output wiring of the amplifier. (Consult a JBL dealer for service.) If there is no LEVEL (SIGNAL PRESENT, -20dB, -30dB) or CLIP displays, (1) there is no input signal, or (2) the ribbon cable to the input module may not be seated well.
  • Page 21 Troubleshooting Overheating: 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.
  • Page 22 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. You may obtain that authorization by contacting the factory or repair facility directly.
  • Page 23 JBL Incorporated 8500 Balboa Boulevard Northridge, California 91329USA Part No. TD-007500-OB/PS137-2 A Harman International Company...

This manual is also suitable for:

Mpa275Mpa400Mpa600Mpa750

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