JBL MPA1100 Скачать руководство пользователя страница 15

14

Maximum Long-Term Output Power

In most cases, the desired sound level can be obtained without using the full power
output of the amplifier. The level displays are then used to confirm 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 following guidelines will help you determine how
much power can be delivered to the speakers without thermal limiting (which is
indicated by flashing of the red PROTECT display).

8 Ohm Loads

The amplifier can be played at practically any volume without overheating.

However, if the amplifier is pushed into continuous triggering of the CLIP display, the
average output power can reach higher levels than more most speakers will take. 

4 Ohm Loads

The amplifier’s maximum long-term power capacity will be reached when the

LEVEL -10 is on almost all the time, with occasional flashing of the CLIP display. If
the CLIP display is on half the time, the amplifier is liable to start indicating thermal
limits are being approached in a few minutes (full brightness flashing of the PRO-
TECT LED). 

2 Ohm Loads

To avoid overheating on those models rated at 2 ohms (see Specifications), the

LEVEL -10 display should not be on more than about half the time, with only occa-
sional clipping. 

Protection Circuits

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.

The inputs are resistively buffered for overload and RF protection. Chassis

bypass capacitors are installed at inputs and outputs to further improve RF rejection. 

All models have short circuit protection that is based on averaging the output

power. This protection circuit permits full output current into resistive or reactive 
2 ohm loads, but if the output is shorted, the current is cut back to a safe level of about
25%. 

Turn-on/off muting prevents transients from the amplifier or preceding devices

from reaching the speakers. The MPA275, MPA400, MPA600, MPA750 and MPA1100
use simultaneous relay and electronic muting to guarantee minimum possible on/off
noise. The limiter (see subsequent paragraphs) is fully activated during muting, so
that its release time cushions the onset of full volume. The turn-on delay has been

Operation

Содержание MPA1100

Страница 1: ...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 Clip 10dB 20dB...

Страница 2: ...HE RISK OF ELECTRIC SHOCK DO NOT REMOVE THE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL VORSICHT UM DAS RISIKO EINES ELEKTRISCHEN SCHLAGES ZU VERMINDERN ABDEC...

Страница 3: ...peaker Outputs 5 Figure 5 Typical Unbalanced Connection 6 Figure 6 Portable Balanced System 6 Figure 7 Installed Balanced System 6 Figure 8 Ground Bus Connection 6 Figure 9 Jumper Positions for XLR Po...

Страница 4: ...ort within the rack must be used in portable applica tions Open Input Architecture Slots Provided with each MPA Series amplifier is a standard input module This module and the upper input cover panel...

Страница 5: ...6 7 13 23 22 23 22 25 29 24 27 28 26 30 31 31 25 29 24 27 28 26 30 31 31 Figure 2 Rear and Front Panel for 2 Space High Models MPA275 MPA400 MPA600 Figure 3 Rear and Front Panel for 3 Space High Mode...

Страница 6: ...ce 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 paralle...

Страница 7: ...ld at the source with no connection to pin 1 at the amplifier If after wiring the input as shown above any hum or buzzing is present connect the GND terminals of all amplifiers together This bus shoul...

Страница 8: ...the rear panel 5 Install the input ribbon cable and remount the Standard Input Module securely To Parallel the Inputs 1 Locate the selector switch adjacent to the CHANNEL 1 input XLR connector and se...

Страница 9: ...MIN CH 2 CH 1 DUAL CHANNEL OUTPUT CONNECTOR STEREO 4 OHM MIN PER CH CONNECT ONE SPEAKER LOAD ONLY Use Either Binding Posts or Stereo Speakon but not both 2 2 1 1 BRIDGED MONO MODE CAUTION Output volt...

Страница 10: ...hese levels in perspective music played at one third average power will be in a state of constant clipping and this power level is about the greatest one can obtain without completely obliterating the...

Страница 11: ...1400 x 2 56 0 A 23 4 A 11 8 A 8 8 510 x 2 18 6 A 9 8A 4 8 A MPA750 4 4 760 x 2 30 0 A 14 8 A 6 8 A 0 8 A 2 2 1000 x 2 39 4 A 21 4 A 10 6 A 8 8 425 x 2 13 6 A 8 6 A 3 6 A MPA600 4 4 610 x 2 23 0 A 13 4...

Страница 12: ...A 2 2 1400 x 2 28 0 A 11 7 A 5 9 A 8 8 510 x 2 9 3 A 4 9A 2 4 A MPA750 4 4 760 x 2 15 0 A 7 4 A 3 4 A 0 4 A 2 2 1000 x 2 19 7 A 10 7 A 5 3 A 8 8 425 x 2 7 8 A 4 3 A 1 8 A MPA600 4 4 610 x 2 11 5 A 6 7...

Страница 13: ...proaches maximum tempera ture Illuminated steadily plus flashing during thermal muting Illuminated steadily during non thermal muting Typical Power Up Operation Power Down Behavior When the amplifier...

Страница 14: ...bnormal PROTECT may flash too CLIP flashing at full LEVEL display indicates the amp has reached full power clipping and the limiter is acting to prevent severe overdrive A steady CLIP glow after the f...

Страница 15: ...hose models rated at 2 ohms see Specifications the LEVEL 10 display should not be on more than about half the time with only occa sional clipping Protection Circuits The essence of high efficiency lig...

Страница 16: ...f 15 dB If this does not arrest the temperature rise in case of an output short or blocked ventilation the amplifier will finally enter full muting which causes full shutdown of the output bias circui...

Страница 17: ...oad grounding relay with internal fault fuses Complementary linear high efficiency outputs 3 step on MPA1100 2 step on MPA750 MPA600 MPA400 1 step on MPA275 100 120 220 240 Vac 50 60 Hz See Charts on...

Страница 18: ...720 650 700 750 500 550 600 350 375 400 225 250 275 900 1000 1100 480 510 550 400 425 450 275 290 300 180 190 200 740 770 800 700 760 825 550 610 675 400 425 450 275 300 400 1000 1100 1200 900 950 100...

Страница 19: ...1 THD 1 dB 50 Hz AC Power Mains 220 VAC 230 VAC 240 VAC 660 690 720 220 VAC 230 VAC 240 VAC 650 700 750 500 550 600 350 375 400 225 250 275 220 VAC 230 VAC 240 VAC 900 1000 1100 220 VAC 230 VAC 240 VA...

Страница 20: ...TECT display is visible amplifier has muted due to extreme overheating Fan should be running at full speed and unless ventila tion is blocked operation should resume within one minute B The amplifier...

Страница 21: ...speed 50 60 C Fan Speed rises gradually from slow to full 75 C PROTECT LED starts flashing 85 C PROTECT flash rate increases and CLIP starts to glow steadily The limiter will begin to reduce amplifie...

Страница 22: ...ty without prior authorization You may obtain that authorization by contacting the factory or repair facility directly Please ship amplifiers in original packing materials or equiva lent to prevent fu...

Страница 23: ...Part No TD 007500 OB PS137 2 A Harman International Company JBL Incorporated 8500 Balboa Boulevard Northridge California 91329USA...

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