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MPC-XU Universal Crossover

For JBL MPC and MPA amplifiers

Owner’s Manual and Installation Guide

I. Description

The MPC-XU is a dual-channel universal crossover filter accessory for use with JBL MPC

and MPA power amplifiers.
The MPC-XU is user configurable to fulfill these functions:

active crossover

bandpass filter

subsonic filter

ultrasonic filter

The MPC-XU allows independent filtering of the two audio channels. The choices are:

high-pass filtering (selection of 19 frequencies)

low-pass filtering (selection of 17 frequencies)

bandpass filtering (selection of any combination of the high-pass or low-pass frequencies)

Each channel has an electronically balanced input and bypassable low-pass and high-pass

sections. Each filter circuit uses a 4-pole (24 dB/oct) Linkwitz-Riley alignment.
An alternative to the MPC-XU, the MPC-X100 is preset at 100 Hz for use only as a

subwoofer crossover.
The MPC-XU installs onto the amplifiers input card, where its settings are not easily acces-

sible to the user. This makes the MPC-XU ideal for installed or rental sound systems, since it

practically eliminates the danger of unauthorized tampering with crossover setting or

incorrect crossover output connections, as well as the loudspeaker damage that may result

from such user tampering.
Installing the MPC-XU involves soldering a 10-pin and a 12-pin header into corresponding

holes on the input card, a process that only qualified technical persons should attempt. We

recommend that you enlist an authorized JBL service center to perform the task. See the

installation section of this manual for more information.
Figure 1 shows a block diagram of one channel of the MPC-XU:

Programmable
Linkwitz-Riley
Low-Pass Filter

Programmable
Linkwitz-Riley
High-Pass Filter

Figure 1. One channel of the MPC-XU

*TD-000082-00*

TD-000082-00

Rev. B

Содержание MPC-XU

Страница 1: ...e MPC XU the MPC X100 is preset at 100 Hz for use only as a subwoofer crossover The MPC XU installs onto the amplifier s input card where its settings are not easily acces sible to the user This makes the MPC XU ideal for installed or rental sound systems since it practically eliminates the danger of unauthorized tampering with crossover setting or incorrect crossover output connections as well as...

Страница 2: ...PUT ISOL OUTPUT ISOL OUTPUT AUDIO TRANSFORMER AUDIO TRANSFORMER 70V 70V 25V 25V 100V 100V 0 70 100 0 70 100 0 0 dB dB 10 10 8 8 6 6 4 4 2 2 24 24 18 18 14 14 STEREO 12 12 CH2 INPUT CH1 CH2 CH1 PARALLEL BRIDGE LEVEL LEVEL GROUND INPUT 3 Locate and remove the screws securing both the upper blank and the lower input panels to the rear side of the chassis 2 screws on each mini panel The upper blank pa...

Страница 3: ...U accordingly Bridged Mode Operation If the amplifier is to be used in bridged mono mode bypass Channel 2 of the MPC XU and use only Channel 1 s input and processing NOISE SHIELD TAB 4 40 NUT CH 1 GAIN CONTROL NOISE SHIELD INPUT PANEL PCB 8 If you need to make any adjustments to the MPC XU settings or if you need to record them do so now because the MPC XU will be inaccessible once the noise shiel...

Страница 4: ...z H 0 2 z H 0 0 2 K 0 2 1 z H 0 3 z H 0 0 3 K 2 8 z H 0 4 z H 0 0 4 K 6 5 z H 0 5 z H 0 0 5 K 7 4 z H 0 8 z H 0 0 8 K 7 2 z H 0 0 1 z H 0 0 0 1 K 2 2 z H 0 2 1 z H 0 0 2 1 K 0 2 z H 0 5 1 z H 0 0 5 1 K 5 1 z H 0 0 2 z H 0 0 0 2 K 2 1 z H 0 0 4 z H 0 0 0 4 K 6 5 z H 0 0 5 z H 0 0 0 5 K 7 4 z H 0 0 8 z H 0 0 0 8 K 7 2 Programming the high pass filter Bypass enable header To use either the high pass ...

Страница 5: ...J X s s a p w o l e l b a n E 1 0 1 J X s s a p h g i h s s a p y B 2 0 1 J X s s a p h g i h e l b a n E 2 0 1 J X t s o o b n r o h D C e l b a s i D 3 0 1 J X z H k 0 2 B d 6 t s o o b n r o h D C 3 0 1 J X z H k 0 2 B d 0 1 t s o o b n r o h D C 3 0 1 J X 2 l e n n a h C s s a p w o l s s a p y B 1 0 2 J X s s a p w o l e l b a n E 1 0 2 J X s s a p h g i h s s a p y B 2 0 2 J X s s a p h g i ...

Страница 6: ...r resistor network corresponding to the upper limit of the desired passband in RNx02 socket CD Horn Equalization Filter Applications A constant directivity horn requires a 6 dB per octave boost at high frequen cies to provide a flat frequency response On the MPC XU you must use the CD horn equalization in conjunction with the high pass filter Program settings 1 Set Jx01 to bypass the low pass filt...

Страница 7: ...c filtering set J102 to disable the high pass filter by placing jumper across pins 1 and 2 Channel 2 6 Set J202 to enable the Channel 2 s high pass filter by placing jumper across pins 2 and 3 7 Insert a resistor network into RN204 that is appropriate to the desired crossover frequency 8 CD horn EQ If you need equalization for a constant directivity horn set a jumper on J203 for the amount of boos...

Страница 8: ...man International Company MPC XU MANUAL 3 99 V Warranty Contacting JBL These products are designed and backed by JBL Professional the world leader in sound reinforcement For complete JBL warranty information to order replacement parts or to ask for clarifications to this manual contact JBL Professional Within the United States Contact the Applications Dept JBL Professional PO Box 2200 8500 Balboa ...

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