JBL Professional MPC-XU User Manual

1

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 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 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

*TD-000082-00*

TD-000082-00

Rev. B