Jbl-professional MPC-XU User Manual download pdf

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

Figure 1. One channel of the MPC-XU

*TD-000082-00*

TD-000082-00

Rev. B

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - MPC-XU Universal Crossover

1MPC-XU Universal CrossoverFor JBL MPC and MPA amplifiersOwner’s Manual and Installation GuideI. DescriptionThe MPC-XU is a dual-channel universal cro

Page 2 - Solder holes for MPC-XU

2II. InstallationCAUTION: The MPC-XU contains active components which can be damaged by electro-static discharge (ESD). Be sure to practice standard E

Page 3 - III. Programming the MPC-XU

3Figure 5. The MPC-XU’s switches, jumpers, and resistor networks.III. Programming the MPC-XUThe MPC-XU board has four switches, six 3-pin headers, and

Page 4 - Bypassing the filters

4Programming the low-pass filterBypass/enable headerTo use the low-pass filter, set the jumper onJx01 across pins 2 and 3, which are the lower two pi

Page 5 - IV. Typical configurations

5IV. Typical configurationsSubsonic Filter (Infrasonic Filter)Applications: Subsonic filters are commonly used in sound installations to filter out ru

Page 6

6Ultrasonic FilterApplications: An ultrasonic filter is useful for minimizing RF interference, oscillations,leakage or aliasing from digital devices,

Page 7 - 2-Way Active Crossover

7MPC-XU2-Way Active CrossoverThis configuration routes the frequencies below a particular frequency to amplifier Channel 1,which will driver the low-f

Page 8 - Appendix

8AppendixIdentifying resistor networksUse this chart to identify the values of the resistor networks. See the tables on page 4 to findthe correct val

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Jbl-professional MPC-XU User Manual

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Summary of Contents

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