JBL MPC-X100 100 Hz - Manual

1
MPC-X100 100 Hz Subwoofer Crossover
For JBL MPC and MPA amplifiers
Owner’s Manual and Installation Guide
I. Description
The MPC-X100 is a dual-channel 100 Hz crossover filter accessory for use with JBL MPC
and MPA power amplifiers.
The MPC-X100 is user configurable to fulfill these functions:
• active crossover—Channel 1: 100 Hz low-pass; Channel 2: 100 Hz high-pass or full-range.
• subsonic filter—programmable; preset @ 20 Hz to protect against damage from infrasonic signals.
• ultrasonic filter—programmable; preset @ 20 kHz to protect against damage from ultrasonic signals.
• CD horn EQ—for use in systems with uncompensated constant-directivity horns.
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-X100, the MPC-XU is a universal crossover with selectable
crossover frequency.
The MPC-X100 installs onto the amplifier’s input card, where its settings are not easily
accessible to the user. This makes the MPC-X100 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-X100 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 both channels of the MPC-X100:
100 Hz
Linkwitz-Riley
Low-Pass Filter
Programmable
Linkwitz-Riley
Low-Pass Filter
(factory preset @ 20 kHz)
Programmable
Linkwitz-Riley
High-Pass Filter
(factory preset @ 20 Hz)
100 Hz
Linkwitz-Riley
High-Pass Filter
Channel 1
(subwoofer)
Channel 2
(high-pass or full-range)
Subwoofer
Output
High-pass or
Full-range
Output
jumper block: 3-pin
header J101
jumper block: 3-pin
header J101
jumper block: 3-pin
header J201
jumper block: 3-pin
header J102
jumper block: 3-pin
header J202
jumper block: 3-pin
header J203
resistor network RN202
& switch S201
resistor network RN104
Figure 1. Block diagram of the MPC-X100
*TD-000084-00*
TD-000084-00
Rev. A