JBL Professional MPC-XU - Manual (Page 7)

7
MPC-XU
2-Way Active Crossover
This configuration routes the frequencies below a particular frequency to amplifier Channel 1,
which will driver the low-frequency speaker(s), and the frequencies above to Channel 2, which
will drive the high-frequency speaker(s). Using the MPC-XU as a crossover requires that you
drive both amplifier inputs with the same full-band signal.
Program settings:
1 On the input module, set the amplifer mode to parallel. Alternately, you could use a Y-
cable to provide the same signal to both channel inputs.
Channel 1:
2 Set J101 to enable the Channel 1’s low-pass filter by placing jumper across pins 2 and 3.
3 No jumper on J103.
4 Insert a resistor network into RN102 that is appropriate to the desired crossover frequency.
5 Subsonic (infrasonic) filter—If you need subsonic (infrasonic) filtering, set J102 to enable
the high-pass filter by placing jumper across pins 2 and 3, and insert a resistor network into
RN104 corresponding to the roll-off frequency you desire. If you do not want subsonic
(infrasonic) 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 boost you need. If you do not want CD horn equalization, do not
place any jumper on J203.
9 Ultrasonic filtering—If you need ultrasonic filtering, set a jumper on J201 across pins 2 and 3
to enable Channel 2’s Low-pass filter and insert a resistor network into RN202 that
corresponds to the desired roll-off frequency. If you do not want any ultrasonic filtering,
set the jumper on J201 across pins 1 and 2 to bypass the low-pass filter.
Multi-way Crossover System
The MPC-XU allows you to set up 3- and even 4-way systems. Of course, this also requires that
you use more than one amplifier and more than one MPC-XU. You must feed each amplifier
with the same full-range signal and use the MPC-XU to filter the signals in the individual channels.
Each MPC-XU should be configured in the bandpass filter configuration as described above.