JL Audio MHD600/4-24V Owner's Manual page 12

bi-amPliFied sYstems
Bi-amplified systems are defined as systems
in which separate amplifier channels drive low-
frequency (LF) and high-frequency (HF) speakers
and are separately filtered to send appropriate
frequency ranges to each speaker system.
The most common application of
bi-amplification in mobile audio is to drive a
subwoofer system from one or more amplifiers or
channels and component speakers from separate
amplifiers or channels.
The MHD600/4-24V can be configured to
drive a bi-amplified system by itself or with a
separate subwoofer amplifier.
bi-amplified system with one mHd600/4-24V
In this configuration, the "Rear" channels
of the MHD600/4-24V will drive subwoofers
(stereo 150W x 2 or bridged 300W x 1) with
low-pass filtering. The "Front" channels
will drive component speakers in stereo
(150W x 2) with high-pass filtering.
Crossover Setup for Bi-Amplified System
with one MHD600/4-24V:
Once the input sections have been configured
appropriately, go to the "Rear Channel Controls"
Section. Select "LP" (low-pass) on the "Filter
Mode" switch and "12dB" or "24dB" on the
"Filter Slope" switch and an appropriate "Filter
Freq." (80-90 Hz is a good starting point).
Next, turn your attention to the "Front
Channel Controls" Section. and select "HP"
(high-pass) on the "Filter Mode" switch and
"12dB" or "24dB" on the "Filter Slope"
switch and an appropriate "Filter Freq."
(again, 80-90 Hz is a good starting point).
After proper adjustment of the Front and
Rear channel "Input Range" and "Input
Sens." controls using the method shown
in Appendix C (pages 18, 19), you can
fine tune filter frequencies and slopes and
attenuate either pair of channels to achieve
proper balance. For precise filter frequency
information refer to Appendix B (page 18).
12 | JL Audio - MHD600/4-24V Owner's Manual
bi-amplified system with one
mHd600/4-24V in four-channel mode
and a separate subwoofer amplifier
This configuration requires that the separate
subwoofer amplifier has a built-in low-pass
filter. In this configuration, the "Front"
channels of the MHD600/4-24V will drive
front component speakers (stereo 150W x 2)
with high-pass filtering. The "Rear" channels
will drive rear component speakers in stereo
(150W x 2) with high-pass filtering.
The separate subwoofer amplifier will drive
the subwoofer system with low-pass filtering
(select a filter frequency of 80-90 Hz to start). The
inputs of the subwoofer amplifier can be fed from
the MHD600/4-24V's preamp output or from a
dedicated subwoofer output on the source unit.
Crossover Setup for Bi-Amplified System with
one MHD600/4-24V and a separate subwoofer
amplifier:
Once the input and preamp output sections
have been configured appropriately, go to the
"Front Channel Controls" Section. Select "HP"
(high-pass) on the "Filter Mode" switch and
"12dB" or "24dB" on the "Filter Slope" switch
and an appropriate "Filter Freq." (80-90 Hz is a
good starting point).
Next, turn your attention to the "Rear
Channel Controls" Section and select "HP"
(high-pass) on the "Filter Mode" switch and
"12dB" or "24dB" on the "Filter Slope" switch
and an appropriate "Filter Freq." (again, 80-90 Hz
is a good starting point).
After proper adjustment of the MHD600/4-
24V's and the subwoofer amplifier's "Input
Range" and "Input Sens.", you can fine tune
filter frequencies and slopes and attenuate either
pair of channels to achieve proper balance. For
proper adjustment of the "Input Sens." controls
of the MHD600/4-24V use the method shown
in Appendix C (pages 18, 19). For precise filter
frequency information for the MHD600/4-24V
refer to Appendix B (pages 18). Refer to the
subwoofer amplifier owner's manual for its proper
adjustment levels.