System Configurations - JL Audio RD400/4 Owner's Manual

If the condition remains, it will return to red
and mute the output again. A continuous
over-current condition is displayed with
alternating red/blue lights. Because the muting
behavior may be very short in duration, it
may manifest itself as an audible, repetitive
ticking or thumping noise in the output.
Over-current conditions can be caused by a
speaker impedance lower than the optimum
load impedance range for the amplifier or a
short-circuit in the speaker wiring. The latter
can result from a short circuit between the
positive and negative speaker wires or between
either speaker wire and the vehicle chassis.
4) LEDs off / Amplifier Shuts Off Unexpectedly
The only condition that will shut down an
undamaged RD400/4 completely is if battery
voltage or remote turn-on voltage drops below
10 volts. The LED light strip will turn off when
this occurs. The amplifier will turn back on
when voltage climbs back above 11 volts. If
this is happening in your system, have your
charging system and power wiring inspected.
For more information on troubleshooting this
amplifier, refer to Appendix C (pages 16, 17).

SYSTEM CONFIGURATIONS

The RD400/4 is a flexible amplifier, well-suited
for a multitude of system configurations. In this
section, the most likely configurations for a system
with a single RD400/4 are explained in detail.
Once you have selected your desired
configuration, you can use the amplifier panel
drawing on pages 18 & 19 to mark the required
switch positions for easy reference.
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 RD400/4 can be configured to drive a
bi-amplified system by itself or with a separate
subwoofer amplifier.
Bi-Amplified System with one RD400/4
In this configuration, channels 3&4 of the
RD400/4 will drive subwoofers (stereo or bridged)
with low-pass filtering. Channels 1&2 will
drive component speakers in stereo with
high-pass filtering.
Input connection options for a bi-amplified system
with one RD400/4 are as follows:
A) No User Adjustability:
Req uired: a basic source unit or processor
with one pair of stereo outputs.
Inp ut Connections: a single pair of stereo source
unit outputs connected to the "CH 1 (Left)"
and"CH 2 (Right)" inputs of the RD400/4
(select "2 Ch." on the "Input Mode" switch).
Res ult: the relative level of the LF and HF
channels will be determined by the RD400/4's
"Input Sensitivity" settings and will not be
user adjustable from the front of the vehicle.
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