JD
400/4
13
MULTI-AMPLIFIER SYSTEMS
Using the “Preamp Outputs” of the
JD400/4, it is easy to configure many
different multi-amplifier systems.
The most common type involves the addition
of a subwoofer amplifier, such as the JD500/1.
Common configurations of such a system are
described as follows.
Bi-Amplified System with one JD400/4 in
four-channel mode and a separate
subwoofer amplifier
This configuration requires that the separate
subwoofer amplifier has a built-in low-pass filter.
(All JL Audio amplifiers have this feature.)
In this configuration, channels 1&2 of the
JD400/4 will drive front component speakers in
stereo with high-pass filtering. Channels 3&4
will drive rear component speakers in stereo, also
with high-pass filtering. The separate amplifier
will drive the subwoofer system with low-pass
filtering (80 Hz is a good starting point).
Here are three possible configuration options:
A) Fade Subwoofer Level vs. HF Level:
Req uired: a source unit or processor with front
and rear pairs of stereo outputs.
Inp ut Connections: one stereo pair of source unit
outputs is connected to the “CH 1 (Left)” and
“CH 2 (Right)” inputs of the JD400/4 (select “2
Ch.” on the “Input Mode” switch). The second
stereo pair of source unit outputs is connected
to the subwoofer amplifier inputs.
Res ult: with this option, the user has the ability to
fade the level of the subwoofer amplifier’s input
relative to the HF channels, but cannot control
front-to-rear fading of the HF channels. The
relative level of the front and rear HF channels
will be fixed by the JD400/4’s
“Input Sensitivity” settings and will not be
user adjustable from the front of the vehicle.
B) Subwoofer Level Control Only:
Req uired: a source unit or processor with left,
right and dedicated subwoofer outputs.
Inp ut Connections: The main stereo pair
of source unit outputs is connected to the
“CH 1 (Left)” and “CH 2 (Right)” inputs of
the JD400/4 (select “2 Ch.” on the “Input
Mode” switch). The source unit’s dedicated
subwoofer output is connected to the
subwoofer amplifier inputs.
Res ult: with this option, the user has the ability
to control the absolute level of the subwoofer
channel relative to the HF channels, but
cannot fade the front and rear HF channels
relative to each other.
Set the subwoofer amplifier’s “Input
Sensitivity” with the source unit’s subwoofer
level control set at 3/4 of full output.
C) Front to Rear HF Fading and Subwoofer
Level Control:
Req uired: a source unit or processor with front
and rear pairs of stereo outputs plus a dedicated
subwoofer output.
Inp ut Connections: one stereo pair of source unit
outputs is connected to the “CH 1 (Left)” and
“CH 2 (Right)” inputs of the JD400/4.
The second stereo pair of source unit outputs
is connected to the “CH 3 (Left)” and “CH 4
(Right)” inputs of the JD400/4 (select
“4 Ch.” on the “Input Mode” switch). The
source unit’s dedicated subwoofer output is
connected to the subwoofer amplifier inputs.
SERVICING YOUR AMPLIFIER
If your amplifier fails or malfunctions, please
return it to your authorized JL Audio dealer so
that it may be sent in to JL Audio for service.
There are no user serviceable parts or fuses inside
the amplifier. The unique nature of the circuitry
in the JL Audio amplifiers requires specifically
trained service personnel. Do not attempt
to service the amplifier yourself or through
unauthorized repair facilities. This will not only
void the warranty, but may result in the creation
of more problems within the amplifier.
Содержание JD 400/4
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