Preamp Outputs; Remote Level Control (Optional) - JL Audio HD600/4 Owner's Manual

PREAMP OUTPUTS
The HD600/4 incorporates a pass-through
preamp output section, so that additional
amplifiers can easily be connected to the same
signal(s) feeding the HD600/4. These preamp
output signals are accessible via a stereo pair
of RCA-type ja'Cks, labeled "Preouts", on the
Connection Panel.
@,I
Preouts RemOl
fA\
level
~
R Cont"
The term "pass-through" refers to the fact that
the Preamp Output signals are not affected by any
crossover filter or input sensitivity setting selected
on the HD600/4 (if the input signal is full-range,
the Preamp Output will be full-range). These
preamp output signals are buffered to prevent
noise and are always preamp level, regardless of
the level of signals feeding the HD600/4's inputs.
The pass-through Preamp Outputs can be
configured two different ways using the switch
labeled "Preouts From" in the "General Setup"
section of the Control Panel.
I [
3) "F+R" (Front + Rear): This mode delivers a
sum of the signals being fed to the "Front
Inputs" and the "Rear Inputs" of the
amplifier. When the HD600/4 is being used
to drive front and rear speaker systems, this
preamp output mode will deliver a summed
front/rear signal to the subwoofer amplifier,
while permitting fading of the front and rear
speaker systems from the source unit.
REMOTE LEVEL CONTROL (OPTIONAL)
With the addition of the optional Remote Level
Control (HD-RLC), you can control the volume
of one or both channel pairs of the HD600/4
from the front of the vehicle. This is useful for
subwoofer level control or even as a master
volume control for the system.
The HD-RLC connects to the jack labeled
"Remote Level Control" on the Connection
Panel of the amplifier using a standard telephone
cable (supplied with the HD-RLC).
If desired, multiple HD amplifiers can be
controlled from a single HD-RLC controller
using a simple phone line "splitter" and multiple
phone cables.
~,~"".~
Remote
~
Level
1
~
R Control
~
2 ch.14 Ch.
Input
Mode
All ch.1
Rear
Ch.
Remote
level Control
Front 1 F+R
Preouts
From
L - GENERAL SETUP - . l
10 HC600/4 Four-Channel Ar
1) "Front": The preamp output delivers the same
signal that is connected to the HD600/4's
"Front Inputs". This mode is useful for
feeding a subwoofer amplifier when the
HD600/4 is being used to drive front and rear
speaker systems. In this mode, the preamp
output level will track with the signal level
of the front input signals, allowing the user
to fade the rear channels in and out, without
affecting the subwoofer level.
When connected to the amplifier, the HD-RLC
operates as follows. At full counter-clockwise
rotation, the audio will mute completely. At full
clockwise rotation the level will be the same as if
the HD-RLC was not connected at all. In other
words, it operates strictly as a level attenuator.
Depending on the application, you may want
the HD-RLC to only affect one channel pair or
both channel pairs. A switch labeled "Remote
Level Control" in the "General Setup" Section
of the Control Panel allows you to determine
whether the HD-RLC affects the level of all
channels "All Ch." or only the rear channels
"Rear Ch."
13