JL Audio MHD600/4-24V Owner's Manual page 9

amPliFier inPuts
The MHD600/4-24V has two separate input
sections, one for the "Front" left and right
channels and another for the "Rear" left and right
channels. Each section consists of a pair of RCA-
type input jacks on the Connection Panel of the
amplifier and a pair of input controls on the
Control Panel of the amplifier: an "Input Voltage"
switch and an "Input Sens." rotary control.
"inPut mode" switcH
The Control Panel houses an "Input
Mode" switch located under the "General Setup"
heading. This switch allows operation of all four
amplifier channels with only one pair of input
signals or with independent front and rear input
signal pairs.
To use separate inputs for the "Front" and
"Rear" amplifier sections, (in order to permit
front-to-rear fading, for example), select "4 Ch."
on the "Input Mode" switch. In this mode, you
must connect separate pairs of input cables to the
"Front" and "Rear" amplifier inputs.
To operate all four channels of the MHD600/4-
24V with a single pair of stereo inputs, select the
"2 Ch." position on the "Input Mode" switch and
connect a single pair of input cables to the "Front"
input jacks only. In this mode, the amplifier will
route the signals connected to the "Front" inputs
to the Front and Rear amplifier channels.
cHannel control sections
Flanking the "General Setup" section
on the Control Panel of the amplifer are
two sets of identical controls: one for the
"Rear Channel Controls" (on the left side)
and one for the "Front Channel Controls"
of the amplifier (on the right side).
In each of these sections you will find an
"Input Voltage" range switch and a rotary
control labeled "Input Sens." (Input Sensitivity).
These controls are designed to match the input
sensitivity of the MHD600/4-24V to the specific
signal source that is feeding it and must be
adjusted, with care, following the procedures
outlined in this manual. Failure to make correct
adjustments can result in weak output, excessive
distortion and/or undesirable noise in the audio
output of the amplifier!
Note: The Channel Control sections also house
"Filter Mode", "Filter Slope" and "Filter Freq."
controls. These are crossover filter controls
and will be discussed in the next section of this
manual. This section will explain the Input
Controls only.
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