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JL Audio MHD900 Manual

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9
AMPLIFIER INPUTS
The MDH900/5-24V has three separate
input sections, one for the “Front” left and
right channels, another for the “Rear” left
and right channels and one for the Subwoofer
Channel. Each section consists of a pair of
RCA-type input jacks on the Connection
Panel of the amplifier and input controls on
the Control Panel of the amplifier: a single
“Input Voltage” switch, an “Input Mode”
switch and three individual “Input Sens.”
rotary controls (one in each channel section).
“INPUT MODE” SWITCH
The “Input Mode” switch is located under
the “General Setup” heading at the far right of
the control panel. This switch allows operation
of all five amplifier channels with only one pair
of input signals (2 ch.) or with independent front
and rear input signal pairs (4 ch.) or with discrete
front, rear and subwoofer signal pairs (6 ch.).
“6 Ch.” Input Mode
In this mode, you will connect separate pairs
of input cables to the “Front”, “Rear” and “Sub”
amplifier inputs, allowing you full channel
control from the source unit. If the source unit
only provides a mono (single) subwoofer output,
use a y-adaptor cable to feed both the “Left” and
“Right” subwoofer inputs of the MDH900/5-24V
with the mono signal. Failure to do so will result
in reduced gain and possible distortion.
“4 Ch.” Input Mode
In this mode, you will connect separate
pairs of input cables to the “Front” and “Rear”
amplifier inputs and leave the “Sub” inputs
unused. The subwoofer channels will receive
signal from the sum of the signals at the “Front”
and “Rear” inputs so that front-to-rear fading of
the main channels does not significantly affect
the subwoofer level.
“2 Ch.” Input Mode
To operate all five channels of the MDH900/5-
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. The “Rear” and “Sub”
input jacks will remain unused. In this mode, the
amplifier will route the signals connected to the
“Front” inputs to the Front, Rear and Subwoofer
channels. Front-to-rear fading will not be available.
“Input Voltage” Switch
A wide range of signal input voltages can
be accommodated by each of the MDH900/5-
24V’s differential-balanced inputs (200mV
– 8V RMS). This wide range is split up into two
sub-ranges, accessible via the “Input Voltage”
switch located next to the “Input Mode”
switch under the “General Setup” heading.
The “Low” position of the “Input Voltage”
switch selects an input sensitivity range between
200mV and 2V for all the amplifier channels. This
means that the “Input Sens.” rotary controls will
operate within that voltage window. If you are
using an aftermarket source unit, with preamp-
level outputs, this is most likely the position that
you will use (regardless of what voltage output
capability is claimed by the source unit).
The “High” position of the “Input Voltage”
switch selects an input sensitivity range between
800mV and 8V. This is for use with speaker-level
outputs from source units and small amplifiers
found in many OEM (factory-installed) systems.
To use speaker-level sources, splice the speaker
output wires of the source unit or small amplifier
onto a pair of RCA plugs for each input pair or use
the JL Audio ECS Speaker Wire to RCA adaptor
(XB-CLRAIC2-SW). It is not necessary (or advisable)
to use “Line Output Converters” with
your MDH900/5-24V.
… 9 …


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