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JL Audio RD900 Manual

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7
INPUT SECTION
The RD900/5’s input section allows you to send
signals to the amplifier section through the use
of two, four or six differential-balanced inputs.
Input connections are via three pairs
of traditional RCA-type jacks.
INPUT SECTION
Left
or
Mono
Right
Only
CH. 1&2 CH. 3&4 SUB CH.
CH. 3
(
L
)
CH. 4
(
R
)
CH. 1
(
L
)
CH. 2
(
R
)
BridgedBridged
Speaker Outputs Mono Subwoofer OutputSpeaker Outputs
+12 VDC Ground Remote
Remote
Level
Control
(RBC-1)
Left
or
Mono
Right
Only
+12 VDC Ground Remote
Input Mode
2 Ch.
|
4 Ch.
|
6 Ch.
Input Voltage
Low
|
High
Rem.
|
Oset
|
Signal
CH. 1
CH. 2
CH. 3
CH. 4
SUB
SUB
INPUT SECTION
Turn On Mode
CH. 3
(
L
)
CH. 4
(
R
)
CH. 1
(
L
)
CHANNELS 1 & 2
CH. 2
(
R
)
HP Filter Freq. (Hz) HP Filter Freq. (Hz)
Input Type
Input Sensitivity Input Sensitivity
Stereo
|
Mono
Input Type
Stereo
|
Mono
5 Channel System Amplifier
CHANNELS 3 & 4
Clipping
LP Filter Freq. (Hz)
Input Sensitivity
Clipping
Clipping
SUBWOOFER CHANNEL
If you wish to send six discrete channels into
the RD900/5, simply use all six inputs and set
the “Input Mode” switch in the “6 Ch.” position.
You may run a stereo or mono signal into the
“SUB CH.” inputs of the amplifier. The
amplifier’s subwoofer channel input section
automatically sums stereo to mono for the
internal amplifier section. If you have only one
channel of subwoofer signal available, it is
acceptable to only use one of the “SUB CH.”
inputs, but for optimal gain, we recommend using
a Y-adaptor and feeding both “SUB CH.” inputs.
If you prefer to use only four channels of input
into the RD900/5, set the “Input Mode” switch
in the “4 Ch.” position and use the Ch 1 & 2 and
Ch 3 & 4 Inputs. In this mode, the RD900/5 will
derive its subwoofer channel signal from a sum
of all four input signals. The bass will not fade
when the signal is faded by the head unit from
front to rear.
You may also choose to apply only two
channels of input to deliver signal to all five
amplifier channels. To do this, set the “Input
Mode” switch to “2 Ch.” and use only the inputs
to channels 1 & 2. In this mode, Channel 3
will operate with the Channel 1 signal and
Channel 4 will operate with the Channel 2
signal. The amplifier will automatically
combine the main input signals to mono for
the Subwoofer Channel.
INPUT VOLTAGE RANGE
A wide range of signal input voltages can be
accommodated by the RD900/5’s input section
(200mV – 8V). This wide range is split up
into two sub-ranges, accessible via the “Input
Voltage” switch:
“Low”: for preamp level signals
“High”: for speaker level signals
This switch affects all channels of the amplifier
equally. The “Low” position on the “Input
Voltage” switch selects an input sensitivity range
between 200mV and 2V. This means that the
“Input Sensitivity” rotary controls will operate
within that voltage window. If you are using
an aftermarket source unit, with conventional
preamp level outputs, this is the position you
should select.
The “High” position on the “Input Voltage”
switch selects an input sensitivity range between
800mV and 8V. This is useful for certain high-
output preamp level signals as well as speaker
level output from source units and small
amplifiers. To use speaker level sources, splice the
speaker output wires of the source unit or small
amplifier onto a pair of RCA cables or plugs,
or use the JL Audio ECS Speaker Wire to RCA
adaptor (XD-CLRAIC2-SW).
Line output converters are usually not needed
with the RD900/5. If you find that the output
cannot be reduced sufficiently with a direct
speaker level signal applied to the amplifier and
the “Input Voltage” switch in its “High” position,
you may use a line output converter or voltage
divider to reduce the signal level.
… 7 …


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