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7
INPUT SECTION
The RD1000/1 employs a differential-balanced
input topology that provides the user with a
high degree of input flexibility, while retaining
superior noise rejection. This type of circuit
also allows the RD1000/1 to accept high-voltage
inputs from factory source unit outputs without
excessive distortion or noise problems.
INPUT SECTION
(
L
)
(
R
)
(
L
)
(
R
)
PREOUTS
You may run a stereo or a mono signal into
the inputs of the amplifier. The amplifier’s input
section automatically sums stereo signals to mono
for the internal amplifier section. The amplifier
will operate with only one input connection but
will require an increase in input sensitivity to
overcome the loss of signal. If a single mono input
signal is used, you may use a “Y-adaptor” to split
the mono signal into both inputs of the amplifier.
If you are feeding only one input and using either
the DC-Offset or Signal Sensing “Turn-On
Mode, you must use the left-channel input for
the automatic turn-on to operate.
INPUT VOLTAGE RANGE
A wide range of signal input voltages
can be accommodated by the RD1000/1’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
The “Low” position on the “Input Voltage
switch selects an input sensitivity range
between 200mV and 2V. This means that the
Input Sensitivity” rotary control 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 for all input channels. 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 RD1000/1. 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.
INPUT SENSITIVITY CONTROLS
The control labeled “Input Sensitivity” and
Clipping” LED are used to match the source
units output voltage to the input stage of the
RD1000/1 for maximum clean output. Rotating
the control clockwise will result in higher
sensitivity (louder for a given input voltage).
Rotating the control counter-clockwise will
result in lower sensitivity (quieter for a given
input voltage).
+12 VDC Ground Remote
Turn On Mode
Rem.
|
Oset
|
Signal
Low
|
High
Clipping
Input Voltage
0
+12
+5
+10
+8
Bass Boost (dB) LP Filter Freq. (Hz)
Input Sensitivity
Monoblock Subwoofer Amplifier
MONO SUBWOOFER OUPUT
(
L
)
(
R
)
CH. 1
(
L
)
CH. 2
(
R
)
INPUT SECTION
PRE-OUTS
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
12) in this manual. After using this procedure,
you can then adjust the “Input Sensitivity
levels downward if this is required to achieve the
desired system balance.
Do not increase any Input Sensitivity”
setting for any channel(s) of any amplifier in the
system beyond the maximum level established
during the procedure outlined in Appendix
A (page 12). Doing so will result in audible
distortion and possible speaker damage.
7


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