Loading ...
Loading ...
Loading ...
JD250/1 • JD500/1 • JD1000/1 7
INPUT SECTION
JD monoblock amplifiers employ 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 amplifier to accept high-
voltage inputs from factory source unit outputs
without excessive distortion or noise problems.
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 stereo
or mono input signal is used, you may use a
“Y-adaptor” to split the 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 CH. 1 (L)
channel input for the automatic turn-on to operate.
INPUT VOLTAGE RANGE
A wide range of signal input voltages
can be accommodated by the amplifier’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 this amplifier. 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 (like the
JL Audio LoC-22) or voltage divider to reduce the
signal level.
Loading ...
Loading ...
Loading ...