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INFRASONIC FILTER
The “Infrasonic Filter” is a 24 dB/octave high-
pass filter, with a fixed cutoff frequency of 30 Hz.
This filter is designed to conserve amplifier power
and protect subwoofer systems, without audibly
degrading the sub-bass output.
With ported enclosures, the use of the
Infrasonic Filter” is highly recommended to
protect the speaker(s) from excessive excursion
below enclosure tuning.
With sealed enclosures, the use of the filter
is less necessary, but can still help protect the
speaker system from excessive excursion.
The “Infrasonic Filter can be completely
defeated by selecting the “Off” position on its
switch. This bypasses all signal from flowing
through the circuit.
REMOTE LEVEL CONTROL OPTIONAL
Remote
Level
Control
+12 VDC Ground Remote
Mono Subwoofer Output
With the addition of the optional Remote
Level Control (HD-RLC), you can control the
subwoofer volume from the front of the vehicle.
The HD-RLC connects to the jack labeled
Remote Level Control” on the Connection
Panel of the amplifier using a standard telephone
cable (supplied with the HD-RLC). If desired,
multiple XD (and HD) amplifiers can be
controlled from a single HD-RLC controller using
a single-line, four-wire phone line splitter and
multiple phone cables.
When connected to the amplifier, the HD-RLC
operates as follows: At full counter-clockwise
rotation, the audio will mute completely. At full
clockwise rotation the level will be the same as if
the HD-RLC was not connected at all. In other
words, it operates strictly as a level attenuator.
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