"Bass Boost" Control; Remote Level Control - JL Audio JX250/1 Owner's Manual

LOW-PASS FILTER CONTROL
The JX monoblock employs a 12dB/octave
low-pass active filter for its internal channel. This
feature is designed to attenuate frequencies above
its filter frequency, so that the system's subwoofers
do not reproduce any audible mid-range content.
The low-pass filter is fully variable between
50 Hz and 200 Hz via the "Filter Frequency"
control knob. 80 Hz (as shown in the diagram
below) is a good starting point for system tuning.
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"PREOUTS"
The JX monoblock incorporates a pass-
designed to make multiple amplifier systems easy
to set up. This section consists of a pair of RCA-
type jacks marked "Preouts".
These preamp outputs deliver the same signal
that is being fed to the Low-Level inputs. (If the
input signals are full-range, the preamp outputs
will be full-range). This signal is not affected by
the bass boost or Filter processing selected for the
amplifier.
I M P O R TA N T !
The "Preouts" of the JX250/1 and JX500/1D
will not pass signals from the Hi-Level inputs.
The JX1000/1D will pass signals from the
Hi-Level inputs and will attenuate them to
Low-Level.
JL Audio

"BASS BOOST" CONTROL

The JX monoblock includes a single band,
boost-only bass equalizer controlled by a rotary
knob marked "Bass Boost". This control has a
boost range of 0dB (full-counterclockwise) to
+12dB (full-clockwise) and is centered at 45 Hz.
JX JX JX1000/1D

REMOTE LEVEL CONTROL

With the optional RBC-1 Remote Level
Control (sold separately), you can control the
subwoofer volume from the front of the vehicle.
The RBC-1 connects to the jack
labeled "Remote Level Control" on the
amplifier, using a standard telephone
cable (supplied with the RBC-1).
When connected to the amplifier, the
Remote Level Control 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 RBC-1 was not connected at all. In
other words, it operates strictly as a level
attenuator. This control will not affect the
"Bass Boost" feature of the JX Monoblock.
Care should be taken to securely mount this
control in a manner that does not interfere with
vehicle operation.
When setting the amplifier's input sensitivity,
the Remote Level Control should be unplugged or
at full clockwise rotation (maximum level).
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