JL Audio J2250.1 - Manual (Page 8)

8 JL Audio
“lP Filter” (crossoVer) control
The J2-250.1 employs a 12dB/octave low-pass
(LP) 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 midrange content.
The low-pass filter in the J2-250.1 is fully
variable between 60 Hz and 240 Hz via the “LP
Filter Frequency” control knob. The “10 o’clock”
position corresponds to 80 Hz and is a good
starting point for system tuning.
LP Filter Frequency (Hz) Input Sens. Bass Boost
Power Protect
Remote
Level Port
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
min max 60 240 Off +9dB
High-Level Inputs
“PreamP outPuts”
The J2-250.1 incorporates a preamp output
section, designed to make multiple amplifier
systems easy to set up. This section consists
of a pair of RCA-type jacks marked
“Preamp Outputs”.
LP Filter Frequency (Hz) Input Sens. Bass Boost
Power Protect
Remote
Level Port
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
min max 60 240 Off +9dB
High-Level Inputs
The Preamp outputs deliver the same signal that
is being fed to the inputs. (If the input signal are
full-range, the preamp outputs will be full-range).
This signal is not affected by the bass boost or LP
FIlter processing selected for the amplifier.
IMPORTANT !
The signal level of the preamp output is always
low-level regardless of whether you are using
the “High-Level Inputs” or the Low-Level
(RCA-jack) Inputs.