JL Audio J2250.1 Owner's Manual page 8

"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.
min max
Input Sens. LP Filter Frequency (Hz)
8
60 240 O +9dB
Bass Boost
"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".
High-Level Inputs
Power
Protect
Remote
Level Port
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.
Preamp Amplifier
Outputs Inputs
LEFT LEFT
RIGHT RIGHT
JL Audio
min max
Input Sens.