JL Audio J2360.2 - Manual (Page 5)

8 JL Audio 9
PreamP outPuts
The J2-360.2 incorporates a pass-through
preamp output section, so that additional
amplifiers can be easily added to the system. This
pass-through pre-amp output delivers the same
signals that are fed into the amplifier's inputs.
Filter Frequency (Hz) Input Sens. Bass Boost
min max 50 500 Off +9dB
Power Protect
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
HP | Off | LP
Filter Mode
High-Level Inputs
The preamp output signal is not affected by the
“Bass Boost” processing selected for the amplifier
or by any crossover filter selected (if the input
signal is full-range, the preamp output will be
full-range).
Note: The signal level of the “Preamp Output” is
always line-level (low voltage).
sPeaker outPuts
The J2-360.2’s speaker outputs are designed to
accept 16 AWG - 8 AWG wire.
Made in China
LEFT CHANNEL RIGHT CHANNEL
Bridged
FUSES Ground
20A 20A
Remote + 12VDC
J2-360.2 is designed to deliver power into
speaker loads equal to or greater than 2 ohms per
channel when using a “stereo” configuration and
speaker loads equal to or greater than 4 ohms
when using a “bridged” configuration.
IMPORTANT !
Speaker loads below 2 ohms nominal per
channel are not recommended and may cause
the amplifier to initiate a protection mode.
bridging Considerations
Bridging is the practice of combining the
output of two amplifier channels to drive a single
load. When bridged, each channel produces
signals of equal magnitude, but opposite polarity.
The combined output of the two channels
provides twice the output voltage available from
a single channel. The J2-360.2 has been designed
for bridging of its channels without the need for
input inversion adaptors.
To bridge a pair of channels, use the
“Left +” and “Right –” speaker connectors only
(the “Left –” and “Right +” remain unused).
When bridged, the amplifier will deliver
optimum power into a 4 ohm load.
Filter Controls
The active filter built into the J2-360.2 can
be used to eliminate potentially harmful and/
or undesired frequencies from making their way
through the amplifier section to the speaker(s).
This serves to improve tonal balance and to avoid
distortion and possible speaker failure. Correct
use of this filter can substantially increase the
longevity and fidelity of your audio system.
Filter Frequency (Hz) Input Sens. Bass Boost
min max 50 500 Off +9dB
Power Protect
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
HP | Off | LP
Filter Mode
High-Level Inputs
1) “Filter Mode” Control: The J2-360.2 employs
a 12dB per octave filter. This filter can be
configured into one of two filter types or
defeated completely by way of the three-
position “Filter Mode” switch:
“HP” (High-Pass): Configures the filter to
attenuate frequencies below the selected filter
frequency at a rate of 12dB per octave. This is
useful for connection of component speakers
the J2-360.2’s in a bi-amplified system.
Off”: Defeats the filter completely, allowing the
full range of frequencies present at the inputs
to feed the amplifier. This is useful for systems
utilizing outboard crossovers or requiring full-
range reproduction from the J2-360.2.
“LP” (Low-Pass): Configures the filter to
attenuate frequencies above the selected filter
frequency at a rate of 12dB per octave. This is
useful for connection of subwoofer(s) to the
J2-360.2’s in a bi-amplified system.
2) “Filter Freq. (Hz)” The J2-360.2 has separate
Filter Frequency controls in each Channel
Controls section for the low-pass filter and
the high-pass filter. You will only use one of
these in each channel section, depending on
which “Filter Mode” you have selected (or
none of them if you have selected the “Off”
position for the “Filter Mode”).
When active, the filter in the J2-360.2 is fully
variable between 50 Hz and 500 Hz via the
control knob labeled “Filter Frequency (Hz)”.
The “9 o’clock” position corresponds to 80 Hz
and is a good starting point for system tuning.
“bass boost” Controls
Each channel pair of the J2-360.2 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 +9dB (full-clockwise) and is
centered at 45 Hz.
Filter Frequency (Hz) Input Sens. Bass Boost
min max 50 500 Off +9dB
Power Protect
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
HP | Off | LP
Filter Mode
High-Level Inputs