“LP FILTER” (CroSSOVER) Control
The J2-1000.1 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 J2-1000.1 is fully variable between 40 Hz and 300 Hz via the “LP Filter Frequency” control knob. The 12 o’clock position corresponds to a 150 Hz filter frequency. The “10 o’clock” position corresponds to 80 Hz and is a good starting point for system tuning.
Controls
40 300
LP Filter Frequency (Hz)
“PRE-OUTS” (PREAMP OUTPUTS)
The J2-1000.1 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 “Pre-Outs”.
Pre-Outs
LEFT
RIGHT
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.
“BASS BOost” Control
The J2-1000.1 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.
Off +12dB
)Bass Boost
REMOTE LEVEL Control
The J2-1000.1 includes a remote level control that can be mounted in the front of the vehicle. This control allows the owner to adjust the overall subwoofer level to taste. To connect the remote bass control knob, insert its plug into the jack labeled “Remote Level Port” on the amplifier and route the cable and control to the desired location in the front of the vehicle.
Remote Level Port
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).
SPEAKER OUTPUT
Speaker connection to the J2-1000.1 is straightforward and takes place at the far right of the power/speaker connection panel. A single positive (“+”) connection and a single negative (“–”) connection are available via a connector labeled “Speaker Output (Mono)”.
Speaker Output (Mono)
!
IMPORTANT
Speaker loads below 1Ω nominal are not recommended and will cause the amplifier to enter into a protection mode.
Do not chassis ground any speakers connected to this or any other JL Audio amplifier. Doing so will cause the amplifier to go into protection.
To connect the speaker wires to the amplifier, strip 1/2-inch (12 mm) of insulation from each speaker wire and insert them into their appropriate connector (observing correct polarity). Then, tighten each connector using a Phillips screwdriver.
!
IMPORTANT
Do NOT attempt to “bridge” two J2-1000.1’s together or combine their output to a single load in any manner. Doing so will damage the amplifier(s).
!
IMPORTANT
Before reconnecting the battery ground and turning the system on, verify that all control settings on the amplifier are set according to the needs of the system.
