JL Audio J2250.1 owner manual LP Filter CroSSOVER Control, PREAmP Outputs

“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.

“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”.

Preamp

Outputs

LEFT

max 60 240 O￿

t Sens. LP Filter Frequency (Hz) Bass

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.

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