JL Audio CR-1, Owner'S Manual

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CR-1

Subwoofer Output Mode Switch

The “Subwoofer Output Mode” switch determines whether the low-pass 

signal at the subwoofer outputs is in stereo (independent left and right signals), or 

if both subwoofer outputs deliver a left + right (mono-summed) signal. 

If you are using a single subwoofer, set the Mode Switch to “L+R” to sum both 

left and right low-pass signals to mono for the single subwoofer. 

If you have a pair of subwoofers, you can decide whether to make them 

independent, left and right (“Stereo” Mode), or make them both output the same 

mono-summed signal (“L+R” Mode). Experiment with both settings to determine 

which works best in your room for 2-channel and multi-channel playback.

Crossover Slope Switch 

The “Crossover Slope” switch changes the attenuation slope of the high-pass 

and low-pass filters. CR-1 offers a choice between a moderate 12 dB/octave (2nd 

order) and a steep 24 dB/octave (4th order) slope. A 24 dB per octave high-pass 

filter attenuates signals below its corner frequency at a rate of -24 dB for every 

halving of frequency. A 24 dB per octave low-pass filter attenuates signals above 

its corner frequency at a rate of -24 dB for every doubling of frequency. The 2nd 

order filter setting attenuates at only -12 dB per octave above or below each filter’s 

corner frequency. With a steeper roll off slope, there is less “overlap” of acoustical 

output between the satellite speakers and the subwoofer. 

We recommend using the 24 dB/octave slope as a default, as it permits less 

interaction between the main loudspeakers and subwoofers in the crossover 

region. The steeper 24 dB/octave filter also does a better job of protecting the 

main speakers from the effects of low-frequencies that are better handled by the 

subwoofer(s). There are some uncommon situations where a 12 dB/octave filter 

may perform better, which is why the CR-1 includes the shallower slope option.

10

Frequency (Hz)

100

1K

Voltage (dB)

-50

-40

-30

-20

-10

0

10

Subwoofer / Satellite Filter = 12dB

Subwoofer / Satellite Filter = 24db

100 Hz Crossover Frequency

Satellite

Subwoofer

Effects of “Crossover Slope” Switch (low-pass and high-pass filters are shown)