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| CR-1
Next, defeat all signal processing on your subwoofer. In other words, turn off
any on-board low-pass filtering and defeat any polarity or phase controls, and set
the subwoofer’s Level control to the middle position. We will first set the CR-1
and then tweak the subwoofer’s controls.
Using familiar music with significant mid-bass energy (frequency content
that occurs in the crossover region), listen to your system and adjust your
subwoofer’s Master Level control to match the level of the satellites. There
should be a smooth audible transition from the mid-bass (from the satellites) into
the deep bass (from the subwoofer) with no particular emphasis in either band.
Later you can fine tune levels using the CR-1’s Sub/Sat Balance control.
Next, play the same music again at an elevated level to assess the dynamic
capability of your satellites. With the inclusion of the CR-1, your satellites should
exhibit increased dynamic headroom and the midrange should sound more
effortless and natural. If your satellites sound strained or exhibit distortion at
high levels, try increasing the crossover frequency for both the satellites and the
subwoofer (adjust them to the same frequency). If your satellites are particularly
small, a 100 Hz crossover frequency may be more appropriate.
If your crossover frequency needs to go above 120 Hz, other aspects of your
system may need adjusting, such as speaker placement in the room. After adjustment,
your system should sound open and dynamic at a variety of volume levels.
Other adjustments on the CR-1 and your powered subwoofer(s) make it
possible to dial in your system’s transition from the satellites to the subwoofer in
the crossover region and to get the subwoofers dialed in for your room’s acoustics.
A good, high-resolution, real-time analyzer is very helpful to adjust these controls,
but they can also be adjusted by ear.
A) Crossover Frequency (CR-1 front panel)
B) Crossover Slope (CR-1 front panel)
C) Damping (CR-1 front panel)
D) Polarity (on your powered subwoofer)
E) Phase (on your powered subwoofer)
F) E.L.F. Trim (on your Fathom or Gotham powered subwoofer)
G) A.R.O. (Automatic Room Optimization on your Fathom or
Gotham powered subwoofer)
Possible adjustments include splitting the crossover frequencies (a lower
crossover frequency for the subwoofer and a higher crossover frequency for
the satellites, to further remove excess bass energy) and “Damping” control
adjustments (essentially mild equalization near the crossover point.) Either
of these tweaks may necessitate trimming the overall level of the satellites or
subwoofer, which is easily accomplished via the Sub/Sat Balance control. If all of
this seems daunting, we recommend that you consult your
JL Audio dealer for setup assistance and service.
Resources will be available on the JL Audio website at www.jlaudio.com, on
the CR-1 product page. For detailed information about powered subwoofer setup,
you can also download the Fathom, Gotham or E-Sub Owner’s Manuals from the
JL Audio website. While these manuals are most applicable to JL Audio’s powered
subwoofers, they also include general information about placement and setup
that applies to all subwoofers.