JL Audio Fathom SA-600W Owner's Manual page 31

| Fathom SA-600W
4) DELAY (Phase) Adjustment
Now using the same music material, audition different "HP out DELAY" settings
and choose the delay that further enhances the upper and midbass response. Delay
is given in milliseconds.
When connected to a JL Audio subwoofer, we recommend starting with 10
milliseconds of HP out delay, which compensates for the small delay inherent in
the SA-600W's built-in, box-correction EQ filter. Experiment with times just above
and below the 10 millisecond mark, perhaps up to approximately 14 milliseconds.
Choose the setting that most enhances the crossover region's response (subwoofer
and satellite playing together).
If you cannot hear a difference in the various "HP out DELAY" settings, leave the
control at 10 milliseconds.
5) ELF Adjustment (Extreme Low Frequency Trim)
Use the "ELF" control to adjust the extreme low bass extension of the SA-600W.
This control allows -12 dB of cut or +3 dB of boost at 25 Hertz and is particularly
useful when using a subwoofer (or two) in a small to medium sized home theater.
Since smaller enclosed spaces help to boost the level of the lowest bass frequencies,
smaller theaters can be overwhelmed by the strong low-bass output of the subwoofer.
This can create a "thick" or "bloated" character in the lower bass region. Turning
down the "ELF" cuts the extreme low bass level and alleviates this condition. Feel
free to experiment and listen to a variety of demanding material until you find the
best match for your room and your tastes.
Your SA-600W is now optimized for maximum bass performance at your
preferred listening seat. Congratulations!
Use pages 38-39 to record your amplifier settings for future reference.
Page 31