JL Audio Fathom IWS-SYS-2 Owner's Manual page 14

Master level Knob
The Master Level Knob is used to control the output level of the Fathom IWS
when the Variable Level mode is selected on the front control panel.
When rotated fully counter clockwise, the Fathom IWS's output will be fully
muted. When at the "0" or straight up position, the Variable gain level matches
the Reference level setting. When turned fully clockwise, the Fathom IWS's
output level is 15 dB higher than the Reference setting.
lights
The "Lights" selector switch allows the user to select one of three indicator
light modes.
"Off" turns off all of the front panel LED's at all times.
"Dim" sets all of the front panel LEDs to a low brightness level when the
Fathom IWS is turned on.
"On" sets all of the front panel LEDs to full brightness level when the Fathom
IWS is turned on.
IMPORTANT: WHEN TROUBLESHOOTING OR CALIBRATING THE A.R.O.
FEATURE, MAKE SURE THAT THE "LIGHTS" SWITCH IS SET TO "DIM" or "ON."
lP Filter
The Low Pass (LP) Filter selector switch determines the operating mode of the
Fathom IWS's built-in low pass filter.
"Off" defeats the low pass filter, completely removing this circuit from the
signal path.
"12 dB" sets the roll off slope of the low pass filter to a 12 dB per octave slope
(Butterworth alignment).
"24 dB" sets the roll off slope of the low pass filter to a 24 dB per octave slope
(Linkwitz-Riley alignment).
The 24 dB setting more aggressively attenuates high frequencies above the
LP Frequency setting (see below). If you are using the Fathom IWS's built-in
low pass filter, experiment with the LP Filter slope setting to achieve the best
transition to your satellite speakers. If you prefer to use the filters and bass
management features in your receiver or preamplifier, defeat the
on-board filter by selecting the "Off" position.
If the Fathom IWS enclosure is placed close to the listening position, it may
be very easy to localize the sub's output. Experiment with the low pass filter to
make the subwoofer less easy to localize.
lP Freq
The Low Pass (LP) Frequency selector knob allows the user to choose the
roll-off frequency of the Fathom IWS's internal low pass filter. The frequency is
variable between 30 Hz (full counter-clockwise) to 130 Hz (full clockwise). This
knob does not affect the input signal in any way if the LP Filter switch is set to
"Off". 80 Hz is a commonly used filter frequency and usually serves as a good
starting point for adjustments.
Page 14
IMPORTANT
| Fathom IWS