Front Panel Controls In Detail - JL Audio Fathom f112 Owner's Manual

FRONT PANEl CONTROlS IN DETAIl

Power Switch
The "Power" switch determines the operational readiness of the Fathom
subwoofer and should be the only switch used to turn the Fathom on and off. Do not
use a power strip switch, switched outlet or any other external switch as these may
result in undesirable and potentially damaging transient pops. Do not unplug the
Fathom's AC power cord while the unit is turned on.
The power switch has three positions:
"On": The Fathom is fully powered at all times. Front panel lights are on unless
they have been turned off via the "Lights" switch.
"Off ": The Fathom's internal power amplifier is powered down. In this state,
a negligible current draw will exist for operating the main power relays. All front
panel lights are off .
"Auto": The Fathom will power up its internal amplifier when an audio signal is
present at any of its inputs and will power down the internal amplifier if no signal has
been detected at its inputs for thirty (30) minutes. When dormant, the Fathom will
draw a very small amount of current (< 5 watts) to power its signal-sensing circuitry.
Front panel lights will turn off when the Fathom powers down and light when the
Fathom powers up (unless they have been turned off via the "Lights" switch).
In the unlikely event that the Auto feature is not sensitive enough for a particular
system, use a Y-cable adaptor to split the incoming signal into both RCA or XLR
inputs on the Fathom. This will increase the input sensitivity by 6 dB. Please be
aware that if the Auto sensitivity is too high or if there is significant noise on the
input cable, the Fathom may not turn off as desired. If this happens, remove the
Y-cable adaptor or look for the noise source in the upstream components.
Automatic Room Optimization (A.R.O.)
A powerful feature of the JL Audio Fathom subwoofers is their innovative
Automatic Room Optimization (A.R.O.) technology. This one-touch system
serves to eliminate the single largest acoustic response peak in your home theater
at the main listening seat, greatly improving the in-room low-frequency response.
Calibration of the A.R.O. system is fully automated and takes only a few minutes to
accomplish. Please consult the next section of this manual for details on how to use
the A.R.O. system
Using the included JL Audio calibration microphone, the A.R.O. calibration
procedure takes less than three minutes. In brief, you will connect the included
microphone to the "Calibration Mic." input, press the Calibrate button, and then
hold the microphone at ear height in your main listening seat during the test. A
series of tones will be played through the Fathom subwoofer, and the room response
will be automatically measured, analyzed and equalized to eliminate the single
largest acoustic room response peak at your listening seat. For detailed instructions
on the A.R.O. setup procedure, refer to pages 29-30.
Calibration Mic. Input
This input is for connecting the supplied JL Audio calibration microphone to
the Fathom subwoofer. Connect one end of the supplied cable to the microphone
and the other end to this jack prior to using the A.R.O. system. The A.R.O. system
is specifically calibrated to this microphone and its connection scheme is specific to
the supplied microphone. The calibration sequence will not operate when a different
microphone is connected or if no microphone is connected.
Page 14
IMPORTANT
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