JL Audio Fathom f110, Owner'S Manual

Page: 14 / 72

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FRONT PANEL CONTROLS IN DETAIL
Front-Panel Power Switch
Th e “Power” switch on the front panel 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.
Note: 220-240V Fathoms also
have a rear master power switch located next to the IEC power cord socket.
On these models, the front panel power switch must be in the “Off ” position prior
to operating the rear panel power switch. See page 22 for more information.
Th e front panel power switch has three positions:
“On” : Th e Fathom is fully powered at all times. Front panel lights are on unless they
have been turned off via the “Lights” switch.
“Off ” : Th e Fathom’s internal power amplifi er 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” : Th e Fathom will power up its internal amplifi er when an audio signal is
present at any of its inputs and will power down the internal amplifi er 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. Th
is will increase the input sensitivity by 6 dB. Please be aware that
if the Auto sensitivity is too high or if there is signifi cant 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. Th is 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
Th is 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. Th
e A.R.O. system
is specifi cally calibrated to this microphone and its connection scheme is specifi c to
the supplied microphone. Th
e calibration sequence will not operate when a diff erent
microphone is connected or if no microphone is connected.
IMPORTANT