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Page 29 | Fathom f110
4) Applying Automatic Room Optimization (A.R.O.)
You are now ready to apply the power of JL Audio’s exclusive Automatic Room
Optimization system. is system will measure the response of the subwoofer at
your primary listening seat and apply a powerful equalizer to tame the peaks caused
by room modes, resulting in smoother, more accurate bass performance. If you
are using multiple Fathoms in a master/slave con guration, you will only need to
address the unit designated as “master” to perform A.R.O. calibration for the entire
subwoofer system. Note that all front-panel signal processing is defeated during
A.R.O. calibration, regardless of the knob settings. Normal operation is restored
once calibration is complete.
a) Set the Main Power switch to the “ON” position and be sure the Fathom’s
indicator lights are switched “ON” via the “Lights” switch.
b) Remove the calibration microphone from its protective pouch and connect its
cable to the mini-XLR jack on the Fathom’s front control panel.
NOTE: A.R.O. Calibration is only possible when the included JL Audio test
microphone is plugged in to the Fathom front panel. e “Calibrate” feature is
disabled with no microphone plugged in to prevent accidental loss of settings.
c) Connect the microphone to the other end of the mic cable and temporarily place
the mic in the primary listening seat. If you have a microphone stand, you can
place the microphone at head height and position in the primary listening seat.
d) On the Fathom’s control panel, press the “Calibrate” button. e green light on
the “Calibrate” button will ash slowly, indicating that calibration will begin in 5
seconds.
e) Within 5 seconds of pressing the “Calibrate” button, return to your primary
listening seat and hold the microphone in your normal, seated head position at the
approximate height of your ears.
f) A noise sequence will be played through the f110 that sounds like hashy static
(like when your old FM radio was between stations). e sequence will last
approximately 3 minutes. During this process, the A.R.O. system is taking a
frequency response measurement at your seat and correcting the problems it
nds. e A.R.O. system also compensates for any before & a er level di erences
so that your f110 will have a similar perceived loudness a er the calibration
process. When A.R.O. is nished calibrating, the “Calibrate” button will light and
stay on, indicating a successful calibration.
IMPORTANT
IMPORTANT! MAKE SURE THE ROOM IS QUIET DURING A.R.O.
CALIBRATION! TURN OFF ANY NOISY APPLIANCES NEAR THE LISTENING
ROOM (DISHWASHERS, WASHING MACHINES, ETC.)
IT IS PARTICULARLY IMPORTANT TO TURN OFF AIR CONDITIONERS OR HEAT
PUMPS DURING CALIBRATION. THESE FORCED-AIR-TYPE HVAC SYSTEMS
CAN CREATE MODERATE LEVELS OF 15 – 20 HZ NOISE THAT MAY INTERFERE
WITH CALIBRATION.