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Page 29 | Fathom f212
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 primary
room mode, 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.
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) Flip the Fathom’s “Level Mode” switch to “Variable” and turn the Master Level
control to the “12 o’clock” position. If you were already in “Variable” mode, make
a note of the volume position you established during Level Setting (Step 1) before
turning it to the “12 o’clock” position for A.R.O. calibration. In most cases, you
will need to tweak the overall level of the subwoofer a er the A.R.O. calibration is
run, but you need to know your prior setting to begin that process.
c) Set the LP Filter to “OFF”
d) Verify that the “e.l.f. trim” control is set to “0”
e) 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.
f) 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.
g) On the Fathom’s control panel, press the “Calibrate” button. e green light on
the “Calibrate” button will turn on, indicating that calibration will begin in 5
seconds.
NOTE: If you have already run A.R.O. once, the “Calibrate” light will already be on.
Each time A.R.O. calibration is run, the previous settings are erased and the new
settings are stored.
IMPORTANT
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.
DO NOT TALK, COUGH OR SNEEZE DURING CALIBRATION AS THIS MAY
CORRUPT THE CALIBRATION MEASUREMENTS.