JL Audio Fathom f112 Owner's Manual page 15

| Fathom f112 & f113
Demo Button
The Demo button triggers a 20 second long tone sequence that briefly
demonstrates the signals used during A.R.O. calibration. The Demo function is
useful for showcasing the output capability of the Fathom and to verify that the
Fathom (or multiple Fathoms) are operational during system troubleshooting.
To activate the demonstration sequence, press and hold the "Demo" button for
approximately 2 seconds (this built in delay helps prevent accidental activation).
Pressing and holding the "Demo" button will activate the demo sequence even if
the A.R.O. defeat function is active (see below.) Once the demonstration sequence is
complete, the Fathom will return to its previously set operating condition.
Defeat Button
The "Defeat" button turns off or "defeats" the A.R.O. calibration system and
equalizer. Use this feature when you want to be sure that the A.R.O.'s equalization
is not in the signal chain. You can also use the "Defeat" button to audition both the
normal and the A.R.O. optimized settings in your home theater room. This is a
great way to audibly verify what effect the A.R.O. has in your room.
If "Demo" or "Calibrate" is pressed while the defeat function is active, "Defeat" is
automatically canceled. No other front panel controls will alter the A.R.O. Defeat state.
Calibrate Button
The Calibrate button activates the ARO test sequence. The calibration routine
will not start unless the supplied JL Audio test microphone is plugged into the
Fathom subwoofer. Once the calibration routine is complete, the green light in the
center of the "Calibrate" button will light and remain illuminated. These settings
are stored by the Fathom and will remain in memory even if power is disconnected.
During the ARO test sequence the Calibrate button's green LED will alert the
user to two special conditions:
1. "Subwoofer level too low for A.R.O. calibration" via slow blinking,
approximately one blink per second
2. "Subwoofer level too high for A.R.O. calibration", approximately three
blinks per second.
Input Mode Indicators
The Input Mode indicator LEDs show the input mode, either "Master" or "Slave",
selected by the switch on the Fathom's back panel (unless the "Lights" switch is set to
"off"). For further details, see page 20.
level Mode
The two-position Level Mode switch allows you to select between the following
modes:
"Reference"
In this mode, the Master Level control knob has no effect on the Fathom's output
level. Use this setting if you will primarily be controlling the subwoofer level via
your receiver or preamplifier/processor. For those of us with small children or
overenthusiastic teenagers, this mode of operation will prevent direct manipulation
of the Master Level.
"Variable"
In this mode, the Master Level control knob determines the output level of
the Fathom subwoofer. This mode is also useful when level matching the Fathom
subwoofer to a pair of stereo speakers in a two-channel system. Variable level
operation is needed for proper A.R.O. calibration.
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