JL Audio Fathom f112 Owner's Manual page 30

h) 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.
i) A series of quick, stepped tones will begin which are used by the A.R.O. soft ware
to set an appropriate bass level at your seat for the test. If these tones stop aft er
two to fi ve cycles, the "Calibrate" button's light will start to blink, indicating a level
setting error.
Slow blinking (approximately once per second) indicates the level selected
on the "Master Level" control was too low. Increase the Master Level control
approximately one eighth of a turn and go back to Step "g".
If the Calibrate light is blinking quickly (approximately 3 times per second), this
indicates that the "Master Level" was set too loud. Decrease the Master Level
control by approximately one eighth of a turn and return to Step "g".
j) When the "Master Level" is properly set, a slow series of tones will be played from
20 Hz to 100 Hz aft er the stepped, level-setting tones. During this process, the
A.R.O. system is taking a frequency response measurement at your listening seat.
When A.R.O. is fi nished calibrating, the "Calibrate" button will light and stay on,
indicating a successful calibration.
k) Return your Fathom's front panel controls to their previously determined settings
(before the A.R.O. calibration run) and re-tweak the subwoofer output level as
described in Step 1 (Level Setting) on page 28. Since the A.R.O. will smooth the
largest peak in the bass response at the listening seat, the apparent subwoofer level
may appear lower. Simply increase the subwoofer level until you are satisfi ed.
IMPORTANT! IF YOU MOVE YOUR FATHOM OR PRIMARY LISTENING SEAT
IN THE FUTURE, YOU WILL NEED TO RUN A.R.O. AGAIN. ANY PARTICULAR
CALIBRATION IS UNIQUE TO THAT PARTICULAR SUBWOOFER POSITION
AND LISTENING SEAT POSITION COMBINATION. SIMPLY FOLLOW THE
STEPS ABOVE TO CREATE A NEW CALIBRATION CURVE.
5) Extreme Low Frequency (e.l.f.) Trim
Use the "e.l.f. trim" control to adjust the extreme low bass extension of the
Fathom. Th is control allows -12 dB of cut or +3 dB of boost at 25 Hertz and is
particularly useful when using a Fathom (or two) in a small to medium sized home
theater. Since smaller enclosed spaces help to boost the level of the lowest bass
frequencies, smaller theaters can be overwhelmed by the strong low-bass output
of the Fathom subwoofer. Th is can create a "thick" or "bloated" character in the
lower bass region. Turning down the "e.l.f. trim" knob cuts the extreme low bass
level and alleviates this condition. Feel free to experiment and listen to a variety of
demanding material until you fi nd the best match for your room and your tastes.
Your Fathom is now optimized for maximum bass performance at your
listening seat. Congratulations!
Page 30
IMPORTANT
| Fathom f112 & f113