JL Audio f212 owner manual Extreme Low Frequency e.l.f. Trim

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. software to set an appropriate bass level at your seat for the test. If these tones stop after two to five 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 after 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 finished 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 satisfied.

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. This 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. This 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 find the best match for your room and your tastes.

Your Fathom is now optimized for maximum bass performance at your listening seat. Congratulations!

IMPORTANT

Page 30 Fathom f212