JL Audio f110 Front Panel Controls In Detail, Power Switch, The power switch has three positions

FRONT PANEL CONTROLS IN DETAIL

Power Switch

The “Power” switch determines the operational readiness of the Fathom subwoofer and should be the only switch used to turn the Fathom on and off. Do not use a power strip switch, switched outlet or any other external switch as these may result in undesirable and potentially damaging transient pops. Do not unplug the Fathom’s AC power cord while the unit is turned on.

The power switch has three positions:

“On”: The Fathom is fully powered at all times. Front panel lights are on unless they have been turned off via the “Lights” switch.

“Off ”: The Fathom’s internal power amplifier is powered down. In this state, a negligible current draw will exist for operating the main power relays. All front panel lights are off .

“Auto”: The Fathom will power up its internal amplifier when an audio signal is present at any of its inputs and will power down the internal amplifier if no signal has been detected at its inputs for thirty (30) minutes. When dormant, the Fathom will draw a very small amount of current (< 5 watts) to power its signal-sensing circuitry. Front panel lights will turn off when the Fathom powers down and light when the Fathom powers up (unless they have been turned off via the “Lights” switch).

In the unlikely event that the Auto feature is not sensitive enough for a particular system, use a Y-cable adaptor to split the incoming signal into both RCA or XLR inputs on the Fathom. This will increase the input sensitivity by 6 dB. Please be aware that if the Auto sensitivity is too high or if there is significant noise on the input cable, the Fathom may not turn off as desired. If this happens, remove the Y-cable adaptor or look for the noise source in the upstream components.

Automatic Room Optimization (A.R.O.)

A powerful feature of the JL Audio Fathom subwoofers is their innovative Automatic Room Optimization (A.R.O.) technology. This one-touch system serves to eliminate the largest acoustic response peaks in your home theater at the main listening seat, greatly improving the in-room low-frequency response. Calibration of the A.R.O. system is fully automated. Please consult the next section of this manual for details on how to use the A.R.O. system.

Using the included JL Audio calibration microphone, the A.R.O. calibration procedure takes less than three minutes. In brief, you will connect the included microphone to the “Calibration Mic.” input, press the Calibrate button, and then hold the microphone at ear height in your main listening seat during the test.

A noise sequence will be played through the Fathom subwoofer, and the room response will be automatically measured, analyzed and equalized to eliminate the single largest acoustic room response peak at your listening seat. For detailed

instructions on the A.R.O. setup procedure, refer to pages 29-30.

Calibration Mic. Input

This input is for connecting the supplied JL Audio calibration microphone to the Fathom subwoofer. Connect one end of the supplied cable to the microphone and the other end to this jack prior to using the A.R.O. system. The A.R.O. system is specifically calibrated to this microphone and its connection scheme is specific to the supplied microphone. The calibration sequence will not operate when a different microphone is connected or if no microphone is connected.

Demo Button

The Demo button triggers a 20 second long tone sequence that briefly demonstrates the sound of the Fathom subwoofer. The Demo function is useful for

IMPORTANT

PROCESSOR (BALANCED OUTPUTS) RECEIVER / PROCESSOR (UNBALANCED OUTPUTS)

PRE OUT

FRONT L REAR CENTER

OUTPUTS

OR

FRONT R REAR SUB

es with part 15 of the FCC rules. Operation is wing two conditions: (1) this device may not rference, and (2) this device must accept any ved, including interference that may cause n.

FATHOM REAR CONTROLS (MASTER)

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