Originally Posted by Alex solomon
When I run ARO I had to turn the gain up to 3 O'clock. Should I leave it there or dial it back to zero before running Audyssey from my Onkyo receiver? I have the F112.
The level used for A.R.O. calibration has nothing to do with
the actual level at which sub will be calibrated to the rest of the system for operation. A.R.O. is a closed-loop setup and has no knowledge of or interest in the pre-pro's signal. It is not uncommon to have to dial the sub's gain pretty high to calibrate A.R.O. This is to get the level of the test signal well above the room's noise floor (to ensure an accurate measurement). In 99% of the cases, you will need to turn the sub's level back down to achieve a proper integration with the rest of your system.
The more low frequency noise is in a room, the higher you have to set the level on the Fathom to calibrate... the bigger the room, the higher you have to set it as well... Many people fail to *ahem*
read the manual thoroughly and attempt calibration with their HVAC system running and then find that they can't get enough level for calibration, too.
If you're using your receiver's or your pre-pro's subwoofer level setting features, you can set the Fathom's Level Mode on "reference" immediately after ARO calibration (this mode defeats the level knob), and use your receiver/pre-pro to set levels correctly to integrate with your entire speaker system.
So in a nutshell:
Run ARO FIRST (and don't worry about the position of the level knob needed to do it)
Switch to REFERENCE Level mode (if you don't have enough level or prefer to have the knob work, switch to Variable)
Adjust levels with your pre-pro or receiver
Perform other calibration settings.
Hope that answers your questions.
JL Audio, Inc.