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Join Date: Sep 2004
Location: Near the lovely City by the Bay
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I have the same receiver, and have a Rythmik LV12R sub, and I am confronted with a similar issue that I am trying to sort out.
Prior to the Audyssey MultiEQ XT32 calibration kicks off, the receiver instructs you to adjust the gain on the sub manually while pink noise is playing - such that the Audyssey mic senses 75dB volume level in the room. I had a Denon 3313 and a Marantz SR5007 before (BeeMan458 has the SR5007, if I remember it right) - both of which have Audyssey MultiEQ XT, but I did not have a sub at that point. The setup sequence might be different between XT and XT32, or maybe it's the same with both flavors of Audyssey, but having a sub in the mix changes the setup procedure.
Once, I manually adjust the gain on the sub to get as close to 75dB as possible ( I get 76dB at the closest value I can set the gain knob to), the rest of the Audyssey calibration sequence kicks off, with the trademark chirps. Once the calibration is complete, I find that Audyssey has set my front speakers to 40Hz and the sub gain to around +0.5 to +1.5 dB on various calibration runs. I change the crossover to 80Hz after the calibration, and I perceive that I am losing chunk of midbass frequencies at this setting. If I revert back to 40Hz, there is too little output from the sub. I try to raise the sub gain to +3 dB, and I get a decent amount of sub action.
Something is frankly messed up in my setting, and I need to investigate further, but the point of my post is that the Onkyo TX-NR818 receiver's implementation of the Audyssey MultiEQ XT32 calibration makes you manually adjust the sub gain so that the measured SPL for the pink noise is 75dB, prior to calibrating the speakers. Hope that clarifies the OP's question.