Originally Posted by profchaos71
I have mine at 0db right now and just under 1/3 gain which seems to be doing the trick.My only concern is the distortion of signal from the AVR.I have seen others with SVS subs that have their gains at less than half and the sub level in the AVR at like -9.I don't know how they get adequate bass like that at all.I know i wouldn't with this AVR.
I set the gain of my sub such that the AVR gain is low - -8/-9dB. The SUB gain knob is at 10-11 o'clock. This gives me headroom to increase the SUB level at the AVR to my liking for music listening (-2dB to +2dB).
If you increase the SUB gain after the MCAC and then decide to do other calibrations, MCAC will ask you to turn it down and then you can't compare apples to apples by switching memories. So pick a setting for the SUB gain that is low enough for MCAC to do it's job and stick with it.
Then do the adjustments of the sub level at the AVR.
Don't worry about clipping or distortion at the SUB preout of the AVR. This is a low power signal that should not have issues if the AVR is designed properly. The circuit has to accommodate the full input signal span and the +/-10dB gain for the SUB level by design.
The clipping, if any, could occur in the SUB amp if the AVR output level is at the maximum end and the SUB gain is set high too. If you notice that the SUB is working too hard - i.e. producing unnatural sounds and moving as if the cone will fly out of the case any moment or it ends its movement abruptly, then you are in a need of a more powerful sub