Originally Posted by KCWolfPck
Just for clarification, should the volume be set to 0 prior to entering the menu....then adjusting the Noise level until you get 75 dB? Or does it matter because the Noise level sound doesn't take the volume setting into consideration?
The Main Volume setting (i.e., the volume knob on the Front Panel or the volume buttons on the remote) doesn't make any difference. Just so you know, whatever gets set in Setup / Speaker Calibration corresponds to what happens during normal playback when the Main Volume is set to -10dB, but you don't have to set the Main Volume to that before setting up Setup / Speaker Calibration.
However, there IS an apparent bug, which makes the test tone for the Noise Level line depend on the setting in the Left Front line. So set the Left Front line to 0dB before adjusting the Noise Level line.
I recommend you adjust the Noise Level line for (roughly) 75dB SPL prior to running ARC Measurements. You should also adjust the volume knob inside your subwoofer (or any other speaker with its own internal volume control) to yield (roughly) 75dB SPL when fed the same Noise Level you just set above. To do that, set the line for that subwoofer (or speaker) to 0dB in Setup / Speaker Calibration so that it is just being fed the Noise Level you picked above, without modification.
When you run ARC Measurements, the only value it will actually use out of that menu is Noise Level, so you don't have to reset or adjust any of the other speaker lines after making the adjustments described in the last paragraph. ARC Measurement also ignores whatever the Main Volume setting happens to be. An ARC Upload loads values for all the speaker lines according to what ARC has determined.
The above SPL settings need to be ballpark close only. ARC will set the precise values for you -- using the Noise Level value to configure the volume of its test sweep tones. Don't worry about the low frequency response of your SPL meter when setting subwoofer volume. For the preliminary setup we are talking about here, "slow response" and "C" weighting, with the SPL meter pointed straight up at the ARC mic position #1 will be just fine.
ARC uses a broader range of frequencies to determine the "best" speaker volume trims, so the values it uploads to this menu may differ a bit from what you would get if you did it yourself with the SPL meter. And the SPL level these ARC loaded values produce may also differ a bit from the 75dB SPL you just set above. But it should be close. And whatever SPL value you end up with after the ARC upload should be the same for all your speakers. If not, something is wrong.