Originally Posted by NorthSky
Ok, if you have a leather couch, yeah, you can put a blanket on top of it to take Audyssey measurements with the mic.
And if you have a glass coffee table between you and your screen, put a blanket on top of it too.
And if you have large reflective windows all around, close the curtains.
Brief, cover any highly reflective surface near by.
Originally Posted by Soulburner
But then if after calibration you uncover them and go back to business as usual, you're going to have problems.
I agree with both of you, that in general you don't want to change anything between calibration and playback. But without wishing to be argumentative, I would cite the blanket over the couch back as an exception to that general rule. Getting the Audyssey mic too close to a hard surface such as a leather fabric "may" cause problems. No guarantee that it will, but it may. That is because the mic can pick-up short wavelength, high-frequency reflections from the hard surface only 3"-6" away, let's say, and attempt to over-correct for them. In my room, that created a rather harsh treble sound even with XT-32.
There are three ways that you can try to avoid that comb filtering effect from having your mic too close to a hard surface during calibration. The first is to move the mic forward another 12" or so. The second is to raise the mic 6" or so above the surface of the couch. The first two were often recommended by Audyssey when someone asked about proximity between the mic and a leather chair back. The third method is to temporarily cover the hard surface with something absorbent, like a soft towel or a blanket.
But all three measures are temporary, and just apply to the calibration. If you move the mic forward away from your chair, it is not recommended that you hunch forward where the mic was during movie or music playback. Similarly, if you raise the mic, you don't have to put your chair on risers, or sit on pillows to get up to where the mic was. And you don't have to leave the towel or blanket in place either.
I think we tend to obsess about this stuff a lot, as Jerry said in response to the jokes a few posts back. It may not be necessary to worry about doing any of the precautions I mentioned to get a good calibration. But if you are concerned, or are hearing something amiss in the higher frequencies, then finding a way to avoid comb filtering during calibration is worth trying, and the temporary blanket method is a good one.