An Odd Question

All this fretting about air on a g-string. 

Well listen with them in the room and then out and then you will know if a difference or not. 

High volume may cause an audible effect but I have one on a stand in my listening room and have never heard any effect.I would consider hard surfaces may have a greater  reflective effect.

Good mysterioso1, keep those guitars right where they are. I have a grand piano in the room. The degree to which the guitars will resonate if at all depends entirely on the volume. Same for the piano. I have stuck my head in the thing and I can't hear a darn thing over the noise of the Hi Fi. If the instruments are making any noise it is so far down you will never be able to hear it. 

Assumptions are the mother of all f--k ups. 

I personally think 'neutral' doesn't exist....except, of course, in your car or motorcycle.  Damn good thing, too.. ;)  *tease*