What's the best location for a skylight?

I have some placed at those points in my room and it sounds great. Give it a try!

There's not much that i can add to that other than the irregularities in the ceiling should provide "some" form of natural diffraction even with the skylight(s) closed.

Depending on how far you could open them, this could also be used as somewhat of a bass trap. The more that you opened it, the greater the amount of low frequency leakage and the less "bloat" that you might experience. You might even be able to fine tune both the frequency range and amplitude that would be most affected using your "heavenly bass trap". You could actually chart your results by taking frequency response measurements with the skylight in various positions.

Obviously, this would also play with ultimate spl levels as you would be altering the amount of air volume that your speaker were trying to load into and pressurize.

Sounds like something to check into with a LOT of potential for variables. Sorry i can't help you any more than this. Like i said previously, i was "wingin' it" for this one. Albert might know a little more since it appears that he has skylights AND has had a professional acoustician survey his room. Sean
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Definitely in the ceiling! On a more serious note, I would avoid one in a listening room. If you insist on one, I would keep it away from the speaker end of the room and probably not over the listening position. I am certain you will get all kinds of answers on this, most, like mine, based un some educated (or maybe uneducated) guess. Why bother if it means you may have to add all kinds of acoustic treatment to cure the problems this will no doubt create.

I agree with PBB about not placing the skylight near the first reflection points of the speakers on the ceiling. If building codes require placement of a skylight, then you can use diffusion materials rather than absorption. RPG and Echo buster sell these products. ASC and Echo Buster will provide a free evaluation. I received an ASC tubetrap package containing interesting articles on placement of their products. Art Noxon President of ASC sent me the package containing some old stereophile reviews regarding the use of both diffusion and reflection. Another article of interest was on stereophile’s review of Thiel 7.2’s regarding ASC MATT test (you can download this review from Thiel’s website). Jon Risch’s website has a lot of info on DIY acoustic products that really work. He can be found at Audio Asylum – Tweekers Asylum

Best of Luck