I really enjoyed these two episodes. Great work!
I have two questions on the topics.
One question is about covering acoustics panels with fabrics. Most fabrics, for instance velvets, are usually not specified as being acoustically transparent. If you hold such fabrics over a sound source you will hear that they have very little dampening (perhaps a little bit in the very high frequencies, but no effect at all on lower frequencies). Let say you cover broad band absorbers with velvet that is not specified as being AT. I don't think it matters much if the absorption happens in the cover fabric or in the absorber panel. This begs the question if there is any point in using AT-fabrics for covering absorbers? I guess there might be a very slight effect when using non-AT fabric for covering diffusers (causing slight high frequency roll-off), although I think the effect might be almost negligible. So why is "everyone" so obsessed with using acoustically transparent cloth on acoustic treatments? Is this just a myth or has anyone actually tested it (scientifically)?
I am of course speaking about fabrics that are reasonably thin, not thick carpet-like or waterproof materials.
There was also a listener question in one of the episodes (I do not remember if it was episode 1 or 2) about baffle walls in home theaters. It seemed Anthony Grimani and Scott Wilkinson did not understand the question. This surprised me a little bit because I would have guessed that the question was about the use of THX baffle walls in an home theater environment. My guess is that Anthony Grimani actually knows a lot about baffle walls from his previous experience. I am a bit surprised it was not touched upon or mentioned at all. What do you guys think the reason behind this is? One would think that Anthony would have mentioned it if he meant it was important for acoustics in home theaters...
Perhaps anyone would like to comment?