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Thanks Andre for the link to The Guide to Acoustic Practice. It's great to
have a document that links all the different BBC reports together like that.
I especially liked seeing photos of the standard absorbers installed in
rooms. They look pretty good and I like the flexibility of being able to mix
and match them, as well as easily change them when needed. Especially
for us diy'ers who don't necessarily have a definite idea where we're going
this lets us play around with things until we find a combination we like.
I can see the utility of making some diffusers that fit the system and even
some modules that are simply flat and reflective.
One thing that strikes me in all the BBC documents, except the recent one
for the deep bass absorber, is their use of fairly thin absorption, usually
only 30mm (~1-3/16") with a 6" air gap.
I hadn't seen the A8 and A9 before (the same but for the front cover)
which contain two densities of mineral wool in front of a solid hardboard
panel which is itself in front of the air gap. The air space behind the panel
is then vented through holes in the sides.
Paul P
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