dirkb wrote on Sat, 26 August 2006 02:50 |
I have a question on (non) parallel walls. How much of an issue is it to have some parallel walls in the CR if it's behind the listening position to avoid flutter?
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Hope it's OK to jump in and discuss even though Fran hasn't been by this thread yet.
Flutter is one of the easiest problems to fix, even if you don't choose to splay the surfaces. The simplest solution is absorption, but a somewhat irregular (diffuse) surface will kill it too. One effective but expensive way to deal with it is to use RPG flutterfree which is essentially a very small well 1D diffusor to target the higher frequencies that are flutter echo.
Another way is to put up some absorption. Thin panels will do fine for flutter, though you can make the treatments effective over a broader range if it helps the whole room plan. If 100% coverage will make the room too dead, use a checkerboard pattern where on opposing walls, one will have an absorptive square, and one will have a reflective square. This kills the flutter with only 50% coverage. Coverage with Celotex boards is also an option.
The other solution is to use some kind of irregular surfaced material instead of flat, smooth drywall (AKA sheetrock, gypsum board). In my current mastering room I installed ledgestone for the short length of parallel walls to the rear of the room. It looks great and kills the flutter without adding unwanted extra absorption.