Room Acoustics Forum by Rives Audio

RE: How to fix this?

124.177.104.46

In Reply to: RE: How to fix this? posted by Barry on July 08, 2008 at 04:43:14

Fast reply due to hectic day.

I think the RPG diffusors shouldn't cause problems. Foam is often a narrow band absorber acting in the highs and/or the mids. The sheet on the wall may well be narrow band, especially since it's directly mounted. Mounting with an air space behind improves the low frequency absorption of all materials and mounting directly on the wall will always reduce bandwidth.

Re the fibreglass in the cylinders: what are the cylinders made of, how porous is the material and are there openings in it. If sound can't get through the cylinder you'll get little absorption except, perhaps, some bass absorption if they're open at the top and acting as a broadband Helmholtz resonator. If the cylinder wall is reflective at high frequencies you'll only get absorption below the frequency at which the cylinder wall becomes reflective. It's impossible to say anything accurate about the fibreglass in the cylinders without knowing more about the cylinders and also the type of fibreglass, its normal density, and how tightly it's stuffed into the cylinders.

David Aiken

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