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Room Acoustics Forum by Rives Audio

RE: All listening rooms need to be symmetrical

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In Reply to: RE: All listening rooms need to be symmetrical posted by KlausR. on April 12, 2009 at 23:08:00

So would you suggest I try my best to cover all first reflection points and try to take the walls out of the equation or experiment with asymmetric speaker placement in conjunction with diffusion?

Follow Ups:

RE: All listening rooms need to be symmetrical - Ethan Winer 11:35:44 04/14/09 (0)
> So would you suggest I try my best to cover all first reflection points and try to take the walls out of the equation <

Yes, that's my first choice for sure. If the absorption is symmetrical, that will force symmetry at mid and high frequencies. That is, one absorber would go on the wall, and the other on a stand to be the same distance away from your ears.

--Ethan
RE: All listening rooms need to be symmetrical - KlausR. 00:02:02 04/14/09 (0)
There is no evidence in the scientific/technical literature that first reflections have detrimental effects. In my case and to my ears first reflections do not affect imaging and asymmetric placement of loudspeakers has no negative effects.

I don't think that, in general, there is reason to apply first reflection treatment. However, each case is different so each case should be considered individually. It also depends on the loudspeakers. Loudspeakers behaving badly off-axis might benefit from first reflection treatment.

Aubility thresholds for first reflections are up to -25 dB for music, keep that in mind should you decide to treat using absorption. Another problem with acoustic treatment is that once you start treating first reflections you'd have to treat them all since those reflections that are not treated are easier to perceive and might then become a problem. Further, one should use absorbers that are effective down to about 150-200 Hz. They should further have approximately the same absorption coefficient throughout the frequency range.

Klaus

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