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Author Topic: Modes vs reflections.  (Read 1218 times)

Bill_Urick

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Modes vs reflections.
« on: March 08, 2009, 08:16:17 am »

Any practical or theoretical insights?

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Sigert

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Re: Modes vs reflections.
« Reply #1 on: March 08, 2009, 08:19:24 am »

Meaning the differences between the two phenomena?
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Bill_Urick

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Re: Modes vs reflections.
« Reply #2 on: March 08, 2009, 09:14:46 am »

Differences, frequencies affected, effective treatments.
Anything at all.
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Good sense is, of all things among men, the most equally distributed; for everyone thinks himself so abundantly provided with it, that those even who are the most difficult to satisfy in everything else, do not usually desire a larger measure of this quality than they already possess.

Ethan Winer

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Re: Modes vs reflections.
« Reply #3 on: March 08, 2009, 01:53:14 pm »

Bill_Urick wrote on Sun, 08 March 2009 09:14

Differences, frequencies affected, effective treatments.
Anything at all.


Ah geez, this could be a long one, but I'll be short and to the point because your questions are not very specific. Laughing

All acoustic problems are caused by reflections. Modal ringing, skewed response, flutter echo, excess reverb - all of it.

What treatments are effective depends on the frequencies and what you need. Absorption always works, but diffusion is sometimes a better choice. For example, diffusion can reduce flutter echo and comb filtering without removing energy from the room. With "porous" absorption like rigid fiberglass, the thicker it is, the lower in frequency it absorbs to.

Acoustic interference causes peaks and nulls at predictable frequencies based on the distances. Room modes are a subset of interference and happen at only those frequencies related to the spacing between two opposing boundaries. Versus acoustic interference that can happen outdoors with a single boundary such as a large brick wall.

--Ethan
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