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Listening Room Design - Rolling up my sleeves...

Yggdrasill

AK Subscriber
Subscriber
We are going to start rebuilding our house soon and I have a the rare opportunity to design - architecturally - a listening room for the basement. It will be for music and movies, as well as other activities, but it will be designed and outfitted primarily for music. The area I have to work with is roughly 15' x 20-30' by 8' to 10' high. This latter number is the one I really have to nail down as I can't change the basement height after construction.

My main speakers are line arrays, a combo of eight 6" woofers with six Graebner Neo-8 planar mid-tweets. However, I plan to use a variety of speakers in the room.

I have been looking for resources on listening room shape and size, and came across recommendations by George Cardas on his site. He talks about Fibonacci sequences and the Golden Ratio in creating room dimensions as well as speaker placement; he claims that the ideal shape is a Golden Trapagon. Unfortunately, he offers no references, or even any rationale (scientific or other) to explain why the shapes and dimensions he espouses have the acoustic effects they do.

Also, the Cardas listening room on his website video doesn't seem to follow any of his design principles.

Is there anything to his claims? Can anyone offer any other suggestions, resources, references for listening room design? I really appreciate any thoughts on this.
 
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I know a guy the built his room from cinder blocks, and filled them with sand - talk about sound proof!
 
I know a guy the built his room from cinder blocks, and filled them with sand - talk about sound proof!

I don't think I could pull that off in Seattle for seismic reasons. The walls will be ICF (Insulated concrete forms), so eight inches of concrete with three inches of foam on either side, plus whatever I put over the foam.
 
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