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Old 13th April 2011, 11:56 PM   #11
Karl71 is offline Karl71  United States
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Paul -

Regarding a sealed box with a Qtc of .707, I found an online calculator that gave me 2.72 cu.ft. Now that's a big box.

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Karl
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Old 14th April 2011, 12:26 AM   #12
pjanda1 is offline pjanda1  United States
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Well, a little bigger than 2. Notice that I didn't say 2 yielded a .707 q, but it might get pretty close with some stuffing (which the online calc probably doesn't include!). And as fullranger folks tend to avoid BSC, and all fullrangers are subject to doppler distortion, I tend to recommend boxes a little smaller than .707 for most folks. You are of course free to build whatever size you want, and encouraged to share the results!

Paul
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Old 14th April 2011, 05:35 PM   #13
Karl71 is offline Karl71  United States
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Paul -

How much stuffing would you suggest initially for the 2 cu.ft. boxes?

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Karl
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Old 14th April 2011, 05:56 PM   #14
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.707 can often be maintained in a slightly smaller box with heavy fill. I've had good results attaching fiberglass to all interior walls and then filling with wool... cuts down on all resonances.
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Old 14th April 2011, 06:21 PM   #15
pjanda1 is offline pjanda1  United States
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I'd put some thing on the back, top and one side wall. Eggcrate foam, or maybe a couple layers of that foam carpet pad that is made from chunks of different densities. Not for stuffing, but to control higher frequency reflections. Then I'd probably start with a pound of polyfill in each one. Those are my suggestions for cheap and easy. Fiberglass performs better, but is worse to work with. The right type of wool is surely great, but more expensive.

Paul
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