I know what they are and what they do, thanks 
Anyone use one regularly? Ready-made or home-made? Pros and cons of each?
I know they're not intended to be 100% soundproof, but surely it's possible? At least 80%?
What about size ratios? Back when I first heard of the idea (in the Guitar World letters section) I believe the author suggested it should be about 2x the size of the cabinet, so for a 1x12 cab that was about 18x18 it'd be 36x36 for good air flow and cab resonance. Anyone stick to this? I've seen a small 4x12 in one that had about 4" clearance (if that much) all around, and it did sound fine to me.

Anyone use one regularly? Ready-made or home-made? Pros and cons of each?
I know they're not intended to be 100% soundproof, but surely it's possible? At least 80%?
What about size ratios? Back when I first heard of the idea (in the Guitar World letters section) I believe the author suggested it should be about 2x the size of the cabinet, so for a 1x12 cab that was about 18x18 it'd be 36x36 for good air flow and cab resonance. Anyone stick to this? I've seen a small 4x12 in one that had about 4" clearance (if that much) all around, and it did sound fine to me.
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