Length limits vary with the kind of signal -- digital things like HDMI are apparently more distance sensitive than others. One of Alan's articles talks about this a bit.

Biggest worry with a normal RCA coax connection is ground loops -- a long wire will normally be enough to take you from one circuit to another and so ground loops become more of a possibility.

The reason for cubic footage mattering is exactly as you suspect... the further you are away from the speakers the more "space the signal has to cover" so the old inverse-square law starts to kick in.

At high frequencies things like ceiling heights don't matter so much because you're mostly dealing with line-of-sight, but "bass goes everywhere" so cubic footage matters the most when you are choosing a subwoofer or full-range mains.

Last edited by bridgman; 03/31/05 02:27 AM.

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