Posted by FredT [ 68.201.202.11 ] on March 06, 2006 at 14:35:17:
In Reply to: Stage 4Pi improvement posted by LAL on March 04, 2006 at 11:39:45:
My 3 Pi's sounded very live to me with 3/4" mdf as the enclosure material and a single window frame brace between the woofer and tweeter. I subsequently lined the interior with 3/8" plywood panels attached with a generous layer of liquid nails, and this tamed quite a bit of the boominess. I suspect the culprit was the vibration in the enclosure walls, which I could easily feel by holding my hand on a panel while playing a recording with strong bass content. Adding the plywood panels did compromise the interior volume a bit, but the overall result was worth it. The 1-1/4" sonic barrier that LAL used is a multi constrained layer damping material which I would expect to make a difference if the speaker's liveliness is caused by the panels ringing.
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