Wayne Parham Messages: 18756 Registered: January 2001
Illuminati (33rd Degree)
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Be careful with plywood though. The only product I can endorse is Baltic Birch. It is made with very thin laminates clamped under a lot of pressure and held with plenty of glue. This fills any voids present in the laminates with glue.
The problem with most plywoods is internal voids. Debris in the voids can buzz. And even if a sheet seems to be free of buzzes at first, it often times has voids that shed debris over time. So a panel develops a buzz after a few months or years. The vibrations from the speaker tend to shake loose debris, that then buzzes in the void.