Barrie Heaton wrote: > How thick are the pieces you use or do you just build it up level with > the bracings Do you use any particular type of foam. I used what Yamaha sent. Maybe 4" thick, the same textured surfaces you see in recording studios although I don't think it matters too much. Cut slightly oversize for a friction fit flush with the back. This was model MX100A. A conversion kit was available which apparantly addressed this problem: model 100B, which sold for $185. We opted for the free foam and they're happy. Carl
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