In article , Ignoramus1606 says...

I feel that some experimenting is educational, although there is some
point at which it will become more tiring than educational.

The nice thing about the sonex is it's relatively cheap and the
shipping won't kill you. If you buy a few hundred pounds of
sheet lead and find that it won't do, then you still have to
dispose of it somehow.

Plywood box, lined with sonex. Labyrinth to allow cooling air
and a big muffin fan, driven electrically.

Jim


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