"Bob La Londe" wrote in message ...

Thanks Lloyd. That particular machine is inside an MDF cabinet which helps
a lot for sound deadening. You have to raise your voice to have a
conversation right next to it, but 15 feet away you can have an almost
normal conversation even with the shop doors closed. It could probably be
better, but I put lexan doors on the front rather than more MDF.

Broadcast station air booths, recording studio control rooms and such are typically glazed using 2 layers of lexan or plexiglas with dead air between...this arrangement blocks sound transmission remarkably well.