"Matthew Fowle" wrote in message

i remember reading something about a device which could be affixed to
wooden furniture which acted to send subsonic vibrations through the
furniture. i think it was called an acoustic actuator, but searching
for such on google's giving me nothing.

anyone have information on a) what its called or b) experiences with?

These have been around for a while.

Known variously to google as "Butt Shaker", "Butt Kicker", "Bass Shaker",
etc. It's up to you to dodge the sex toys...

The technical essence of these products is a robust bass loudspeaker with a
mass replacing or augmenting the speaker cone. You can pour some epoxy into
the cone of a woofer, let it set, attach it to a chair frame, and have a
similar effect.