I just bought a driver
http://www.thinkgeek.com/electronics/audio/6bd8/
and am in no hury to get a plate I have a couple other projects to complete
I tell you what though, I hooked that driver up to my 5 watt Epiphone
get-amp. and slaped the driver on my gong and wa frinkin la , it turned
my gong into a speaker . it sounds cool. I put a mic on each side of the
gong for a stereo effect . I like. its fun with a wah
I would do more research on plates before you have a go.
that one that that guy built sounds like a speaker in a trash
can
I think you want a plate that is 24 - 28 gauge steel