You dont build boxes out of plywood or particleboard, for a proper
build, you build them out of MDF, preferably 3/4" or 1"

For home systems, the 1" MDF or HDF is best, but it is way to heavy to
move all the time. For a permenant install, the MDF would be fine. For
portability and strength, plywood is the only way to go.

As to particleboard, what do you think MDF is?


Obviously, these guys know nothing at all about building loudspeakers:

http://www.loudspeakers.net/files/specs/new/tfr64a.pdf

"Enclosu 13-ply 18 mm Baltic Birch"

DJ, since you know so much more about about building SR loudspeakers than
Community does, why not try to share your wisdom with them, and get them all
straightened out?