teh plenum, IMO, seems to be as good as a dsb, but is more work to set up, and much more work to change or work on, i know of a few people who have plenums, and cannot complain at all, but say that if they ever set up a new system that they will use a dsb, because of the fact that the plenum is just more work(only to set up and replace or work on),but to have, they seem to be as good as a dsb