I had never heard of the Bliesma T25 before your post...just checked the spec sheet, looks like an outstanding driver! I repeat: someone is very lucky, these should be outstanding speakers!
Rick, can you educate us DIYers, what are your thoughts on passive radiators? You typically create ported speakers, or occasionally sealed box speakers, so why the shift? How do passive radiators compare to ported and sealed designs, and what criteria should lead one to prefer one design over the other?
Thank you, Rick!