Bill Epstein Messages: 1088 Registered: May 2009 Location: Smoky Mts. USA
Illuminati (2nd Degree)
I've used the DE-250 with Altec 811B, Bill's Woodhorn and now the H290. With one important caveat, the H290 sounds best but you must completely cover the outside surfaces of the horn with rope caulk, a.k.a., Mortite.
I looked into the B&C horn you mention but passed not just because it differs from Wayne's design, especially important with the no-longer-new crossover, but for the issues I had with the also aluminum, 811B. No damping or cutting of vanes kept it from over-emphasizing the upper mids.