Thank you Wayne for all those precisions. I've got another question before starting build the prototype - I hope I'm not abusing of your patience... I've read your responses on other topics and your position seems be that trying to get more bass from 4Pi bass reflex deteriorate the midrange quality. What about changing BR to Horn-like enclosure? Do you have any opinion/information on altering the 4Pi using something like JBL "scoop" (4530) or the JBL C34 ?