(Lots of hyphens in that title...I like it... I bet this topic has your full and undivided attention if you're here reading this.)   So let's get into the basic idea: crossing the ideas of Mr. Roy Delgado and Mr. Tom Danley on horn design, namely using a K-402 as the basis of a multiple-entry horn design--like the Unity Horn design of Sound Physics Labs.  The Synergy Horn of Mr. Danley is still patented (US8284976), but this design reuses the exact physical design of the Unity horn (U