There are more efficient drivers available, if that matters.  As Romy pointed out, usually very different systems are used in PA and in homes.  I thought you were talking about a Front Loaded Horn, not a Compound horn.   "using the acoustic energy from both the front and rear of the driver in a horn loaded fashion." as you put it.   
  Yes, they have been built, e.g. Tannoy's Westminster & Autograph, Lowther's TP1, etc.   Sound is a matter of opinion, and taste...   I've experimented with them, very difficult to implement, and to balance the front and rear wave, much time-align...   I felt it was a dead end, and is why I'm now building a five-way FLH system.   YMMV, good luck!   Robert   |