Why not horns?

I had a visit last week from David Wall of Snob Productions. He installed and calibrated my XTA DP-224 Speaker Management System for me.
This effort replaced my DBX Drive Rack PA.

With a tool like the XTA in the hands of a skilled sound engineer like David, every parameter can be adjusted and all guesswork eliminated.

I don't think it is possible to get to this place with pre-packaged speaker systems. One amp per driver and universal adjustment capability has proved to be the answer for me. Turns out my horns are even better than I previously thought.

Does anyone else out there have experience using XTA?

Check these out:

GP Unicorns.

Uses a single full range horn loaded Walsh DDD drivers.

Mapman- I've been unable to determine where the horn is in this design and I can't really get my head around the concept of an omni horn.

Please explain.

The cabinet is a rear loaded horn I believe. It is used to extend the low end output of the DDD driver I believe.

A Walsh driver, including the ddd, transmits sound through wave bending for higher frequencies and operates pistonically for low frequencies, which is where the horn is applied much like it would be in any rear horn loaded design I believe.