Horns... Ewwww.... Good for PA systems..... Thats about it.... I forget the model number but Klipsch has a 70V version of the SA-3 that sounds great tapped anywhere from 10-30 Watts. The reason for 70V in a situation like this is pretty much wiring. You're probobly looking at a minumum of 20 speakers. Home running all those to separate amps is not so good in a commertial situation. You'll sacrifice some bass response (But not much if you upgrade to the AUdioPlex 70V Transformers) but the subs will pick that back up.... And subs definatly should NOT be 70 volt.. Hope that goes without saying.....