I'm curious as to why the 130v over the 75v or 95v?
Even though the amp will probably never be cranked up to max it is possible for peaks to exceed 100V. Besides, when you are talking lightning, another 50 or so volts shouldn't be a problem to the amp. We use 300V protectors on our 48V POTS lines, right?
Hal - The cable running up to the horns is a 2 conductor, black and white, maybe 12 gauge? It's connected to Com and 70v.
Yeah, I suppose. When I did it I was feeding two horns in the bell tower, the amp and player were in a closet below on the second floor of the church. The run was maybe 75 feet which I did in conduit straight up the top of the tower. So I couldn't see a reason for 70V, the distance wasn't that great and only two speakers. Matter of fact I had to turn it down because the church got complaints from people miles away.
Also had HV DC to a solenoid actuated hammer to strike the old bell. That was pulled in another run of conduit from the controller I located below the bell tower.
System was supplied by Chime Master with a QSC amp. There is no surge protection, never had a problem with lightning.