Therefor beside the obvious cosmetic look, whats different?
The difference is that the horns are on a different power supply than the ceiling speakers! Read what I said above in my first post about noise on the power wiring generated by a noisy speaker amp and investigate that!
If you can't get anywhere with this and the problem is causing problems instead of just being annoying, consider removing the speakers and replacing them with standard 70 volt ceiling speakers and horns. You will need to use three PA amps or a single multi-channel unit, each channel input or amp input can supplied by the zone audio outputs of the Valcom 2003A maintaining your zone paging functionality.
-Hal
