If all else fails, use a relay to short the Valcom speech path, or power down the Valcom 24 Volt power when they're supposed to be silent.

As for the muffled sound, you have either got an overloaded amplifier, 1 or more 4-16 ohm speakers without 25 volt transformers, one or more bad speakers, or a 'tired' amplifier. In any case, you'll want to do an eyes on inspection and test of each 25 volt speaker.

As SAM said, T & M ONLY!!!! And the Impedance Meter will save you HOURS, or even DAYS.

One more possibility. I have seen neophytes try to use the 25 volt line power to power Valcom speakers! NO, IT WON'T WORK. If you're lucky there won't be any damage.


When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.