I've got a dozen older DP-DMX20L units that are sending noise back into the electrical system and ultimately showing up in the sound system. Goes quiet at 0, 50 & 100% and the closer to 25 & 75% the louder the hum. Is this simply inexpensive dimmers or should I be looking elsewhere?
It should be noted that ALL audio signal cables are balanced XLR type, everything is powered from the same panel with the same ground (I know, I installed it.)
I actually didn't have this issue when I used a separate source for the lighting power.