Dimmer noise - DP-DMX20L

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.

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