26 Billy Zoom 9 months ago Home dimmers will generate hum too, but I'm talking about the big grey boxes is theaters and clubs. The old ones were extrememly noisy. In the 70's and 80's, when real sound systems were being installed in venues, people were aware of the problems and most were upgraded, but some of the older venues still have dimmer packs from the 40's and 50's. To make matters worse, it seems the information didn't get passed down to the younger engineers and many of the brand new systems are as noisy as the 1940's units. It's a big horrible noise with a wide bandwidth and it's tone changes as the lights change. I recently had a run in with it at the Crystal Ballroom in Portland, an otherwise nice venue, but they've never upgraded the lights. The venue's sound guys usually don't belive that's where all the noise comes from, and we frequently have to shut down the mains power to the dimmer pack to prove it to them. If we want the superior tone of a single coil pickup, this is a cross we have to bear.