Is a dimmer noisy when it's turned OFF?

Some dimmers do in fact make noise that's clearly audible in some systems. We went through 3 or 4 dimmers before stumbling on one that didn't make noise in ours.

Same with transformers (as for 12V lighting systems).

To assert that the phenomenon doesn't exist based on a single experience is no more valid than if I asserted that the phenomenon must always exist based on my single experience (which of course I don't). The varying experiences posted on this thread evidence the reality, which is YMMV.

Tonywinsc,

Tmsorosk expressly asserted that dimmers do not make noise even when on. See the post two above mine. The following poster seemed to agree. Sorry if it wasn't clear that I was responding to those comments.

I concur that (IME) dimmers do not make noise when turned off.

Stringreen,
Good description. We also get that effect from leaving various appliances plugged in (microwave oven, television, etc.) even when they're switched "off". It's pretty low level, but for insanely critical listening we unplug as many as we conveniently can.