Is a dimmer noisy when it's turned OFF?


Friends, my wife wants to add a rheostat to the dining room ceiling lamp. I know that dimmers are big sources of electrical noise, could will it have any effect on my listening room power when it's turned completely off? Just want to be sure.
cymbop
no need for dimmers if you use corner lighting. Ikea has paper column style standing lamps. they have switches that sit on the floor and just a step turns them on. place in the corners the shed low diffused light. they can also act as sound treatments in the corners as well. nice trick.
=> http://www.ikea.com/us/en/catalog/products/30232225

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No , dimmers do not add noise when off . For that matter I haven't experienced any noise when they are on . I think it would take very sensitive equipment and a bats ear to hear any noise .
I agree with Tmsorosk, I have dimmers and hear nothing audible through the system.
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.
I think the poster meant do dimmers make noise when switched off. They shouldn't make any electrical noise when switched off because the SCR circuitry should be depowered. Now, if the dimmer is only turned down to minimum and not actually switched off, that may be a different matter. The SCR circuitry would still be powered and might generate some RF noise. The typical household dimmer is a low cost appliance using a switching device that reduces the average voltage to the light bulb. That's why they do not usually work with fluorescent or LED type bulbs because they need a minimum voltage level to turn on. They generate gobs of RF noise just like when you break/make an electrical circuit. My old ARC SP-6b preamp that I had a couple of decades ago was sensitive to dimmer noise. I banned all dimmers from our house back then. Simple solution.