Amp "Hum" caused by dimmer switches


I just recently got an Acurus 100x3 amp to drive the front 3 speakers of my home theater system and I am disapointed to find out that my room light dimmer switch is causing a very noticeable "hum" that can be heard from the listening position when no audio signal/ low passages are present. I did not have this problem using the amp in my harmon/kardon receiver. I do not want to remove the dimmer and go to an on/off switch and do not have the money for a power conditioner. Am I out of luck and have to resell the amp? I bought it used from this sight so I can not return it. The amp sounds very nice when the lights are not in use. I'd love to get some sound advice! Thanks!
brentski71
Also try an AC line conditioner - borrow one from a local dealer for audition. A Chang Lightspeed 3200 or etc. is not that expensive, cheap if bought used & resellable if no help.
I second the recommendation to upgrade your dimmer. Lutron makes a number of high quality wall box installable dimmers. I use 11 of their Diva Series units in my home. Even when they are all on, no hum. Other problematic items are diode (capslite) bulbs, anything with a high/low switch that uses a diode (will drive class b amps (usually subwoofer) crazy).

Another suggestions would be to use a different line to supply the audio system (or dimmer). Best would be a seperate dedicated audio line. Use a very low wattage bulb with no dimmer. Or if you want the ultimate no noise dimmer, replace the dimmer with a variac (variable autotransformer). They don't install cheap, but are silent.
The Lutrons are worth a try as is using a different circuit if you can. None of those worked for me, but shielded interconnects between the preamp and amp completely eliminated the hum for me. Now, it's not easy to find shielded interconnects that aren't a little muffled, but it was the only thing that worked for me, and I did find one that I like.
Khaki8 and Brentski71. Yes, I am using a line conditioner and have fourteen dedicated runs to my audio system as well. I did not have any noise problems before the line conditioner or the Quiet Lines, however there was a performance gain with each of these.

I witnessed an active demo showing Quiet Lines plugged into a noisy outlet on the main floor at CES, whereupon some very obvious buzz and hum was reduced to inaudible. This was what made me think about your situation. There were hundreds of electrical powered things going on, not to mention the lighting. I thought that if it worked there, maybe it would help you.

The comments by Bob bundus are probably correct. The quality of the dimmer is a likely source of the hum. I have no way of knowing which of you (could/ would?) replace this noisy dimmer yourself. Electricians fees and markup on parts could easily run half the price of a set of Quiet Lines. This is why I suggested getting a set for trial, before investing any money.

If you have no other source, I would let you try my filters and see if it fixes your problem. I would prefer shipment by air each way though, so I could return to normal pretty quick.