It is a bit tricky dimming electronic transformer type fixtures. It is best to ask for brand and models of compatible dimmers. Lutron recommends using a special dimmer designed for electronic transformers. Some transformers are supposed to be designed for standard dimmers but it isn't always that easy.

As to the buzzing all over, you need to get someone to look and listen to that.

Our home is full of low voltage halogen lights - tracks, pendants, you name it. I cannot listen to AM radio anymore when they are on as they make it buzz horribly - all but 2 stations.

We originally had them on dimmers and could hear the humming constantly. We were told by another electrician that the previous one had used the wrong dimmer switches and that we needed to swap them out for electronic ones, but they cost $150 each. Thus we opted to have all the dimmers replaced with traditional Lutron switches. They don't humm any more, but we still have the radio interferrence problem. Halogens are well noted for causing buzzing or humming sounds.

Love the light they put out, but not the heat (cannot leave them on when we are out of the room as they are a fire hazard due to how hot they get) or the buzzing radios.

Not much help to you, I know, other than to confirm that this is a common problem, though I have never heard of halogens buzzing when they are off.

Still, you might try getting rid of the dimmers and see what that does. It worked for us.

Lynne