I have the answer your looking for! We just finished remodling the den, which is where the audio & projection systems are located. My electrician promised me that the low voltage lighting (12 volt) he would put in wouldn't make any sound. Well, I went along with his suggestion, and he was right! He used a unit made by "Elco". I believe the modle number is EL1499R. The cost was just under $26 each at the electrical supply. Each unit has its own transformer, but I can't hear any sound comming from them, and neither can anyone else! The dimmer that we're using is made by Lutron, and is called the "Spacer System". Very cool dimmer; works off an IR remote, and can be programmed for 4 different lighting levels. Hope this helps! Ken