least harmful light dimmer

Well, we love music, but we also love to cook. A dimmer on the lights over the island would allow us to adjust light where we will be prepping food, and those lights will be quite bright at the highest setting (generally, but not always a good thing). So I tend to agree with the designer.

Yes, dedicated lines would seem to be a good answer, and I am planning on it. But since dimmers can affect circuits other than the ones they are on (at least I thought so), I wasn't sure a dedicated line would do it.

If you decide to go with the dimmer, does a line have to be ran for this , or is there one already there ?

If one has to be installed, and since he is up in the attic, may as well have the dedicated line ran at the same time.

If the kitchen and listening room are on different circuits it will not matter.

Dimmers go a bad name for causing noise when they were a new thing. With those sold today I experience no problems. I even have one on the light over my turntable, and I can't tell from the sound if it is on or off.