Isolated ground in dedicated room/new construction?

@ronboco

Yes, and that includes the branch circuit wiring from the load side of the switch to light fixture(s). When can lights are used in a ceiling it can be a challenge to route the new dedicated branch circuit cable(s) from the parallel running lighting branch circuit wiring. Same for maintaining a distance from the can(s) that house the LED lights.

@jea48 

Thank you for the info. I didn’t think about that when I built my room. I have LED track lights on dimmer switches. Would it present as sounding grainy /static? I figured the recordings that have some grain were from the recording. 

Would it present as sounding grainy /static? I figured the recordings that have some grain were from the recording.

Possibly.

For a test, turn off the circuit that feeds the dimmers and LED lights at the electrical panel. Then listen to your audio system if you can hear any difference.

(Turn off the circuit that feeds the dimmers? If the dimmers have internal back lighting they still spew garbage onto the AC line. Even if the dimmer switch is turned off. If you do hear a difference for the better from your audio system then turn on the breaker at the electrical panel and listen again. You may find with the dimmers turned off with their switch the dimmer does not put out enough noise to affect the sound of you audio system.)

If you do hear a difference for the better then just use a table lamp with an incandescent light bulb for general light in the room for serous listening to music.

Would you please explain to me the reason for not using metal boxes?

I would have thought (just guessing) that a metal box that is grounded by the conduit would act as a shield around the outlets.  What is the reason for plastic boxes?  Thanks!

@jea48 

Excellent idea. I’ll try that this weekend. 
Happy listening !

Ron