Avoid windows if you can. Even closed they're horribly noisy. My back yard is a forest. Even so the noise coming right through the window panes tool 1/2" thick MDF panels to shut out.
Avoid architects if you can. They charge a fortune, and love complicated expensive designs that they use to impress and distract from the fact any competent designer could do better for a fraction of the cost. Which I know, having taken competing bids from a number of them for my room. In my case the best design was also the cheapest of the six we got.
Avoid dedicated circuits, plural. You want one. One. Read the above again. If that doesn't do it, listen to Michael Fremer at 15:50
https://ultimist.com/video/2018/07/21/michael-fremers-listening-room/
Avoid architects if you can. They charge a fortune, and love complicated expensive designs that they use to impress and distract from the fact any competent designer could do better for a fraction of the cost. Which I know, having taken competing bids from a number of them for my room. In my case the best design was also the cheapest of the six we got.
Avoid dedicated circuits, plural. You want one. One. Read the above again. If that doesn't do it, listen to Michael Fremer at 15:50
https://ultimist.com/video/2018/07/21/michael-fremers-listening-room/