My room is 7.4' H X 13.7' W X 19.8' L and I would kill for a larger room. I have whisper clips / channels on the four walls and ceiling with only one layer of 5/8" drywall. The next level up of isolation is to add a second layer of drywall with Green Glue in between. My room sits below our family room and is pretty quiet except when I am driving things pretty hard and there is a load low bass passage.
If I had more room and design options, I would make the room 16' wide at a minimum and 26' long and would have added the second layer of drywall. I would also like more windows and /or more lights.
Good luck with this. Don't stress over the 'perfect' dimension. Give yourself enough room to have sound treatments to help there and find an acoustician and designer.
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