Can I suggest when you fur out the walls in the basement go with 2x6 not 2x4s and then also add cross braces in between the studs and insulate well before you sheet rock.
Of course go over kill to on electrical boxes and separate 20amp breakers and at least 12x3 wiring. If you are going with anything like a 1.2k amp or may in the future add 220-240 as well
I also ran conduit in the wall to the ceiling in case I ever go over head for a projector etc.
I did this and the noise and resonance is way reduced with the thicker wall and cross braces. Most folks do not all any cross braces and feel that only the drywall screws will hold the studs in place.
I found that they will vibrate and setup their own harmonics. Maybe the 2x6 Vs 2x4 is over kill
Anyway I like the deeper wall with more and better insulation factor as well.
PS looks great so far and a fun project congrats