I spent a gob of money on a dedicated two-channel room 2 years ago, managing to avoid most of the usual pitfalls.
One of the most successful money pits was Quietrock 545. It REALLY works. 5 layers of drywall, one layer of sheet steel, 1 1/4" thick. Thing about walls is that they flex with the sonic compression wave, turning your drywall into a very low class speaker. Q 545 is a beast that does not flex. Good sound insulation to boot.
Glue and screw construction. None of this nail gun crap. I used two elastomeric products from Chemlink, M1 and BuildSecure. Many cases.
Dimensions also matter, as your intuition tells you. Don’t listen to the usual suspects and their snake oil here; actual scientific research has been done on this subject, and it’s absolutely free. Check out the School of Acoustics at the University of Salford (UK). They did a quarter million simulations to find that MOST rooms are poor, a third are OK, and 2% are good. Half inches matter - I’m serious.
Good luck!
One of the most successful money pits was Quietrock 545. It REALLY works. 5 layers of drywall, one layer of sheet steel, 1 1/4" thick. Thing about walls is that they flex with the sonic compression wave, turning your drywall into a very low class speaker. Q 545 is a beast that does not flex. Good sound insulation to boot.
Glue and screw construction. None of this nail gun crap. I used two elastomeric products from Chemlink, M1 and BuildSecure. Many cases.
Dimensions also matter, as your intuition tells you. Don’t listen to the usual suspects and their snake oil here; actual scientific research has been done on this subject, and it’s absolutely free. Check out the School of Acoustics at the University of Salford (UK). They did a quarter million simulations to find that MOST rooms are poor, a third are OK, and 2% are good. Half inches matter - I’m serious.
Good luck!