Tweaks when building a listening room?

Double-rock the drywall and use the very best sound insulation you can afford between the studs. There's a very dense specialized batting for sound, or blown-in is excellent as well. If you plan on running any systems in other rooms you may consider running some wires before the walls are buttoned up. Cat-5, speaker wire, and a set of coaxial wires would all be useful in running an extension system. I also did two dedicated 20 amp circuits and kind of wish I'd done a third.

Good luck!

I know its not cheap, but have you considered using the spray foam insulation ?

We did the whole house ( outside walls / attic ) last year with this to save money and it also did a good job of I guess you could say soundproofing the house.

If interested, contact me and I can send a link and it will show a video of the work that was done.

I recently finished a dedicated 2 channel room and used double 1/2 inch drywall and all walls were double insulated before the drywall went up. I too brought in two 20 amp circuits and two 15 amp circuits for power.

The best tweaks you'll make will be after the room is finished using room acoustic panels.

If you are considering a dedicated circuit: Use(as least) two runs(keep 12" separation between the two) of 10-2 Romex(equiv of 4Ga), and(minimum) hospital grade outlets(ie:http://cgi.ebay.com/Leviton-Ivory-HOSPITAL-Receptacle-Outlet-20A-8300-I_W0QQitemZ250202544990QQihZ015QQcategoryZ41985QQcmdZViewItem). Also- Consider Auralex, or some of the substitutes available on eBay, to deal with the reflections inevitable in a listening room. Click on topics: (http://www.asc-hifi.com/acoustic_basics.htm) (http://shop.ebay.com/items/__acoustic-foam_W0QQ_nkwZacousticQ20foamQ20QQ_cqrZtrueQQ_nkwuscZcousticQQ_nkwuscZfoamQQ_trksidZm38)