Jvogt, nice post. I just did a room very similar in my last house also, including drylock, etc. Did not do the floor s with studding though. What is the reason for studding the floors? (BTW, if you do stud any studs that meet the concrete should be pressure treated water resistant wood, with thin foam insulation meeting concrete under the studs to prevent moisture absorption. Also, I would be hesitant to place vinyl sealing for fear of trapping humidity and the potential of mold growth. Mold is a huge problem in housing today. In fact, I've recently read stories of people having such severe problems they had to tear their homes down. Insurance companies are so terrified of the problem that they are starting to cancel policies and placing homes in a special database when homeowners place claims on water damage (a precursor to mold). Do a google search of this as the Boston Globe has an excellent database online as well as others, I'm sure. Along those same lines, you will still, even with drylock need some dehumidifier system as you will not be able to eliminate moisture in a basement completely.
I had a dehumidifier and ran it intermittently which helped keep it very dry and comfortable. A
Also, I found that my sealed, double blueboarded, highly insulated room became VERY warm. I solved this with a split system A/C unit, which is the best way to go since it is the quietest ( I tried Mitsubishi which was a little too loud. You may want to check out the Sanyo's which I believe are the quietest) Your condenser is outside, and you only have a 3/4 inch pipe to run into your listening room. Also, because you're in a basement, for comfort/health I would suggest an ERV fresh air exchange unit, which will bring in fresh air from outside and if like me you live in a cold clime, recycle some of the heated air with cold, fresh air from outside. This also helps deal with the mold/moisture issue.
I had a dehumidifier and ran it intermittently which helped keep it very dry and comfortable. A
Also, I found that my sealed, double blueboarded, highly insulated room became VERY warm. I solved this with a split system A/C unit, which is the best way to go since it is the quietest ( I tried Mitsubishi which was a little too loud. You may want to check out the Sanyo's which I believe are the quietest) Your condenser is outside, and you only have a 3/4 inch pipe to run into your listening room. Also, because you're in a basement, for comfort/health I would suggest an ERV fresh air exchange unit, which will bring in fresh air from outside and if like me you live in a cold clime, recycle some of the heated air with cold, fresh air from outside. This also helps deal with the mold/moisture issue.