I have been a lurking in most of the build threads for sometime and felt a sense of motivation to retrofit my room a bit.
I bought the house new in 2004. When placed on a corner lot the house is equipped with a 3 car garage. I am not on a corner so I get a two car garage that is quite deep (extra bay used as a workshop). The space including garage is 52'x32'. The door to the garage opens to a hallway with a half bath immediately to the left then the staircase leading upstairs and finally the HT straight ahead.
One enters from the garage to the basement where all the fun is occurring. The room dimensions are 16' wide x 32' deep with a large bulk head I built to house the support beam and duct work (I packed this with loads of insulation Christmas Eve). I finished the basement several years ago at the request of my wife. The goal at the time was to provide my daughters a place to hang out with their friends. The rear portion of the space houses a home office.
Both of my daughters are now in college and one will be moving on to med school in the fall (budget). I converted the space to a "movie watching room" ~2 years ago and now hope to retrofit into a semi-dedicating theater minus the home office. I use the bulkhead as a natural divider. The theater portion is 17' X 16'.
When I finished the basement I coated the cinder block walls with 3 coats of drylock, framed, insulated with r-30 and drywall-ed with 1/2": I wanted the placed to feel more a part of the house and built a subfloor with pressure treated 2x4's in a grid, foam insulation, osb, then carpet .
When finishing several years ago I chose to place a tongue and grove drop ceiling using 12" x12" panels, retainer clips, and plastics rails. Time and my BFM THT have not been kind to the drop ceiling. The ceiling is warped in many places from the cheap clips detaching.
I had a week of vacation to use or lose and decided it was time for a drywall ceiling and soffits.
The budgets is rather tight for this project and I had to cut a few corners. Soundproffing is not a major priority so I will call it a sound augmentation. I tore down the drop ceiling and rented a drywall lift.