Okay I've done some research and not finding all my answers. So I'm here for advice.
Not even considering A/V equipment yet. Typical colonial home in Northern VA (sunken living rm). HT will go in basement below (13' W x 20' D x 7' H). Three sided concrete walls, and concrete slab.
I've included pictures of the space below. You can see in the duct work where the ceiling drops. The shelves at the end will come out (that would be my screen wall).
Based on research was going to go with 2x3 studs, clips, hat channel, 7/16 osb, gg, 5/8 drywall on walls (will dd w/gg, on back of common wall to rest of basement).
Ready to finish the basement next week. I won't be doing ceiling and floor yet but need to plan for it.
I wanted to use drop ceiling in basement for access to plumbing/electrical etc. but have learned for HT it is pointless for soundproofing and a waste of other soundproofing you may have done, so will plan on clips, channel, dd. Can I use drop ceiling in rest of finished basement without issue?
1. If I float the entire wall using rsic or other equivalent under base plate and on top plate do I still need to use clips and hat channel on walls?
2. If I float the entire wall as above do I need to float the floor or can I carpet direct to slab?
3. I have plumbing out to a detached shop on 'front'/screen concrete wall that has ball valves and drain screws to winterize shop if necessary (see picture below). I will need to access this. How do I isolate an access without compromising the entire soundproofing? Should I just make a 3' closet/storage down that entire wall? If so how should I continue soundproofing in that closet to prevent 'leakage' upstairs? Would I use another solid core door with weatherstripping on closet like the HT entrance door?