Originally Posted by ozziegt
Is there any reason everyone runs soffits all the way around? I am wondering if I should go with a soffit or instead opt for the ceiling height and just do a soffit in the front and back where I am going to have ducting.
Looks good and provides a good place to mount cornice molding and/or a small light tray for indirect lighting, See Damelon's it becomes a place to install recessed down lighting without punching a hole in the sound containment drywall bunker.
Place to run duct work horizontally around the room to the proper locations and to use the soffit as a dead vent, something you will want to do with your proposed HVAC design
Other unused parts can be used as a bass trap by filling with insulation and covering with a fabric bottom, See Sandman's and Damelon's
You can use it as a chase to run ALMOST ALL of your rooms wiring, High voltage, Speaker and other low voltage, rather than punching another set of holes in the walls. Outlets are mounted in Columns, Stage and riser not in the walls. Bring all wires into the room thorough two holes with conduit up in the soffit. One for HV the other for LV. Once all wiring is done, plug the ends of the conduit.
You can build a projector hush-box integrated visually with a soffit.
Bottom line is soffits are your friend if you have the headroom.