Peel drywall off in areas where treatment is desired. Stuff cavity with Safe n Sound. Cover cavity with stretched fabric or linen. Add moulding to suit taste to cover edges.

About to do it in a bar in the washroom corridor.

Low (no) profile solution that is reversible if you keep the rectangle of drywall removed.

With a modern hard surface living space- leave openings open. Open windows. Sound has to decay into something to reduce in volume. Creating a larger container or paths where reflections cannot recombine with the direct signal will improve sound quality.

Yes, QS series speakers could even out the soundfield and allow you to listen at a lower output overall. Less energy = less problems to deal with. More speakers in more places is always a good strategy for non ideal setups (usually in surround though)

Think of lighting a room, Are 2 bright lights or 6 potlights better? Well.... you will have to decide based on being there and personal taste. smile