I'm purchasing all Volt 6's for my surrounds (ported) and Atmos (sealed) speakers. The surrounds will be hidden in columns, so I'm not concerned about finishing them. I am going to increase the surround enclosure volume to the higher end of the design (.31 cu feet)for better bass extension. I have several questions: 1) If I use mdf instead of plywood for the box sides, what thickness would you recommend (I'm using 1/2 inch mdf for the back)? Or does using Baltic plywood provide other acoustic benefits? 2) The Atmos enclosures I plan on lining with at least 1 layer of 5/8" drywall to maintain room soundproofing. Is one layer enough, assuming the entire box is built using 3/4" mdf? 3) Is it worth it to increase the volume of the Atmos enclosures (will I hear the difference) ? 4) Finally, if I do increase box volumes to the upper design limits, will I still be able to use the stock crossovers? Thanks!