Just got off the phone with PhaseTech and Connie was super nice and super helpful. She's emailing me the info on replacement parts, which they have, even the sock. She also told me about a trade up program they have where I could ship them in and get the brand new equivalent at dealer cost. I dunno if I want to go there, but at least I can price the replacement drivers and sock and go from there.
The unfinished cabinets... I think that's just the way they did it, being that a sock covers the whole thing. That kinda makes sense to me anyway. I'll report back when I learn some more.