I got a fairly smooth finish on my 2pi surrounds without much effort. I used a 3/8" nap roller from The Big Orange Box. I rolled the first coat fairly thin and went over it a couple of times to smooth out the blobs and ridges from the roller. The second coat went on heavier, but again I rolled it pretty aggressively to spread the material around and level out the boogers. Your speakers look great - can't wait to hear your review!