A combination of the shorter (correct) port lengths, and acoustic foam (tall eggcrate) seems to have fixed the sound problems. Alvin burned out the fuses in the amp from having it too loud, but says the bass is nice and tight. I haven't heard it yet! We're going to glue the last pieces of foam (ran out of spray glue) and get some new fuses.

I also want to measure its actual frequency response curve to compare against the theoretical one.