i've tried 2 boxes, and i've yet to get "there" the first box sounds absolutley amazing, goes really deep. only complaint, it sounds like its hitting the spider maybe?(what i was told) certain bass notes make a metal-to metal sqeaking sound. (defintaly from inside the box, not a car/hatch rattle) 34 to 39hz sounds great, exactly how i loved it specs on box"(26x12x18) .7cu ft behind sub, 44" long port (11sq in. port area) next box: .3cu ft behind sub, 48" long port (10sq in port area) this box allowed the volume to go further before; the bass was a lot tighter, and hit harder; but again, making a metal-to metal clipping/sqeaking sound. it was a tigher, higher hz sounding box, it didnt go as low as the .7 cu ft box, it just hit a lot harder. was in a 96 civic hatch, amp was a rockford 550w rms, 800w peak what are people using for these sa8's? i'm looking to save trunk space, and that .7cu box was as big as i want (26x12x18)