I can't really give you much of an opinion on the amp, however, if you're going for spl over quality, I'd stay with the recommended 2 ft^3. However, if you're like me and want quality over quantity, I'd go with 2.2 or even larger to increase capability down low. Although this is my first build ever...im pretty sure i want more SQ than SPL..so i'll go for maybe 2.3 cuft..you think i will hit around 120 db with 2 sealed at 700 watts? which amp do you run or you would run?