I recently purchased a Cerwin Vega 122/124 Stroker 12" sub (older cooler looking model 1200 rms 2400 peak) from a friend of mine used for $200 and it came with a ported box built to spec. For now im running it on a Boss 2000 watt amplifier while i save for a new better one. It SLAMS so hard on the low bass hits on songs. (Grillz, muscle cars, break ya ankles, break em off etc.) but when it comes to higher bass notes (mercy etc.) the bass is like non exsistent. Why is that? I don't know the exact specs of the box but its pretty big looks like 2.0 cubic feet? Its a long box barley could fit in the opening of my 2008 Civic 4dr. It looks to me as a good quality box. Maybe its the amp settings? My input is all the way. (i know its bad, just wanted to see how it would sound) but i didnt mess with anything else. Oh the amp came with a bass knob too.