I have someone on craigslist near my area selling 3 sundown SA 8" v2s in a ported box tuned 'around' 36hz (Says he never measured to find out) But they also come with the SPL Coils all for 480$ But my main problem is getting an amp to power all 3, and electrical to keep up with it. Just going to end it here and see what you guys think if you want more info about anything please ask.