This one is out of my experience...... but on the 12's 3.5 net tuned to 34hz is good. You might wanna play with port area, 48-60" of port 46" IMO would be fine 1500-2000 watts..... i read on another post someone was asking joeX and he suggested around 60" of port.... might get more feed back if you post in the subwoofer section ... or search through other sa-12 posts, sa-12 is talked about ALOT on this forum, lots of builds.