I would like to build a sub to be used for sound quality. I have a Crown CDi1000 that I'll power the sub with (about 1kW into 4 Ohms). I'd like to keep the cost of the driver at or around $300.00 USD. I've seen quite a few people using the Infinity Kappa subs, but I'm not sure how well they do in a sealed cab. Any suggestions? Thanks!