I'm looking to build a sealed or vented cube subwoofer. What driver could I use that would work very well with this? Would the Tempest be a good choice? Blueprint 1503?? How large of a box would I need? The HE15 would be a choice, but its expensive and I'm trying to see if I could go another route. I would be powering this cube with one channel of my Samson S700, so 350w RMS. Ideas?