Is the Tempest X 15" suitable for a relativley small ported box, around 5 ft? I am having trouble with Winisd, my own lack of know-how, and am not able to get numbers that make sense to me. If the Tempest is not, please make suggestions. I prefer a dvc 4 ohm that can be driven with 350wpc stereo amp. The room is 20x30x8, the mains can handle down to 60hz easily. Thanks for any advice you can give.