Ok John thanks for the clarification. I may build the 3.5cf^3 ported enclosure since I have the driver and enough 1" mdf. I was thinking about borrowing an amp or even renting one and testing the sub in the listening room. If I'm not happy with the responce of both subs playing together, I can always sell the sub w the enclosure and put the money towards a 2nd EP500.

Demetrios