this will be a 3.15^3 box. using the dayton DVC12. tuned to 22hz. using 4" pvc with a 90degree elbow to get the port in the front. with the front hole flared with a round-over bit. (thanks for the idea Patrick s.) the corner moldings and top will be natural stained oak and the middle painted with a crinkle type paint. the spikes will be the parts express dayton ones.