After a considerable amout of discusion with knowledgeable people about the adition of a second EP600, and having the offer of assistance in placing and calibrating the pair, the decision to try it was made today. I ordered the second sub from the factory outlet which is showing two weeks, this wil give me a bit of time to finish up cabinets, and a few other things before its arrival. So in about 3 weeks, should have both placed and set up and will see how much of a differance it makes, hopefully all good.