I have the Kef PSW2500 just how I want it now, but am intrigued by what would happen if I added the old Eltax to the mix. The Eltax has good range, but it does boom a bit, it has 175watts to play with and a 10" downfiring front ported layout. I bought a splitter last night, and am going to hook up the Eltax sub as well, just to see what it sounds like. Going to set the crossover very low. Apart from a bit of boom, the Eltax sub wasn't all bad, terrible with music though, so will switch it off for CD's. I'm thinking that I might place the Sub at the other end of the room (25ft length and 13ft wide). What would be the best way to go about it? Or shouldn't I bother? Advice please . And should I set the Eltax to a 180 degree phase?