I was running the subwoofer through the sub output of the C45, however I just bought another one so I'm running them through the L/R outputs. The XLS112 has volume control so it's no an issue anymore. The trim button helped, but eventually I just adjust it on the sub itself. As far as cables, I'm not running anything special. For many years I refused to accept the importance of cables. I'm running RCA Anticables from the MVP871 to the C45 and I recently bought better power cords for the MC601's. Other than that, nothing exotic or special. My speaker wire is 12 gauge, something I picked up online. I just bought a C200 and I'm waiting for it to be delivered!