I currently dug out my old 25 year integrated amp to drive my subwoofer until I get the money to get a high powered mono amp. I currently just use the left channel to drive the sub. Would it be better to run a Y-adapter to both the left and right channel and then run both channels to the sub (i.e. left red and right red to sub red and left black and right black to sub black)? Or does this cause bad things to happen? Thanks, Paul.