I will be receiving a new Dayton sub tomorrow and being that my current sub only has a volumn knob, I am not sure how to set the other settings on the Dayton. How should I setup the crossover and phase settings on the Dayton? Also the crossover settings on my receiver is currently set at 150, should I leave it there? I have the Onkyo tx-sr601 receiver, Polk CSi20 center and Polk rm6005 surrounds. One of these days I will graduate from being a newbie but until then I really appreciate your guys advice!