I have a very well refurbished Marantz 2500 (http://www.hifiengine.com/manual_library/marantz/2500.shtml), and I would like to add an AR subwoofer (FPS10 - here's an example http://www.bhphotovideo.com/c/product/630129-REG/Acoustic_Research_FPS10_FPS10_Flat_Panel_10.html) that I had for a couple of years and never used yet. The problem is that I do not know how this is supposed to connect to an old style amp/receiver.