The Marantz, like all surround sound receivers, is designed to be use with a self powered subwoofer. The subwoofer that comes with the Sony is not self powered so you would have to add an amplifier to use it with the Marantz (which is an excellent sounding receiver).
Given the price if you are handy one of these might be useful
http/www.parts-express.com/cat/audio-amplifier-boards-modules/3464
but otherwise save some money and get a self powered sub.