Get a powered subwoofer. Dai-chi is a good brand, bang of the buck ika nga. Very few Pro-logic AVR have subwoofer (low) out jacks so the way to go is you rca line out and just use the cut-off freq control in your sub. Remember, low freq signal is non directional so one of the two (L/R) channel can be fed to the subwoofer line in jack. Another option is to directly feed the speaker out (spkr B) to the sub speaker in. If you only use your sub-woofer for your dvd player you can use the sub out of your dvd player assuming if it is of the generic brand.