Can I hook up a B&W ASW 2500 subwoofer http://www.bowers-wilkins.com/Downloads/Product/Manual//ENG_FP12203_ASW-2500_manual.pdf to a ROTEL RA970 BX integrated amp for stereo listening? The ROTEL does not have a seperate Pre and Power amp as per B&W Fig 4. Excuse if this is a totally Noob question.