Why not just get a powered sub-woofer and be done with it? The HK 3470's amp section is adequate enough and the Cambridge Audio 540 DVD player more than holds its own with both CD's and DVD's. For the time being, enjoy your music and when the urge to spend money on gear overpowers your common sense, then upgrade. Who knows where you'll be or what you will be looking to do by then.
Regards, Rich
Regards, Rich