My stereo hi fi amp has outputs for 2 sets of speakers that I can drive at the same time. We listen mainly to music but want to be able to play home cinema DVD's with the heaviness that only a sub gives. I have a DVD connected to my HiFi amp. Is there some way that I can connect a sub to my second set of speaker outputs for when we are watching home cinema & thus leave my stereo system uncompromised? I am not allowed any surround speakers due to wiring & siting issues. I admit that at the moment the use level would not justify rears & centre speakers and I could not match the sound of my existing stereo pair.