I have a Teac Reference CR-H238i cd-reciever unit with Cambridge Audio S30 bookshelf speakers. I thought it sounded very good. I was curious about the audio line out and decided to connect it to the Tape 1 input on my vintage Onkyo A-5 amplifier. Wow, now it sounds even better, with a fuller, wider soundstage. I was originally planning on adding a powered suboofer to the Teac, but the vintage Onkyo amp does not have that type of connection. So, my question is, can I still add a powered sub to the Teac, even though the S30's run through the Onkyo? Or when you use the line out is all of the audio being by-passed to the external amp?Or could a passive sub be connected somehow?