Checked out the garage sales in the area today and one of the last ones was in a ritzy area of town. Ended up picking up these: Nautilus HTM2 center channel a pair of Nautilus 805 speakers Price? He was asking $100 each and I talked him down to $175.00 for all 3. I don't know if he had no idea of their value or just had more money than brains. Either way, I wasn't asking any questions. The cabinets have a few rub marks on them from whatever they used to rest on but are otherwise perfect. I have one question on these. It seems they can be bi-amped. Do they have to be bi-amped? If not, do the terminals have to be jumpered or do I just wire to a specific set of terminals?