Newbie to this forum. I just picked up a pair of terrific RT55i speakers...with stands....for $50. Love these! I'm running a Yamaha RX-V667 with discrete amps so I wanted to try a bi-amp test. I set both speakers next to each other; one was single-amp'd, the other bi. I fed a mono source into both and switched back and forth. Verdict? NO audible difference. They sound EXACTLY the same with either connection. Clean, punchy, precise (all good because I can use those extra amps for other speakers). What results have you all had with bi-amping?