I inadvertently (screwed up) hooked up the bi-amp feature on my Yamaha RX-3050 to my Polk Rti-9 front speakers and forgot to remove the jumper on the speakers. It tripped out my surge protector. When I discovered my error I removed the jumper and tried it again but could not tell any difference with or without the bi-amp hook-up. Could I have damaged my speakers or amp by hooking it up wrong? Thank you for your input.