I was running an onkyo TXNR 5007 pushing POLK LSI25 LSiC LSI9 LSIM702fx LSI7. It was running really Hot so I added an INTEGRA DTA 70.1 9 channel amp. Everything is much cooler and sound is great. Over the years the 4 ohm LSI speakers have worn out some receivers. My questions is.... Should I BI-amp my speakers and split up the power draw.