Tblasing, yes the Yamaha P3500 does have 1/4" but once my setup is complete I will be using electronic crossovers with only have XLR.
William, I tried the XLR to 1/4" transformer from Radio Shack and it did not help. I was wanted to make sure something wasnt wrong with the amp so I connected a walkman to it and there was no hum or buzz so it must be coming from the Denon 4800.
I did find a Rolls MB15 active RCA to XLR convertor that sounds like it for this problem. I will have to buy and try it out. Also discovered pro equipment wants a higher signal level than home equipment can provide too.