Help

I have a Rotel 1572 integrated amp and B&W 603 speakers. I am unhappy with vocals in all genres. Too much sibilance! Sources are a Cambridge CD transport, a Rotel RCD 1572 CD player, both are running through a Denafrips Ares II DAC. My turntable setup is ok but not great, sounds better than both CD sources. I am about to give up and start over. Any advice out there?