Reply to Sound quality of rmx and pioneer amp?

Hi there having real issues with my rmx and vdj. I have a pioneeer home theatre amp and have tried all the different sound settings, and also tried dif inputs, but cant get the setup to not sound "tinny" i have also noticed that if i turn up the amp without any tracks playing i can hear what i can only describe as a radio signal, which when i unplug the rmx intantly goes, please help me if you have any ideas.