Should an installation experience more noise if the RCA cables leading from the Rio to the Amp are disconnected at the head unit. In my installation noise is reduced when i reconnect the RCA's back into the Rio line output than if i were to leave them disconnected. Which tells me that noise that is introduced via either the cable or the amp is being 'grounded out' when the cables are connected to the Rio...

any thoughts on this?

Thanks

Ed