pro 80's?

I finally had time to hook up my pro 80's I am running them on a 5 channel amp bridged on channels 1,2 and 3,4 220x2 at 4ohms the speakers are really loud the only issue I have is I am getting a constant noise from them. when the stereo is paused. I think it is from my amp because I had to use y adapters so my gains are set at 1v almost all the way up on the amp. (the head unit is a clarion with 2v output. I have read on other post about getting a ws 420 to up the volts out so I can turn my gains down is this more than likely my problem? any info would be great thanks