I have my doubts that the RCA's are at fault........
If the noise is present when the RCA's are in car and out of car- the noise is comming from somewhere else. How about looking into the path the remote wire follows, is it basically free of any of the cars on board wiring? Next, try backing off the amplifier gains and see if the noise is still present. There are a whole slew of things it could be. Daytona's are kinda funny with stereo's. They sometimes take the common rules of car audio and throw them for a little twist- so some of the standard rules may not even apply. My old Daytona was this way, as were all the Daytona's/Lasers that I have installed in. Very interesting.....
Worse comes to worse and the noise doesnt stop after trying those 2 things. Go ahead and replace the RCA cable and see what happens. Likely, nothing- but hey- //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
Last resort- re-locate the remote wire going back to your amplifiers so that it is positioned directly next to you main power wire going back to the amps.- This is where the normal rules do not apply. My Daytona was not quiet until I did this last idea, crazy enough- it worked too and there was never a noise problem again.
see what happens....
take it easy,
-zane