Speaker to Amp questions!

[Deafman]

First thanks for helping if you do! I have an 03 accord with the factory radio, and I am CHEAP, so i wanted to add an amp, which I have, and used the speaker lines to the HI input part of the amp. I am getting a weird noise from the amp. The amp has a dedicated power line from the battery. Its on a common ground from the radio, and as far as I know, its set up correctly. So, my first question is would using an outboard speaker to low level line help? How do i get the purest signal from the radio to the amp and loose the noises?
Any thoughts would be great!
DM

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[audiobaun 5,000+ posts]

Try a different Ground location dedicated for the amplifier only

 

[metalheadjoe 10+ year member]

Does the noise go away if you disconnect the input signal?