Description
I have the cables are wires for my car amp that is 1000w 1 channel, Will those work for my Alpine amp that is only few hundred watt 2channel

Explanation & Answer

They will work. You may have to get new ring terminals because the thousand watt amp would have 4/2 ga. wire, but it will hold the capacity just fine. Also, the RCA cables will work fine, there is no difference in them because they are just signal cables.
