Polk speaker help

[2003dime]

I have a 2003 S-10 with a JVC KW-V41BT in the dash. I bought some Polk speakers (DB461P for the dash and DB651 for the doors). I've never had this problem before, but they sound like crap. The 6.5's sound OK by themselves, but when I run all 4 everything gets distorted and there's virtually no bass response at all. What am I doing wrong?

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[dubstepper1000]

are you hooking them up to only 2 channels?