Polk Audio DXi 525 vs JBL GTO528

[Kaiser Pontiac]

So, I have a set of Amazon.com : JBL GTO528 5.25-Inch 2-Way Loudspeaker (pair) : Vehicle Speakers : Car Electronics in my car, but I could get a set of Polk Audio DXi525 5-1/4" 2-way car speakers at Crutchfield.com used for like $10/15 a piece, would that be a worthwhile upgrade, or not really?

http://www.caraudio.com/forums/head-units/622368-kenwood-xxv-01d-questions.html

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[AudioFIN]

Personally, i would keep the JBL's.

Unless you aren't replacing them but adding them into your setup, yeah go ahead.