upgrading my amp

[bruce1234]

My system consists of the following which is installed in a chevy van with all componenents right up front in the cab.Fronts speakers are polk mc6500,rearsmc690 powered by a sony xplode 4 channel 600w amp. 12" polk db124 sub w/kenwood kac7252. after adding the sub my system really can rock, but im always trying to improve . Any suggestions for replacing my sony amp .

I heard it was just an entry leval amp. thankyou.a

Also anyone out there have any experience with the polk signature comp speakers.would I notice a big difference over their baby brother.

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