David - The KM620's are great speakers, but need ot be driven well. I'd say that you'll see a noticeable difference between what you have now and the 620's, but with more power will come more reward. The 620's give great mid-bass and a nice warm sound - We use them on mostly all our audio installs here and don't think you can do better for the money... IF you could spend a little more then you'd love the Wetsounds XS650's; they also make for a bomb proof setup.
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