The problem is that technology was pretty static until the late 90's. Then it took off almost on an exponential basis. This is why I no longer buy the top of the line for anything (electronics..anyway) It's just not worth it as technology changes too fast.

I'm eying the 4520 myself, but may wait until a new version of denon comes out (making the 4520 a bit cheaper)

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Denon 4520, EPIC80/500/VP180 Speakers