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the mark levinson is worth the price of upgrade. very clear sound, even when turned up. don't expect earth-shaking bass, but do expect a high level of sound quality in all ranges.
however, if you want full functionality of the mark levinson system (i.e. DVD video playback w/ 5.1 surround), you will need to match it w/ the nav.
The clarity is so much better than unneccessary loud *** bass. dont get me wrong there definetly is a nice thump to the system. lets just say once the ML + navi combo spoils you, and you jump into a standard stereo Lexus, you dont even want to turn on the system its so weak imo definetly worth the $$$