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Well since were on the audio part of the IS which w/ 13 speakers sounds great. My mom has the 05' ES330 w/ premium sound system, it has 7 speakers, mark levinson system w/ the lil 8 inch. sub. It sounds great, very clear and crisp, however does not provide the amount of bass I want! However, In my 94' ES I have the nakamichi premium sound system, it was nice but those speakers have been blown out, I have installed nice aftermarket speakers, plus a $150 amp, and my 12 inch sub and it blasts. Its just as clear as the mark levinson system and the bass hits the low tones perfectly and you can feel it throughout the car + around my car :). Im hoping I wont have to add much to the IS system once I get it in May, I think I will get the standard sound system and update it myself w/ cheaper and what I think is better aftermarket speakers/subs. Just my two cents...