I'm currently in the process of upgrading speakers and such. I have a 2000 CLK 320. Rear Deck are 6.5" 4 Ohm. Front Tweeters are 8 Ohms. I have yet opened up the door panels yet but will post once I have successfully done so. I have a bose system with fibre optic changer controls. Factory amp is located on the driver side rear trunk quarter panel and is connected by a factory harness from the head unit. (Not easy) I have yet to discover crossover details either. Looks like they may use passive ones on the tweeters. There is something that's covered in the line that is heat shrinked. Please post on your discoveries as well please.
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