Bose uses 2 ohms speakers, MB intends to use 6 ohms speakers so now and then. Normal speakers are usually 4 ohms (at least that is what I noticed the last three weeks).

I have ordered some quality speakers for a R170 SLK at the nearby MB dealer...they ordered stock (6 ohm) speakers for the doors and some additional Bose (2 ohm) speakers to get the real sound. Those MB part-shop guys didn't even know that there is a difference between the impedance of their own speakers!!!

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)