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Discussion Starter · #1 ·
I was looking all over the bmwusa site and the brochure for the specs on the stock head unit.

I know the harmon kardon upgrade bumps the stock unit's power by 40%, but 40% of what?

If anyone knows, I'd appreciate it.
 

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King of Rear Clunks
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31st330i and I figured this out way back when. I think it was somewhere on the order of 10wRMS.

If you're thinking about doing stereo mods, do a search and read all the caveats FIRST.
 

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King of Rear Clunks
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Re: Power of head unit

TGD said:
BMW Reverse has 4x10W RMS.
BMW Business has an 4x20W RMS.
US E46 models don't have power in the head. There's a separate 10ch amp.
 
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