Correct - 4" mid is stock. I have the BimmerTech amp using the tune they supplied for stock setup.
Sound is amazing now - even with just the amp upgrade the stock tweeters were not clear. My wife is super picky when it comes to tweeters routinely trashed the sound - but now with the tweeter upgrade she loves it.
Disabling the center channel also made a huge difference in the sound - plus I didn't want the center channel crummy tweeter muddying up the sound.
Some people say the Infinity's are too bright - but to me they are just clear - and I prefer it that way.
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