Hello,
I'll be doing the exact same thing in my 2016 F20 with base audio.
I purchased the HK speakers from AliExpress, probably from the same seller as Berseker
2x 4.5" for front doors
2x tweeters
2x 4" for the rear shelf
2x 8" underseat woofers
Got the Alpine window trim from the local BMW dealer (cheaper than on eBay too).
All together it cost about 250€. Waiting on the parts to get in now.
Berseker are the high tones too harsh now with tweeters in?
Been reading from different sources that the base audio EQ has boosted highs to compensate the lack of tweeters.
Have you done any coding?
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