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I picked up a near new M340I last month and when I tested my sounds system out there was zero base, all I could really hear sound from the tweeters (Im no audio engineer but that what it sounded like to me). Had to hand the car back right there and they ran. A few days later a new amplifier was installed.
I picked the car for the second time, tested out the sound system and guess what, no bass once again!
Now around 3 weeks of waiting and there is a "booster part" on order to be installed next. I had no issues with my 2018 340, that one was assembled in Germany though maybe they take more care in Europe than this side of the pond.
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