I have the 2023 3 series with HK. There definitely is some bass, just so weak. The amp is fine, I already had service check it, they said a year or two ago some HK amp units needed to be replaced, but mine was fine. The service writer recommended a local car audio installer that they refer, but said a high end upgrade will cost about 4,000, and I don't have that to spend.
He said a lot of M3 owners have replaced the HK components with a French brand called "Focal" and have been very happy and that the same parts will work in any G20.
I think the issue, plain and simple, is that I am a bit spoiled by having heard other systems and how good car audio can truly be. I just took a ride in my neighbor's new Volvo a half an hour ago, he opted for the Bowers & Wilkens upgrade (over the base HK). Wow, the Bowers & Wilkens is also an amazing system - maybe even better than Bang Olufson or McIntosh, and far superior to the HK I have in the 3 series.
However, I am still very happy with my 2023 3 series purchase!
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