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I can't say whether the "medium" level would be good enough, but I can say I left the the HiFi Prof off one car and regretted it. At that time we had the upgrade in our Mini. The Mini sound was full, deep, clear. The BMW w/o upgrade sounded hollow, thin, and weak.
In the last car I did have the upgrade and used it regularly for audiobooks and foreign language news for language study (meaning, clarity was critical as I was struggling to catch everything being said!!). Worked well with that system. Before moving I sold that car and used another, non-BMW for several months. The sound quality was so dramatically different I stopped both the books and the language study in the car. Can't say how that other car would compare to the lower level BMW offerings, but I can say the upgraded BMW worked very well.
Don't know if that helps at all . . .
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