Cost effective HiFi Professional upgrades
I speced my E90 330d LCI with HiFi Professional. In retrospect I should have just plumped for the Harmon Kadon/Logic 7. HiFi Professional which I have is the system with 8 speakers (inc the door tweeters) and an amp in the back. AFAIK it is 180W total power.
What are some cheap (under GBP500/$800) and minimum invasive audio upgrades I can do?
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