There is always alpha one
https://www.bimmer-tech.net/speakers-and-audio-amplifier-for-bmw?utm_source=youtube&utm_medium=yt_organic&utm_campaign=yt_or_A90_Supra_speakers_install
or
Mobridge amp
https://mobridge.us/product/mobridge-most-amplifier-bmw-audi-mercedes/
I kept the stock JBL...
Well if there was a buyer that wanted the car without seeing it, and you wanted to see it before you pull the trigger on it then there is a chance you would not buy it. The dealer was right to sell it. Hold out for what you want.
I do not have an RTA mic to do the sound correction. I am still running the original speakers so that may be the problem. all the channels are flat EQ but sounds a little harsh as the volume goes up. I was hoping I could adjust it but its tedious work by ear. I may just need to change out the...