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Yeah, BMW seems to skimp on the audio system of its “cheaper” cars. The audio system in the F22/F23 is analog. All more expensive models (3 series and up) get digital systems. My suggestion is start with a budget. The speakers are easy to replace. I upgraded the HK system in my 2018 M240i with Etons up front and JLs in the back. As you’ve read above I changed the factory HK amp with the Audiotec-Fischer 7UP BMW amp because it’s tunable. However, tuning has shown the weaknesses of even the replacement speakers.
The next thing is to get from eBay or an auto recycler the HK tweeter “sails.” These are attached to the door and sit against the A pillars. Your car has 2-way speakers in front and back. The HK system uses component speakers up front. So if you decide to install 2-way component speakers up front you’ll need the HK tweeter sails. The JLs I installed at the back are 2-way speakers-no separate tweeters.
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