This blog here explains in detail the differences between base speakers and hifi and where each speaker is positioned etc. https://www.audiokit.fi/kirjoitus/bmw-i4-base-audio-hifi-676-audio-upgrade
Interesting…
So the HiFi set up does not have any woofers under the front seats as AKX thought. The differences are that the HiFi uses a central dash woofer and has lower impedance in the door speakers.
Which begs the question, does AKX actually have HK in his car??
2024 - BMW i4 Grand Coupe eDrive 35 Sport
2020 - Volvo XC40 T4 Inscription
2017 - Audi Q3 TFSi Sport S-Tronic