This is great work. I am not an audio expert, and my demands are low, but I'd like to improve the audio in my i3 for the back passengers.
My idea are simple 4ohm 30w speakers like:
https://www.amazon.de/Uxsiya-tragbares- ... B08N427TM4
and put these simply under the back seats, left and right, near to the floor. Essentially behind the feet of the rear passengers.
I recognize that there they are not ideally positioned for sound, but their obscure position makes it also less crucial that the speaker integration looks as awesome as the i3 interior.
Nor are these speakers high quality; but they are small, black and easily attachable on top of anything that one can punch a hole in; and that is certainly true for the softish cloth material there.
Is this a bad idea for some reason?
The picture of your speakers in the head unit you posted is awesome, but it is not completely visible for me in which contact you exactly put the wires (in parallel with front speakers). Could you clarify?
Thanks so much for any response!! Once again, this seems a simple way to fix the complete lack of audio in the back..