Sound Sound System F12/13/06

Hello together, how satisfied are you with the sound of the sound system in your 6s? I have the Harman Kardon system and am only moderately enthusiastic. Has someone changed something about the sound system – with my previous vehicle I had simply changed the door loudspeakers for high-quality variants and achieved significant improvement. Has one of you already done this? There is also a complete system for the 6s from Eton, but is that better than H/K, or does someone have that? And… which sound egg? have you chosen positions with the H/K system? (it always depends on the music you listened to, but it is very different with me) Thank you + LG, Peter