I think the reason I "sense" that the premium hi fi in the 2013 X3 is crappy is that it sounds like it's missing the lower half of the sound spectrum. I'm not talking subwoofer lows, but rather whatever a bass driver or woofer might put out. So although the sound generally is crisp and clear, it sounds similar to what you might expect out of small portable speakers you might attach to your ipod or your desktop computer.
It doesn't sound bad, it just sounds incomplete. And although you can turn up the bass and lower frequencies via the equalizer, the incomplete portion of the bass spectrum just gets louder, emphasizing the fact that your channeling all those nice watts through small speakers.
I'm curious what someone with testing equipment finds when they analyze the sound in an X3.
It's really too bad they didn't use speakers that could provide a more balanced sound in the lower spectrum, given that an SUV has lots of room under seats or in the rear portion of the car ....I can't imagine it was a space issue, but rather a design issue.