Having had my I5 for a few days now (with the Bose system), I have to completely agree with @benemos - although it doesn't sound bad, it's one of the few things about the car I'm a bit disappointed with.I was certainly expecting more. The sound is just so muddy and flat - I can't seem to bring any life into it. It sounds artificial and overly controlled to the point it loses all detail.
Could that be the loudness of the source that needs some cranking up? (BT, USB)Having spent more time playing around with this last night, I found the Bose system sounds very good when you crank it up to really high volumes (3/4 to max) - it's almost too loud but the detail and 'brightness' I thought was missing at lower volumes is much clearer when you get to anti-social levels! There's hardly any distortion as well. So the Bose system is capable of sounding very good, just not at lower volumes.
It's almost as though it needs a 'Loudness' option like car stereos from 20 years ago which boosted the equalizer to sound better at lower volumes.
I did think that, the volume on my phone via Bluetooth was at maximum (also tried lower volume) but it made no difference.Could that be the loudness of the source that needs some cranking up? (BT, USB)