[dadysev]

Hi, stupid question. I just bought a 2011 550i and not sure what sound system i have. I like it, and may just add a sub in rear.
It doesn't say anything on the speaker panels, however i can almost see the tweeters through the front door pillar.
What options were there besides the B&O?

[snj1013]

I believe the 550 in 2011 got the Premium system as standard, but you can verify this easily. Premiums systems have a 7 band eq in the Idrive and speakers in the rear doors. Base systems don't have these items.