http://forums.e60.net/index.php?showtopic=61404

http://forums.e60.net/index.php?showtopic=29941

I wanna know how you can tell if you have the logic7 my music sounds insane for a stock system but would like to know which system I have ? Like to see my options

have your dealer or a dealer look up your vehicle via VIN...they can print out a list of all your options...

I believe the option code is 677- premium hi-fi system

Or you can just look in the iDrive under settings, audio, if you have an equalizer and the surround sound settings, you have L7. If not, you have HiFi system.

Or look at the rear doors. Logic7 has one speaker in each rear door for a total of 13.

how can I tell which system I have in an 2004 525i? I have a aux plug and 6 disk changer in the glove box if that makes any difference whatsoever lol

Plug your VIN into a decoder such as this: BMW VIN Decoder - By Mitsuhiko Kanekatsu and it should tell you. Also count your speakers. There are 11 with the Logic7 system.