[casse]

I have a 2011 BMW 335i. It has the premium audio system with logic. The guy I bought it from (in January) said he “upgraded” the subwoofers under the front seats. They were working fine for the first few months but had a weird popping noise when the volume is turned up loud. A couple days ago the subwoofers stopped working all together, no sound or bass comes out. What could be the problem? Blown subs or cooked amp? All the other speakers work in the car fyi. VidMate

[ctuna]

First thing is do you really have a Logic 7 system ?
Check with Mdecoder.com
Always check the amp area for water intrusion if you
have a BMW with and amp as a first step.

The premium system was option 676 this is not
the same as Logic 7 which would be 688 in a 2011 and onward.
At least that's the way it is in the US

BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586
http://www.e90post.com/forums/attach...2&d=1266451970
http://www.e90post.com/forums/attach...2&d=1260829447
http://www.e90post.com/forums/attach...1&d=1209780865
http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/
http://technicpnp.com/menuDiagrams/d...e90_92_93.html
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attach...3&d=1169133185
http://www.e90post.com/forums/attach...1&d=1209780605
http://www.e90post.com/forums/showthread.php?t=641323
http://www.e90post.com/forums/attach...4&d=1278871872
http://www.e90post.com/forums/showthread.php?t=343673
https://www.bimmerfest.com/threads/e...n-752.1275694/

base system wiring pre/post 3/09
https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_
Base System Guide
http://www.e90post.com/forums/attach...5&d=1493273253

There is a stereo sub forum here.