[mweisdorfer]

Originally Posted by ctuna

No active systems made by BMW.
No real crossovers between the tweeters and 4inch doors either.
They basicly have and inline capacitor for a crossover.
If you want active you have to run another set of speaker wires.
Maybe the B and O never discussed here but not even the Individual
system has active.

Active means separate channels for each speaker even the tweeters.
Who invented this semi active term I seem to see now.
Diamond Speakers was the first I saw using it.
If you say the underseats are on a seperate channel well OK
but it kind of muddys the waters

BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586
http://www.e90post.com/forums/attach...8;d=1266451970
http://www.e90post.com/forums/attach...8;d=1260829447
http://www.e90post.com/forums/showthread.php?t=343673
http://www.e90post.com/forums/showthread.php?t=138949
http://www.e90post.com/forums/attach...8;d=1209780605
http://www.e90post.com/forums/attach...8;d=1209780865
http://www.e90post.com/forums/showthread.php?t=641323
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...8;d=1169133185
http://www.e90post.com/forums/attach...8;d=1278871872

Ok. My mistake. It does sound like I need to get them if I want to run BMW IA door mids, which I do. I'll probably need to get at least a four channel amp too, is my guess. The MS 8 doesn't have a whole lot of power. I would be happy with 60-75watts a channel. It's a small car; probably 50watts a Channel would work to be honest.