[E92x7z]

question about the rear installation :

I replaced the rear speakers with Audison APBMW X4M but when I increase the sound signal I have big distortions and I want to ask if there is a capacitor / filter somewhere in the factory installation or? ....the sound is much cleaner much livelier than the original base speakers but it is much much weaker!

line is a PRO CD with Vibe powerbox 65.4 and HI FI coding

in a front speakers audison APBMW K4E i not have any problems ...

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[ctuna]

What system did you start out with?
Since you said you coded to Hi Fi I would assume
it's either the stereo system or Logic 7 with the stereo
system being more likely.

If you started out with the stero system did you split the
parallel connection between the front door and floors.
Then run and amp channel to each location .
Meaning if you have a 4 channel amp the rears are not unamplified.
(and at a 5 volt pre amp level if hi fi programming was successful)

Since you only have 4 channels how did you allocate which speaker they go to.
The back speaker would have dropped a bunch in volume if you were successful
in coding to Hi Fi and are now is unamplified with a 5 volt pre out signal.

Normaly with Hi Fi coding you get a 6 channel amp if you want to amp all locations.
If you don't you forget about the rear speaker positions.

These third party imaging services generally don't work well here and
are a PINTA in general. Your link is totally useless.

No capacitor as far as I know it's just wiring from the rear channels of the head unit
with the stereo setup.

[E92x7z]

for me problem is a same HU Alpine CD 73 ....
amp Vibe powerbox 65.4 have ISO plug n play harness and RCA outputs ... for another amp

need real better CD ... pionner PRS 80 aprox.

[ctuna]

Whatever you said is not understandable.
You have 4 channel amp. You need at least 6 channels
to deliver a separate channel to each speaker location.

A different head unit without amplification will not solve this problem.

Head units have 4 channels out don't know of any that don't .

CD what are talking about prs 80 is a head unit without amplification I believe.
That still won't fix no amplification on the rear channels.

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/showthread.php?t=138949
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

Look at the diagram for Hi Fi in the above links.