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E82 / E88 1 Series (2008 - 2013)
BMWs throw back to the iconic 2002, with a renewed form and function. The smallest car in BMW's line up but still packs a punch. Available in coupe or convertible, powered by either an inline 6 in the 128 or the twin turbo rocket sled 135.

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Old 04-16-2012, 11:02 AM
str8shot str8shot is offline
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Location: Wisco
 
Join Date: Apr 2012
Posts: 1
Mein Auto: 2008 135i
2008 US 135i professional deck replacement - singal to factory amp?

I'm installing an Alpine 9885 in my 135i.

I've already got an ASWC to retain steering wheel controls, powered antenna adapter and a 9003 harness.

My question is - Does anyone know how the signal gets from the factory deck to the factory amp in the trunk?

From what I read it's over copper, and not MOST bus.

BUT - is it a high level amplified "speaker" (deck) output / (amp) input?

Or is it low level (in which case I'll need to solder RCA pigtails onto the harness I bought)?

Help! This is the only thing holding me back from starting my install.
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