e90 10 speaker HiFi stereo upgrade
I have a 2010 325i with base stereo (not harman kardon or Hifi) and idrive+hifi professional.
This is not a US spec car.
I believe this means I have 5 speakers (4 midrange/tweeters) and one sub under driver's seat and a built-in 4-ch amp.
I want to upgrade the amp (or add some) and all speakers/subs.
1) Does anyone know if its easy to get a line out?
2) All threads seem to be about upgrading HiFi loudspeaker or H/K surrond sound which are offered in NA cars. any pointers on upgrading this base system?
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