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I am convinced all (maybe except PDC because its rear only?) would be louder if you used the LOW level input on your amp (gotta crack it open and change jumpers). You would then have a lower volume knob position when listening to audio, so they would be more in balance.
Looking at 3x sets of instructions for the alpine upgrade, it seems BMW can't make up their mind about recoding it or not. The most recent ones (and the oldest ones) apparently say NOT to recode (which is a crap method)...probably because the amps are coming pre-configured for high-level inputs.
The one set of instructions that DOES say to recode is from 09ish...and this is the way to go...but it may require you changing the jumpers INSIDE the amp.
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