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(I know I am bumping this thread from the dead)
All of the stock Z4 audio systems are horrible. If anybody ends up reading this at some point and wants to overhaul their sound experience feel free to message me. I've spent countless hours messing around with various different complete aftermarket systems.
A huge upgrade in sound can be had for not much money once the stock amplifier is sold. These go for around $300-400, and you can essentially buy a far more powerful amplifier, two subs for the rear, 3 way component speakers and a new headunit for nearly the same cost.
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