I got an 07 E85 Z4 last month, and it has the HiFi Premium Sound DSP w/Navigation.
My friends told me about Tune2Air and I have it for my Z4.
It works very well for $90. When I first got it, I noticed the sound was low.
Later I discovered the sound volume on the is directly related to cars volume (stupid me).
I had an installer here in Orlando quote me a complete new sound system, and they hit me $4,388.
The car has a fiber optic cable in it, so you just can't replace parts it's either stock or a complete new system.
I just turn it up and drive with the top down, that's way too much money for a sound system.
Currently I am thinking of buying all of the components and finding an installer or just leave it alone and play with the settings.
If yours has DSP use the Jazz Club mode.
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