Hi Folks new to the forum.
Just picked up a 06 E53 3.0 80k with nav, and the audio is horrible. I don't have DSP, but the nav option. I was going to upgrade to the bav sound speakers, and sub, but I looked in the back and can't seem to find a amplifier. I did find some odd open wires, and a yellow top battery. So I guess the former owner had a system of some sort. So my question is did some nav models come without an Amp?