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Originally Posted by TJJ
Head unit output to the DSP amp has always been fixed level. But if you remove the DSP, and disconnect battery for a few minutes, the HU goes to regular mode where output is variable so adding amplifiers is easy. You will lose EQ and echo effects but bass, treble, fader and balance will work, now the head unit controls and adjusts them.
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The 2005 X5 4.8is I worked on had only L and R outputs to the amp.
There is no way that the HU fader could possibly work on a two-channel system. Nothing to fade.
I have seen other cars where unplugging the OEM amp caused the output to change from fixed to constant. I'm not too excited about disconnecting the battery to test this suggestion, though.
What year and model are you describing?