Swap alpine amp with Lear

[txyaloo]

Originally Posted by haydenswitzer

So I did some more research and it appears that you are right. The DSP amp only has 2 channel inputs while the HiFi amp has 4 channel inputs. I'm still not sure why there is a hookup in the car for the DSP amp or why when I hooked up the DSP amp my electronics starting going wonky. Maybe it has something to do with the IBUS connection.

The DSP amp requires a turn on signal over the ibus from the MID or board monitor. Without that signal, you won't get any sound.

The harnesses for these cars were produced "fully optioned". Easier to deal with one harness part during manufacturing than a new harness for all of the different options BMW offered.