I guess he doesn't really specify what it is but my understanding is that dsp is not plug and play but requires some cutting of wires etc. I really want to give the Eonon a go but am a little confused. As for the radio down to 1 speaker occasionally 2 but never sure what your going to get. Everything else is fine TV cd stacker etc all work great. Is the GPS plug and play and are the monitor cars pre wired for it , the GPS drive can be bought cheaply and would be a nice addition if I get the radio repaired.

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BMW E53 3.0d
Full sports pack written off
E70 XDrive 3.0d sports pack