Audio turn on thump

[triplington]

Every second or third time I start the car, after a couple of seconds, the audio turns on and I hear a thump in the speakers. Is this unusual or just a design fault ? I have a 2012 R spec with the 17 speaker Lexicon system. I'm taking the car in for servicing soon, but I don't want to have the dash ripped open with the normal rattles that start after that if all I'm going to get is a new unit with the same problem.

 

[EXBMWGUY]

Every second or third time I start the car, after a couple of seconds, the audio turns on and I hear a thump in the speakers. Is this unusual or just a design fault ? I have a 2012 R spec with the 17 speaker Lexicon system. I'm taking the car in for servicing soon, but I don't want to have the dash ripped open with the normal rattles that start after that if all I'm going to get is a new unit with the same problem.

I have the same car and have never experienced that. I'd take it in.

 

[OneFunGenesis]

That is typically the sign of a dying amplifier. I have had this happen with custom stereos for years. Sometimes the stereo can live it's entire life with an amp thunk

 

[simplicityinsound]

ditto, an issue with the grounding of the oem amp, or some kind of fault thats cuasing internal resistance load issues...

if its under warranty, a simple swap of the amp should fix it.

b