Mystery Z4 speaker crackling

[Johnny U]

Hello All. I am a new member and have owned a 2014 2.0ltr M for 3 years now. Absolutely love the machine, particularly as I have had virtually 3 1/2 years trouble free and enjoyable motoring.
For about 6 months now though, I am experiencing a crackling sound from the speakers (with radio on and off) when the brakes are applied and more recently when the clutch is depressed (not so frequent though). Fortunately, when driving without any gear changing or braking there is no incidence of the crackle. It's really strange!
Any ideas before I go to the garage for what will probably be an expensive exploration into what is causing this?
Much obliged - Johnny U

 

[B21]

Your car is fitted with Active Sound Design (ASD)..

This is a DSP/amp that injects fake engine /exhaust noises into the speakers, whether the radio is turned on or off.

It sound like (pun) that you have a loose connection on a speaker (if it comes from one speaker) or if it comes from several speakers a poor connection somewhere near the ASD or maybe the amp..

Which audio system do you have?

 

[Johnny U]

Not sure which audio system - I'll check. thanks for the quick response and suggested cause.

 

[Argyll Andy]

Firstly, hello and welcome

Completely stab in the dark here but I had something similar and it was a plug in usb Bluetooth adapter. It was actually the cigarette lighter accessory that the adapter was plugged into which was causing the interference. Changed it for a big brand one and had no further issues for the remaining time I had the car. Hope you get it sorted.

 

[Johnny U]

Thanks B21. the audio system is the BMW professional.
The crackling comes from more than one speaker, so I guess, as you suggest, its an amp problem or something amiss with the ASD. Hopefully I can find somewhere, other than BMW, to get this fixed. No doubt they would charge a small fortune to investigate and repair.

Many thanks once again for your guidance - Johnny U

 

[Johnny U]

Thanks Andy. I don't use a cigarette lighter accessory in the car, but thanks for the tip anyway. Interestingly, we had an issue using a cigarette lighter accessory on our motorhome, probably a cheapy, but which we don't use any more.

 

[B21]

Thanks B21. the audio system is the BMW professional.
The crackling comes from more than one speaker, so I guess, as you suggest, its an amp problem or something amiss with the ASD. Hopefully I can find somewhere, other than BMW, to get this fixed. No doubt they would charge a small fortune to investigate and repair.

Many thanks once again for your guidance - Johnny U

Corrosion in a connector is my best guess..takes a bit of fiddling to get to the connectors unfortunately….

 

[Johnny U]

Sounds like a distinct possibility. Many thanks

 

[TamTam]

My 2005 Z4 Car speakers started cracking while driving then sound stopped all together although radio was still on. Got home turned the car off speakers are still cracking like crazy. I don't know what to do. I did find water in the battery compartment and soaked it up with paper towels. I have a fan blowing into the trunk now. Should I unhook the battery? I'm afraid because of the water that was there something might be shorted and cause a fire.