5ynatra

Hey guys,

Have any of you experienced a subtle yet noticeable blown-out speaker like vibrating sound coming from the backseat speakers when flooring it in S+? Almost feels as though the speakers are producing the noise.

Can't say it's always been there, just wondering if anyone experienced something similar.

Egghaus

I feel like this just happened to me today, a weird buzzing noise from the back seat area seemingly in tune with the exhaust under hard acceleration. Had the car 3 months and it's the first time I've heard this.

stockbmw

Sound like diff problem. See at what speed those noises are generating.

gpouliniii

I have a JL Audio sub and amp in my trunk and when I switch it to Sport or Sport+, I heard a slight humming noise from the sub. It kinda did it before too, but it’s much more noticeable now, than it was before.

HighSun_Murder

Maybe its not grounded properly? Or the remote cable is running down the same side of the car as the power for the amp? This would cause a whining sound when you hit the gas.

gpouliniii

It’s only in Sport or Sport+ mode. In comfort mode, it doesn’t do it. I’m not sure what it could be.

5ynatra

You guys think this has something to do with the engine sound being mic'd into the cabin? Unsure if this is true or not but it would explain it.

5ynatra

And sure enough it DOES explain it.

After some digging in the forums, the PFL c43 sedans (to my knowledge) DO have an engine sound enhancer/generator located in the trunk fuse box in position 424... I removed it and voila, the vibration at higher rpms is GONE!

The engine still maintains its sound, you can hear the turbos spool a bit better, it's just not as low/loud from inside the cabin anymore, burbles still there, so overall, removing this fuse was a great option for my situation. Keeps it natural

Info can be found here: https://mbworld.org/forums/c450-c43-...ine-noise.html