[colorado.e9x]

The Logic7 subs under the seats are making {something} rattle behind the side skirts. Has anyone had this problem?

Looking for a fix. Makes my car sound like a shitbox

[Welcome to NBA Jam]

Sometimes, but I can only hear it outside the car.

[JonOhh]

My 06' 330i does it, and so does the M235i in the family. Interested to see what exactly it is, although I'm pretty convinced it's just the undertray vibrating and hitting something.

[marvinstockman]

Jack up car, and look around with the radio on.

[Efthreeoh]

Can't speak to every version of the E9X, but in 2006, the 330i had a slightly higher rated subwoofer system than the base 325i. The 330i subs enclosures extend into the cavity in the rocker panel to create a Helmholtz chamber to extend the bass response. The '06 325i did not have this bass resonator feature. I assume the '07 and up 335i models used the extended subwoofer enclosure as well; but later models did have cost-cutting de-contenting going on, so BMW may have dropped the feature altogether. A realoem search may help determine if your car is so equipped.

Maybe the Helmholtz chamber is rattling.

[colorado.e9x]

Originally Posted by marvinstockman

Jack up car, and look around with the radio on.

On my next oil change I plan on doing that. Pushing up the side skirt and under tray does nothing, time to dig more

[colorado.e9x]

Originally Posted by Efthreeoh

Can't speak to every version of the E9X, but in 2006, the 330i had a slightly higher rated subwoofer system than the base 325i. The 330i subs enclosures extend into the cavity in the rocker panel to create a Helmholtz chamber to extend the bass response. The '06 325i did not have this bass resonator feature. I assume the '07 and up 335i models used the extended subwoofer enclosure as well; but later models did have cost-cutting de-contenting going on, so BMW may have dropped the feature altogether. A realoem search may help determine if your car is so equipped.

Maybe the Helmholtz chamber is rattling.

I'll take a quick search for that and see what I can find. Thanks for the detailed response

[marvinstockman]

You can also download a 50 Hz test file:

https://jlaudio.zendesk.com/hc/en-us...27-Audio-Files

Play it through you radio, and search for the source of the buzz.

[colorado.e9x]

Originally Posted by marvinstockman

You can also download a 50 Hz test file:

https://jlaudio.zendesk.com/hc/en-us...27-Audio-Files

Play it through you radio, and search for the source of the buzz.

I don't know why I didn't think of this.. Genius