[taibanl]

What month/year production is your 2011 E90?

[Sunny D]

Originally Posted by kaigoss69

Hey man, I can hear it! Check this out, I ran both files through a spectral analyzer. See that horizontal line at about 9-10khz? It begins a little after half-way in Memo and is there all the way through Memo2. Annoying! I also could not hear it on my Macbook, but heard it on the iPhone!

That is awesome, I'm not crazy! woo hoo! Now... how to fix???

[Sunny D]

Originally Posted by taibanl

What month/year production is your 2011 E90?

4/11

[taibanl]

Originally Posted by ry335

4/11

Please study this attachment and determine if it applies to you. You fall within the date range.

Edit: Disregard...I was thinking 4/10...Sorry

[Sunny D]

Originally Posted by taibanl

Please study this attachment and determine if it applies to you. You fall within the date range.

Edit: Disregard...I was thinking 4/10...Sorry

I appreciate the thought... but not the case. I will have to deal with the crappy stock speakers soon.

[Sunny D]

So I thought I would chime in that I finally found the cause of the problem! Turns out, not radio related at all. The noise only happened on startup, and when in 5th or 6th gear (auto), so I assumed it was electrical. BUT, it is a bad vacuum line for the flap in the exhaust!!! I unplugged the electrical connection for the pump in the trunk, and viola, the noise is GONE! SO HAPPY!!!