I have a problem in my '05 coupe with bose. The passenger side tweeter makes a buzzing noise sometimes and I've been trying to figure out exactly what's causing it so I can try to reproduce it when I go to the dealer next week. I think I nailed it.

I found that if I adjust the bass output of the system I can make it buzz more or buzz less. The higher I make the bass, the more it buzzes, lowering the bass to 0 or -1, -2, etc...and the buzzing decreases or goes away altogether. The buzzing is worse on songs with heavy use of bass, and for those, I have to push it down to -3 or -4 to stop the buzzing.

I'm wondering if this means the tweeter's crossover is dead and the buzz sound is simply the tweeter trying to produce a low sound, which it isn't made to do...or if the sound is simply b/c the tweeter is 'blown'...or perhaps the signal coming from the amp is being messed up when the bass is increased?

Any ideas from you audio gurus?

 

It could be a shoddy BOSE headunit. I know the 03,04 models had problems with the left channels phazing out, but im surprised its happening on your updated 05 audio system. I would just take it to the dealer.

 

Ive got the exact same problem on my 05 coupe as well. Please let me know what the fix is.