There have been a lot of posts on several Mazda forums talking about rattle/vibration/buzzing (call it what you will) coming from one or both front speakers in 2014+ Bose systems, as well as a lot of suggestions about possible causes, but no real solution for some of you. For those of you who hear a "rattling" noise coming from your front Bose speakers, I may have an answer for you. My 2015S GT (with Bose) with <24K miles developed a rattle in the driver's side speaker a few months back. It got progressively worse to where I could hear it with the volume set at just 6. I could also hear the rattle just by rapping on the lower door panel when the sound was off. It sounded a lot like the speakers were blown from music too loud, but I knew that wasn't the case. Not long after that, the right speaker also developed the same rattle. The strange thing was, the rattle sound wasn't always there, and I didn't always hear it from both speakers. The rattle seemed to come and go largely based on the outside or inside cabin temperature, but that wasn't always the case. I checked for loose screws, loose speaker grilles, loose items in the door pockets, but none of them were the problem. No clear cause for the problem. I finally took the car to the good folks at Mazda of West Ridge in Rochester, NY and told them exactly what I was hearing and when I was hearing it. They took the inside front door panels off, examined the speakers, and discovered that part of the diaphragm on the BACK of each speaker had separated from the speaker frame, causing part of the diaphragm to vibrate or "rattle" freely. They showed me where the diaphragm had separated on one speaker and I managed to get a picture so the problem has now been verified and documented. If you look just below the person's thumb on the right in the attached photo you can clearly see the diaphragm separation on the speaker back. They ordered new speakers and replaced both defective ones under warranty at no charge. So far, the rattle is gone. In my case, the problem appears to have been caused by moisture which caused the diaphragm to separate from the frame, not from playing the music too loud. If you're having this same problem and your car is under warranty, I suggest you take it to your dealer and have them check it out.
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