Does anyone else noticed a buzzing noise coming from the rear speaker area on driver side area when going over a bump? I can’t tell whether it’s related to the speaker or the electronics next to it.

In less than a year old, there are other noises already.
1. The sunglass case holder’s tab rattles. I taped it with duck tape and used a knife to cut the notch so it will latch.
2. The plastic piece next to the gas pedal foot well vibrates. I jammed a piece of cut foam between the plastic board and the floor carpet.
3. The driver side’s shoulder seat belt harness rattles. If I adjust it to the lowest level, the rattle goes away. The mid and high settings will have a rattle.
4. I still don’t have a solution yet for the rear speaker buzz.

 

See if you can have someone drive with you while you are in the back seat. Go to a place that has speed bumps. Push down where you think the noise is coming from. I've isolated noises this way & use something to decouple both surfaces from each other...closed cell foam works very well. Heck, in the past I've even used pieces of cloth. Since your car is only a year old, why not have the dealership deal with those issues?