We have had this mixer for over 5 years and it is so loud. I can’t hear the TV in the living room while my wife is using this mixer in the kitchen. We had the 4.5 qt before and never had a problem with noise.
When we first bought it, we had ordered it online. We thought it was broken so we went to Costco and bought another but it made the same sound out of the box so we took it back.
I find it strange that no one else has a problem with the noise because it is louder than my power drills and if you have to mix anything for any duration of time, it is literally painful to listen to. I have to leave the room. If you buy a power tool that is this loud, they recommend in the instructions that you wear hearing protection.