1TallCampbell

Joining the chorus: 2015 Yukon Denali, vibrating and booming so bad that it made my kids car sick. However, I strongly suspect it's resonate frequency and the booming (coming from the active noise cancellation) is an effect; not the problem. For those who may not know, Active Noise Cancellation (ANC) is essentially noise cancelling headphones. Noise is produced as a sine wave. Noise cancelling headphones have microphones built in to measure the wave and outputs the exact opposite wave called "destructive interference". The end result is an absence of sound because the two waves cancel each other out (here's a good visualization). Here's the tricky part: it takes both sound waves (the sound you want the cancel, and the opposing sound put out by the ANC) to get the "silent" destructive interference. And, the truck determines amplitude by the aggregate of all the microphones. So here's what's happening: the microphones are hearing that the passengers don't hear. Since all the microphones are hearing it, the truck thinks its really loud and calls for the maximum cancelling wave. The "booming" is because the passengers are only hearing the cancelling wave from the subwoofer, but not the input wave the microphones are hearing. So the booming is caused by the vibration; the people who have booming but no vibration may just not be feeling the vibration, but the truck absolutely does. Lowering the suspension is partially working because it's introducing a different frequency. It's disrupting the resonate frequency that is resulting in the booming. Unfortunately, there's no quick fix, only mitigation. The weight reduction efforts lead to thinner metal that can't absorb the initial vibration. The truck heavily relies on the ANC to quiet the cabin down...they have an unacceptable amount of road noise without it. The 5.3l 6spd are less pronounced and may be an option, but wasn't for me. For me, the 15th time to the shop was the deal break. I traded the truck towards a Range Rover.