I didn’t think about it that way. I’ll have to figure out a good mount first and then find a good place to mount it. Thanks for the advice!Cool. I'm going to try that app. Looks like it's called Decibel X on the Apple App Store. It's also displaying dB across the audible frequency spectrum, which is really useful. If you have your phone mounted where you can watch how sound pressure increases as your speed increases in certain frequency ranges, it would be a good indication on the things that are really contributing to cabin noise pollution. I bet it can reliably identify wind noise, for instance. In my truck, when I hit about 45mph it's as if someone flips a wind noise "on" switch.