Quote:
Originally Posted by Billfitz
Finding rattles is easy with the right tool, in this case a sine wave generator, which you can download to PCs and as apps for iPad/android. You need to get your device playing through the system via Bluetooth or the auxiliary input, then use the iDrive radio controls to pan to the rear speakers only. Sweep up through the frequencies starting at 100Hz. When you get to a frequency that's causing a sympathetic vibration it should be easy to feel where it's coming from. Testing for what's rattling in response to a sub you'd start at 100Hz and sweep down.
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Great idea! Embarrassing that I didn't think of that already being an electrical engineer
