so... I wasn’t crazy after all. I smelled that too, it was brief, and went away after a few uses of the stereo. I’m not running full gain on the amp, but close to it. I get some ‘fluttering’ sound on one or 2 songs at full gain, but I’m thinking I’m at 9/10 and it’s good. I can vibrate the mirrors / windows, but as Guy pointed out it’s not going to overwhelm the car next to you. I might could be convinced to do the door speakers with some how to know how ( hint ... Guy ) ... As long as you did full 10gauge wire to the sub, or 8 gauge if you think you might come back on it, you should be fine. I can crank the gain all the way up and retest, maybe tomorrow, luck permitting.