"Sorry if that came off as snotty. It's hard to know peoples' tone of voice on the internet. I'm generally a pretty happy person. haha. So if I used a flashdrive with 320kbps files, would it sound better than my phone playing 320kbps files?"
Measure something known with that DMM, like a 9V battery, just to see if it works.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
Sub Stage: Boston G3 10", 0.5 cu ft sealed
Amp: PPI Phantom 900.4
Rear Fill: Boston SE953 6X9's