I've been trying to get speakers to work for a while now. I got the Amazon Basic speakers, (https://www.amazon.com/AmazonBasics-Powered-Computer-Speakers-A100/dp/B00GHY5F3K?ie=UTF8&keywords=computer%20speakers&qid=1465334147&ref_=sr_1_3&s=pc&sr=1-3) which are active and connect through USB and headphone jack. However, they don't show up anywhere, but are receiving power and lighting up. When I enter "aplay -l" I receive "**** List of PLAYBACK Hardware Devices ****" and nothing below that. It's the same when I plug in my headphones, and I'm not able to adjust the volume. Any suggestions?
Edit: I'm running Raspbian Jessie on a Pi 3 B. I have both the 3.5mm and the USB plugged in, yet they still don't show up. I've tried going through configuration, but the 3.5mm option didn't do anything, and forcing 3.5mm directly didn't change anything either.