My High Def. Audio device isn't working after using bookshelf unpowered speakers with a 20w amp. Any way to fix?

[Windows 10]

So, I have some fancy shmancy bookshelf speakers to listen to music and movies off my pc. I purchased a 20w Kinter digital amp to power them and plug them into my pc. I used the mp3 port on the amp to plug it into the split ports on my pc for left and right speakers. It was playing sound when I selected HD audio device for a little while but recently it just hasn't been playing sound when I selected HD audio device and the amp is turned on. I've tried reinstalling drivers and all the normal fixes that are suggested but none seem to do the job. I'm starting to think that it's a problem with my

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