i bought a dodcool dac from china?

 the dodocool dac cost $50 u.s dollars.i have never owned a dac before not sure what a good dac sounds like or if this dac is even doing anything at all? i have included a before/after audio sample running from the dac line out to pc input & live stream recording the audio with izotope rx5 audio editor.please listen to samples & let me know if it's junk.

I say just trust your ears.   In general, any DAC is better than no DAC since without a DAC, you have no digital music!   Whether you want to listen to it long term is a question, however.