There’s always this stigma that it’s nearly impossible to listen to high-fidelity audio straight from your smartphone. You could have a nice pair of IEMs or wireless headphones. However, some may say you’re still not getting the whole picture, and particular phone manufacturers are making it harder and harder to make simple things like headphone jacks available. There have always been alternatives, portable DACs, amplifiers, etc. However, they still portray the notion of a niche product only really meant for the nerdiest audio geeks.
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https://majorhifi.com/ultrasone-panther-portable-headphone-dac-review/