Campfire's portable USB headphone amp/DAC proves an interesting listen but you should try before you buy

Campfire Audio Rely headphone DAC on a wooden surface.

Campfire Audio Relay: Two-minute review

Campfire Audio of Portland, Oregon is not, on the face of it, the most likely company to start competing in the portable USB headphone amp/DAC market. After all, this is a company that revels in doing things its own way, and with a product like this, there’s little scope for individualism.