Essential's PH-1 was criticized at launch for some valid reasons, like a mediocre camera, high price tag, and lack of a headphone jack. But great software and a falling price have earned it a small but impassioned cult following. Now the high-end niche phone from 2017 has a high-end niche audio accessory to go with it: the Audio Adapter HD. But a single-device, $150 external DAC/amp might be a bit too niche.

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