xDuoo XD05 BAL2 Portable HiFi Balanced DAC and Headphone Amplifier

95% perfect

Good: More than enough power Bass boost is useful Turbo mode sounds even better Just small enough Play / pause BT button is great Battery bypass Long battery life Microphone! Multiple DAC filters Multiple chips! Continuously variable volume Volume knob impossible to accidentally bump And it sounds great Bad: The three side buttons are exactly where you grab it when changing the volume No digital out to use as a BT-only reciever.