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Designed for mobile Hi-Fi music enthusiasts, the Sony PHA-1A Portable High-Resolution DAC and Headphone Amplifier uses a Wolfson USB DAC with a separate amplifier section to deliver a broad frequency response of 10 to 100,000 Hz into headphones with an impedance range of 8 to 600 ohm. It supports playback of high resolution audio files up to 192 kHz/24-bit resolution with direct digital connection support for Walkman, Xperia, and iOS mobile devices. It uses high quality components to present a wall-balanced natural 3-dimensional sound stage. The combination DAC and amplifier is optimized for use with the MDR-1A and Walkman A10p mobile devices. The unit comes with two silicone bands for attaching your mobile device to the DAC/AMP as well as a protective sheet.