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Amazon.com: iFi Nano iDSD Black Label Portable USB DAC and Headphone Amplifier - Upgrade Smartphones/Digital Audio Players/Tablets/Laptops : Electronics
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Amazon.com: Apogee GROOVE - Portable USB Headphone Amp and DAC, Bus Powered for Mac and PC, Made in USA : Apogee: Electronics
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Amazon.com: Syba USB 24 Bit 96 KHz DAC Digital to Analog Headphone Amplifier 2 Stage EQ Digital / Coaxial Output and RCA Output SD-DAC63057 : Electronics
Amazon.com: PROZOR 192KHz Digital to Analog Audio Converter DAC Digital SPDIF Optical to Analog L/R RCA Converter Toslink Optical to 3.5mm Jack Adapter for PS3 HD DVD PS4 Amp Apple TV Home