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Amazon.com: HELM Audio Bolt DAC/AMP, USB-C Portable High-End DAC/Headphone Amplifier with MQA Playback. Mobile Studio Sound for Android, iOS and PC. USB-C to 3.5mm Audio, THX Certified : Electronics
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iFi Audio xDSD Gryphon Portable DAC Amp Review: This May Be The Last Digital To Analog Converter You Need To Buy! - HIFI Trends
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iFi hip-dac portable DAC/headphone amp review: Sublime sound from a tiny, well-built package | TechHive
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Review: iFi Audio's Hip-Dac Is The First-Class Portable Dac-Amp You've Been Waiting For! - HIFI Trends
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Amazon.com: THX Onyx Portable DAC Headphone Amplifier: High Resolution Audio DAC for Smartphone/PC/Home Audio - THX AAA - MQA Renderer - Direct Stream Digital (DSD) - ES9281PRO DAC - Magnetic Cable Management : Electronics
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Archimago's Musings: REVIEW: iFi GO Bar - Portable DAC / Headphone Amp (Cirrus Logic DAC, Balanced & Unbalanced).
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