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FiiO Q5s -Flagship Bluetooth DAC & AMP, Dual AK4493 DAC chips, Amplifier Module AM3E with 2.5/3.5/4.4mm Output, USB/Bluetooth/SPDIF/Line Input | Headphone Reviews and Discussion - Head-Fi.org
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Amazon.com: EarStudio ES100 MK2-24bit Portable High-Resolution Bluetooth Receiver/USB DAC/Headphone Amp with LDAC, aptX HD, aptX, AAC (3.5mm Unbalanced & 2.5mm Balanced Output) : Electronics
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