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FiiO K7 Balanced Headphone DAC/Amp – Apos Audio
Fiio Classic Compact Desktop Usb Dac And Headphone Amplifier With Usb-C - Zorro Sounds
Amazon.com: FiiO K3 DSD256 | 384K/32Bit USB-C DAC and Headphone Amplifier for Home and Computer(3.5mm Single Ended/2.5mm Balanced/Coaxial and Optical Digital Outs) (K3 Titanium) : Electronics
FiiO K7 review: This outstanding DAC drives headphones, too | TechHive