If you can afford it, this is the best option and it's Made In America.

http://www.stereophile.com/headphones/centrance_dacport_usb_headphone_amplifier/index.html


Joe
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joesax
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https://music4stressedoutsouls.bandcamp.com/
Tyros 3, Motif XF6, Quad Amp/Pre-Amp/DAC, Quad Monitors, Tascam Digital Recorder