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A Battery-Powered Class A Headphone Amp | audioXpress
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iFi Audio hip-dac2 Portable USB DAC and headphone amplifier at Crutchfield
Vox amPlug 2 Classic Rock Battery-Powered Guitar Headphone Amp AP2-CR
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STAX SRM-D10 Battery-Powered Headphone Amp & DAC
Rolls HA204p Portable 4-Channel Battery-Operated Headphone
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HeadAmp Pico Portable Headphone Amplifier
PreSonus HP2 Battery Powered Headphone Amplifier | Full Compass Systems
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Teac HA-P50 Portable Headphone Amplifier with USB DAC - Walmart.com
