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Amazon.com: Fostex HP-A4 24 bit USB and Optical DAC with headphone amplifier. Up to 5.6 Mhz DSD and 192 Khz PCM. : Electronics
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Fostex HP-A4 24-Bit Digital to Analog Converter/Headphone Amplifier Bundle with 3.5mm Stereo Mini Plug To 2 RCA Plugs Audio Cable - Walmart.com
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