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Amazon.com: Headphone Amplifier Case for Sony PHA1A,Topping NX4 DSD and Creative Sound Blaster E5 High-Resolution USB DAC 600 ohm Headphone Amplifier by WGear, Fastening Elastic Strap, Featured Wrist Strap : Electronics
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Eric's Hi-Fi Blog: Sony's Latest Goodies - NW-ZX2 High-Resolution Walkman, MDR-1ABT Headphones, PHA-1A Headphone DAC/amplifier
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