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Woo Audio WA22 (Gen 1) Headphone Amplifier Hi, I'm the original owner of this Woo Audio WA22 Class A push pull fully balanced headphone amp. This is a Gen1 version which doesn't have the preamplifier output on the back, but is more powerful. This will run pretty much any set of headphones. It has driven my Audeze and Hifiman headphones superbly and with ease, albeit they're incredibly different animals. This is a quality built Made in the USA item (11 kgs!). All tubes are upgraded and NOS. I purchased the amp about 10 years ago. Usage for the first two years was about once or twice pe
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Hifiman traces its origins to 2005, when Dr. Fang Bian, a chemist with a lifelong passion for audio electronics, founded Head-Direct in the United States as an online retailer and headphone developer. By 2007, he rebranded to Hifiman, relocating manufacturing and R&D to Tianjin, China, while maintaining sales operations in the US and beyond. This fusion of American entrepreneurial drive and Chinese production expertise propelled the brand from modest in-ear monitors to global prominence.
The company specializes in high-end headphones, particularly planar-magnetic and electrostatic models renowned for their detail and soundstage, alongside complementary portable digital audio players, headphone amplifiers, and cables. Early milestones like the 2009 HM-801—the first pocket-sized high-resolution player—and the HE-5 planar headphones established its innovative edge, with co-founder Binwu He pioneering planar technology integration.
Hifiman commands a elite position in the audiophile market as a high-end leader, delivering reference-grade performance that rivals legacy brands. Its products earn consistent acclaim for transparency and musicality, appealing to discerning buyers seeking uncompromising planar transduction without vintage pretensions or mid-tier compromises.
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