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Woo Audio WA22 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. Give me more power over a pre any day. This will run pretty much any set of headphones. It has driven my Audeze and Hifiman headphones superbly, albeit they're incredibly different animals. It's from Woo so you know it's quality, built in the USA (11 kgs!). This comes with two full sets of tubes - the stock ones that came with the unit and also the ones I've
At A$1,999, this sits basically at the old new-price level for the WA22, which launched around A$2,500–A$3,150 depending on era/spec and dealer pricing; as a used buy, that makes it fair-to-strong rather than cheap. Comparable used listings I found cluster around roughly A$2,100–A$4,200 once converted from recent overseas asking prices, so A$1,999 is comfortably on the attractive side if the unit is the current 2nd gen and complete.
The WA22 is well regarded because it’s a fully balanced, transformer-coupled all-tube amp with plenty of drive, a wide 8 Hz–50 kHz response, and a sound many listeners prize for scale, separation, and that big, smooth tube presentation. For the right headphones—especially balanced dynamic or planar setups—it’s a serious endgame-style piece, and the weighty chassis plus original tubes/accessories can add real value. At this price, I’d mainly verify the exact generation, tube complement, and that balanced outputs, power switch, and volume pot are clean and quiet.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
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.
See all Hifiman listings on RADAR.
