RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
New, the ZA3 typically costs around USD 140–200 depending on the power supply, so USD 110 used is a strong deal—well below the supplied used-market 25th percentile of USD 118 and the USD 135 median. It is especially attractive if the 48V supply is included.
The ZA3 earns its reputation with clean, powerful Class-D output, balanced XLR/TRS and RCA inputs, a subwoofer output, 12V trigger, and useful stereo/mono flexibility; it can deliver roughly 180W per channel into 4 ohms in stereo or 235W in mono. At this price, it is a worthwhile compact power amp for demanding bookshelf speakers or a future dual-mono setup. Since condition is unknown, confirm that the correct external power supply is present, the volume control is quiet, and both channels work before buying.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Fosi Audio emerged in January 2017 from a modest 10-square-meter office in Shenzhen, China, founded by Ryan Huang and a partner driven by the conviction that high-fidelity sound should be accessible without elite pricing. The brand represents the new wave of Chinese audio manufacturers challenging the traditionally expensive import-dominated hi-fi market. In less than a decade, the company has grown from a confidential startup to an internationally recognized player, now operating from an R&D center spanning over 2,300 square meters and holding more than 100 patents.
Fosi Audio's product portfolio spans the full spectrum of hi-fi components, with particular strength in compact amplifiers and digital-to-analog converters that deliver disproportionate performance for their price point. The brand manufactures integrated and multi-channel amplifiers, DACs, headphone amplifiers, preamplifiers including phono stages, passive subwoofer modules, speakers, headphones, and cables. This comprehensive range reflects a deliberate strategy to serve both entry-level enthusiasts and experienced audiophiles seeking value-oriented solutions rather than feature-laden complexity.
The brand occupies a distinctly mid-tier, value-conscious position in the market, distributed across more than 150 countries and frequently ranking atop Amazon's hi-fi charts. Fosi's reputation rests on pragmatic engineering—delivering compelling sound quality through efficient, optimized electronics rather than pursuing systematic upscaling. The company sells directly through its website, Amazon, and AliExpress, backing products with lifetime technical support and a 24-month warranty, positioning itself as an accessible gateway into serious hi-fi rather than a luxury or boutique concern.
See all Fosi Audio listings on RADAR.
