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Is this US$119 xDuoo MT-604 a genuine bargain or a red flag? It is a strong deal, landing well below the 25th percentile of US$146 and far under the median of US$172 from your recent comparable listings. At US$119, you are paying roughly 30% less than the typical used market anchor, making this an excellent price for a well-regarded hybrid tube amp.
The MT-604 earns praise for delivering a fully balanced, Class-A tube experience with a warm tonal balance and holographic soundstage for under US$200 originally. It pushes 2W into 32Ω, effortlessly driving most headphones from low-impedance IEMs to high-impedance over-ears. Since the price is this low, treat it as a buying opportunity; only verify the tubes are intact and the unit powers on cleanly, as those are the only material checks needed for a clean listing at this price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
xDuoo is a Shenzhen, China-based audio brand that emerged from the country’s fast-growing hi-fi manufacturing ecosystem. Its exact founding year is not consistently stated in the sources available here, and no founder is prominently verified, but the company is widely presented as Shenzhen xDuoo Technology Co., Ltd., with roots in OEM/ODM production before building its own consumer-facing identity.
The brand is best known for headphone amplifiers, DAC/amp combos, portable DACs, tube hybrids, and other desktop-and-portable electronics aimed at personal audio enthusiasts. xDuoo’s lineup has included tube headphone amps, balanced amplifier designs, digital-to-analog converters, and all-in-one sources, typically positioned for headphones rather than loudspeakers or turntables.
In the market, xDuoo sits in the value-to-mid-tier audiophile segment, with a reputation for offering ambitious feature sets, lots of connectivity, and occasional tube-flavored designs at relatively accessible prices. It is not generally considered a luxury or vintage-collector brand, but rather a practical, performance-driven Chinese hi-fi maker with a strong presence among enthusiasts seeking high features per dollar.
See all xDuoo listings on RADAR.
