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This is a strong deal at US$25. Against the recent used market for this amp, that sits well below the US$61 25th percentile and miles under the US$200 median, so the asking price leaves plenty of room for a low-risk buy.
The appeal here is straightforward: this is a well-liked little headphone amp for clean, no-drama desktop listening, with enough current for many normal dynamic headphones and an easy, straightforward sound that makes it a practical upgrade from weak built-in outputs. At this price, the main thing to confirm is that it powers on cleanly, the volume control is quiet, and the included power supply is correct, because a missing or flaky adapter would matter more than cosmetic wear.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Monolith is the premium audio label of Monoprice, a U.S. consumer-electronics company founded in 2002 in California. The Monolith sub-brand appeared in 2017 and was developed to give Monoprice a more serious hi-fi and home-theater identity, with product development led by Hobie Sechrest. It is not an old-school heritage marque, but a modern house brand built on Monoprice’s direct-to-consumer model.
The range is broad and performance-oriented, including headphone amplifiers, DACs, preamps, power amplifiers, AV processors, subwoofers, loudspeakers, and some accessories. Monolith products are also known for collaborations with audio engineers and for using technologies such as THX AAA amplification and Dirac processing in selected models. The lineup tends to emphasize measured performance and feature density rather than ornate industrial design.
In the market, Monolith sits in the value-focused end of the serious-audio segment: above budget entry-level gear, but usually below traditional high-end brands on price. Its reputation is strongest among buyers who want strong specs, credible engineering, and competitive measurements without paying premium-brand margins. It is best understood as an enthusiast-friendly, price-aggressive contender rather than a boutique or collectible label.
See all Monolith listings on RADAR.
