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New, this amp sat well above the used market, so £178 looks ambitious against a typical GBP asking range centered on £111, with most recent comps clustering between about £95 and £131. It is not absurdly priced, but it sits clearly above the 75th percentile, so I’d treat it as a top-end ask unless the seller can justify it with exceptional condition, extras, or very light use.
That said, the THX AAA 789 is popular for a reason: it’s a clean, powerful, low-noise solid-state amp that pairs well with demanding headphones and tends to disappear sonically. If the unit is genuinely tidy and complete, it’s still a worthwhile buy for someone who wants the performance and reliability of this design, but buyers should push for a better number or at least confirm original packaging, power supply, and any signs of heavy use.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Drop originated as Massdrop in San Francisco in 2012, pioneering a community-driven model that aggregated enthusiast demand to source and develop exclusive products directly from manufacturers. By bypassing traditional retail chains, it built a loyal following of over 7 million members through limited-time "drops" of unique gear, earning acclaim for delivering hard-to-find items at competitive prices. The brand rebranded to Drop in 2019, expanding into its own designs like the Drop SHIFT mechanical keyboard and wireless headphones, often in collaboration with names such as Sennheiser for audiophile-grade audio.
In the hi-fi realm, Drop specialized in headphones, DACs, amplifiers, and cables, alongside mechanical keyboards and gaming peripherals, with audio as a flagship category. Its approach emphasized user feedback to refine products, yielding sought-after collabs like the Massdrop x Sennheiser line, blending accessibility with performance for enthusiasts.
Drop held a niche position as a disruptor in the mid-tier market, appealing to savvy buyers seeking value-driven, community-vetted hi-fi without high-end premiums. Acquired by Corsair in 2023, it shifted toward gaming hardware before shuttering its core operations in March 2025, marking the end of an era for direct-to-consumer audio innovation.
See all Drop listings on RADAR.
