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This Apos X bundle is a genuine bargain, priced at US$200, which sits well below the 25th percentile of US$245 for comparable listings in our database. With the median market price at US$661 and the 75th percentile at US$1,120, this asking price represents a strong deal that undercuts even the lowest tier of recent asks by over US$45.
The stack pairs the highly regarded Apos Druid R2R DAC, known for its affordable balanced outputs and swappable op-amps, with the Gremlin tube amp that adds warmth to high-impedance headphones. New retail for just the DAC is around US$145–US$160, and the Gremlin is US$120, meaning this US$200 bundle includes the stacker and cables for less than the cost of the individual components alone. This is a clear buying opportunity for enthusiasts seeking a compact, modular R2R-tube stack at an exceptional entry price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Stack Audio, a British hi-fi manufacturer founded in 2013 and based in Devon, emerged from the vision of Theo Stack, who spearheaded its debut product, the Onset network streamer. Drawing on the UK's deep-rooted expertise in audio engineering, the company has since prioritized meticulous design and domestic production, earning international acclaim for products that embody uncompromising build quality and sonic purity.
The brand focuses on source optimization and system enhancement, specializing in vibration isolation and noise reduction solutions rather than traditional amplifiers, speakers, or turntables. Key offerings include the Serene record mat and stabilizer for turntables, AUVA EQ isolators for equipment and speakers, and earlier streamers like the Onset, Serene, and Link. These components employ machined aluminum enclosures, inert materials, and targeted interventions to eliminate jitter, microphony, resonance, and electrical interference, unlocking a system's full musical potential.
Positioned as a niche boutique player in the high-end market, Stack Audio commands respect among discerning audiophiles for its no-compromise engineering and exceptional value. Free from hype, its products deliver transparent, natural sound that elevates existing setups, fostering a growing reputation for innovation in subtle yet transformative upgrades.
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