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COS H1 Headphone Amplifier (with DAC) https://6moons.com/audioreviews2/cos2/1.html This H1 is a 6Moons Blue Moon award winner. Please note from the image of the back panel—the Coxial digital input is BNC and not RCA. I have all the original packaging and materials. Condition: As New / Mint Payment Method: EFT, cash on pickup Region/State: (NSW) New South Wales/Australia By Audiowolf 0 Comments Secure Ad AUD $2,500 Date: October 24, 2025Oct 24
The COS H1 is a respected Taiwanese all-in-one DAC/headphone amp known for its elegant resistor-ladder volume control and high-voltage balanced output, but A$2,500 is an ambitious asking price for a used unit. Its original retail was €2,500 (excl. VAT), which converts to roughly A$4,200–A$4,400 at launch; even with depreciation, typical used listings in AUD usually fall between A$2,000 and A$2,300 for like-new condition, placing this ask near or slightly above the 75th percentile.
That doesn’t mean it’s a bad buy—the H1 delivers clean, dynamic sound with excellent headroom for demanding headphones and remains a rare find in the used market, especially from an original owner. If the listing truly reflects pristine condition with all cables and original packaging, it’s a solid opportunity for someone who values COS’s refined engineering and wants a compact, high-performance solution without paying new retail. Just confirm the DAC inputs and balanced output are fully functional before committing.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
COS Engineering is a Taiwanese hi-fi brand that appears to have debuted in 2014, founded by a small team of audio enthusiasts; some dealer copy also describes the company as being started by three close friends, though that detail is less consistently documented. The brand is often referred to simply as COS, short for Continuity of Sound.
Its focus is squarely on digital and amplification hardware rather than a broad full-line catalog. COS is best known for DACs, DAC/preamps, preamplifiers, headphone amplifiers, and networked or streaming-capable components such as the D10, D1, H10, and S10.
In market terms, COS sits in the high-end niche rather than the mainstream mid-tier. The company’s products are positioned as carefully engineered, compact, and feature-rich components for serious systems, with an emphasis on transparency, low-noise design, and premium build quality. It is not a mass-market name, and among hi-fi buyers it is better known to enthusiasts seeking boutique digital separates than to collectors of vintage gear.
See all COS listings on RADAR.
