Koetsu Onyx Platinum
Koetsu’s Onyx Platinum brings authoritative bass, luminous vocal colour and a wide, deep soundstage to a properly matched analogue front end. In Rafe Arnott’s Part Time Audiophile review, it revealed fine musical nuance, clean sibilance and compelling spatial focus, while its platinum-magnet, onyx-bodied design makes every record feel richly grounded and emotionally alive.
WATT RECOMMENDS
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Deliciously Crispy
Sound Quality
93/100
Build Quality
90/100
Features Usability
82/100
Value for Money
87/100
Pros
Delivers authoritative, solid bass with muscular dynamic impact.
Excels with vocals and strings, combining expressive midrange presence with clear fine-detail retrieval.
Creates a wide, deep, precisely organized soundstage with stable instrument placement.
Tracks varied music confidently, handling sibilance without smearing or blurred detail.
Cons
Its low 0.3 mV output and substantial weight demand careful tonearm matching and a quiet, high-gain MC phono stage.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 93/100
In the reviewed Transrotor and SME system, the Onyx Platinum contributed to an unusually solid, authoritative and emotionally involving presentation. The reviewer particularly praised its vocal and string tone, its clarity, and a spacious, precisely organized presentation.
Overall Sound
93/100
The reviewer heard exceptional solidity and muscular authority, with bass described as having absolute authority and a notably substantial foundation. Vocals and stringed instruments benefited from what was called “midrange magic,” while the presentation remained clear enough to reveal fine performance nuances.
Tracking Retrieval
93/100
In the SME arm used for the review, the cartridge negotiated varied LPs accurately and confidently, without strain or apparent loss of composure. Sibilants were handled with ease and without smearing or blurred detail; however, the supplied specifications do not identify the stylus profile, and these results reflect the cartridge's performance in this particular arm and turntable system.
Soundstage Imaging
94/100
The review describes a wide, deep soundstage with generous space around instruments and voices. Instrument images were said to be rock solid, giving the presentation a stable and convincingly layered spatial character.
FEATURES USABILITY PERFORMANCE 82/100
Tonearm compatibility / system fit.
Tonearm Compatibility
82/100
The low 0.3 mV output calls for a suitably quiet, high-gain MC phono stage, while its 12.5 g weight and recommended 1.8-2.0 g tracking force require a properly adjustable arm. It performed seamlessly with the SME TR 5009 in the review, but this is a specialist cartridge whose matching and setup deserve care rather than a casual plug-in installation.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
90/100
The reviewer found the fit and finish of the reviewed components faultless and thoughtfully executed. The Onyx Platinum's onyx body, boron cantilever and silver-plated copper coils suggest an ambitious construction, although the review offers limited cartridge-specific commentary on long-term durability or assembly details.
Value for Money
87/100
At roughly $8,888-$10,995, the Onyx Platinum is firmly a luxury purchase and requires an equally capable supporting system. The reviewer called the complete Transrotor, SME and Koetsu front end a wise investment with few peers at its price, though that endorsement applies to the full combination rather than isolating the cartridge's value against direct rivals.
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Specifications
- Specification
- Onyx Stone Body
- Specification
- Silverplated Copper Coil Wiring
- Specification
- Platinum Magnet
- Specification
- Boron Cantilever
- Specification
- 0.3 mV Output
- Specification
- 12.5 g Net Weight
- Specification
- Recommended Tracking Force 1.8-2.0g
- Specification
- Recommended Load 75-500 ohms
Manufacturer's Description — Koetsu
The pinnacle of cartridge design can be found in a Koetsu stone body. The body is machined from a block of high quality stone. Each block is carefully selected for natural grain and polished to a very fine finish.
Internally, only the most tightly matched silver sheathed copper coils and cores are used. Rare platinum magnets allow the stone body cartridges to fully create the ethereal sound on which Koetsu has earned its reputation.
"The end result is harmonious and cohesive, and the music unfolds in a way that gives you more time to listen – more time to unravel the individual strands that form part of the whole." Hi-Fi+
“… the Koetsu endured in delivering boatloads of color and texture, yet at the same time I’ve never heard a cartridge with greater, clearer pitch certainty on even the lowest bass notes ... All in all, the Koetsu Onyx Platinum communicated color, texture, touch, and musical nuance to an extent and in a combination that I’d never before heard ...”Art DudleyStereophile December 2018Koetsu Onyx Platinum
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- In Living Stereo — in-store — New York City, New York, United States (website)
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- A 10 Audio Room 4 Music — in-store — Amsterdam Nieuw-West, Noord-Holland, Netherlands (website)
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