Onyx Platinum

About the Onyx Platinum

The Koetsu Onyx Platinum is the first Koetsu cartridge to feature a non-wooden body, machined from a high-quality block of onyx stone selected for its natural grain and polished to a fine finish. It weighs approximately 12.5 grams, making it one of the heaviest cartridges. Internally, it uses tightly matched silver-sheathed copper coils and rare platinum alloy magnets, which significantly enhance performance compared to earlier Onyx models without platinum magnets. The cartridge features a boron cantilever and delivers an output of 0.3 mV. It is hand-made upon order and is highly regarded for its luscious midrange, stunning highs, involving lows, life-size imaging, and wide dynamic range. The Onyx Platinum is also unique for having tapped mounting holes. Recommended tracking force is 1.8-2.0 grams, with a recommended load impedance between 75 and 500 ohms. Frequency response ranges from 20 Hz to 100 kHz, with channel separation of 25 dB at 1 kHz and channel balance within 0.5 dB at 1 kHz. Compliance is 5 x 10^-6 cm/dyne at 100 Hz. This cartridge is considered a pinnacle of analog cartridge design and is hand-built in limited quantities by the Sugano family, continuing the legacy of Koetsu's legendary sound.