The Kohaku is a moving-coil phono cartridge from Ikeda Sound Lab, built with a platinum-coated body and silver wire coils. Ikeda Sound Lab operates at the specialist, enthusiast end of the cartridge market, where exotic body materials and hand-wound coils are common differentiators between otherwise similarly specified moving-coil designs.
Key specs that matter
The cantilever is diamond, a premium material choice offering exceptional stiffness and low mass, both important for accurate high-frequency tracking. Output voltage is 0.5 mV, a low figure typical of a moving-coil design needing a high-gain phono stage, well below what a moving-magnet phono input alone could adequately amplify. Internal impedance is 4 ohms, a low figure typical of low-output moving-coil designs. Weight is 12.5 g, a moderate mass that should suit tonearms across a fairly wide effective-mass range without an unusual compliance mismatch.
Sound and use context
As a cartridge rather than an amplifier, its contribution is purely in how it traces the groove and converts motion to signal - the platinum body and diamond cantilever point to a design focused on rigidity and minimal unwanted resonance, qualities generally associated with a clean, well-controlled transient response rather than a deliberately warm or soft voicing.
Pairing
The 0.5 mV output and 4 ohm internal impedance need a phono stage with high MC gain or a step-up transformer matched to a low-impedance cartridge, so compatibility with the existing phono stage should be confirmed before purchase.
Alternatives
Other high-end moving-coil cartridges in this class typically share a similarly low output voltage and diamond cantilever construction, with the main differentiators between competing designs usually coming down to body material choice and the specific coil winding technique each manufacturer favours. Given the specialist, boutique nature of Ikeda Sound Lab's cartridge range, prospective buyers should confirm compatibility with their specific tonearm's effective mass before committing, since a mismatch between cartridge compliance and arm mass can produce audible resonance problems regardless of how well-executed the cartridge itself is. The platinum coating and silver wire coils both point toward a design prioritising minimal parasitic resonance and maximal signal transfer efficiency, consistent with the broader philosophy many specialist Japanese cartridge makers bring to this category.