The Red Signature (Platinum) looks very much like the Red Signature.
The similarities however, stop there. The body of the Platinum model is made from aged Rosewood which gives it a darker color tone. The greatest difference though, is inside.
The coils of the Pro IV are made of 6N copper wire, painstakingly clad with a silver jacket. The magnets are made of the proprietary (and very expensive) Platinum alloy which accounts for the higher price.
These powerful rare-earth magnets allow the cartridge to respond aptly to even the most subtle movements in the cantilever/stylus assembly resulting in the reproduction of delicate nuances in the music.
However, output for the Platinum models is lower than the others (0.25mV vs 0.6mV) and a good MC phono-stage is recommended to demonstrate the cartridge’s true capabilities.
Diamond cantilever supplement available for Platinum Series Koetsu cartridges.
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