sumiko oysterSumiko Oyster MM cartridge with great musicality Sumiko Oyster is an MM cartridge with a very harmonious and musical sound reproduction. Here, you get serious hi fi sound for the money, and a great introduction to what upgrading your cartridge can do for your sound quality. The sound reproduction will feel more three dimensional, with increased depth and a wider frequency range. It is not the worlds most detailed cartridge, but it is capable of