Well, it’s the cartridges innards, and cantilever's suspension
Ortofon talks about upgrades to Sapphire, then Boron being slightly better than Sapphire
here’s a Boron upgrade
Nude Shibata diamond on a boron cantilever
Stylus
The 2M Black LVB 250 upgrades the great build of the 2M Black with a Nude Shibata diamond on a boron cantilever. The use of an extremely stiff and lightweight Boron cantilever adds remarkable transparency, speed, and responsiveness.
The Nude Shibata stylus’ slim, highly polished profile allows an exceedingly wide contact area to the groove walls and ensures notably detailed reproduction throughout the spectrum, including even the highest frequencies.
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chakster was still around in this discussion of your mc2000