Finding source of sibilance


I've recently put together a few new components. A Clearaudio Concept TT, the Clearaudio MM cartridge, and the Pro-Ject Tube Box DS. Together, I'm not loving the result. The highs sound actively bad and sibilant. Is it possible that I installed the cartridge incorrectly, or is this just not a good setup? I would assume the TT and cartridge themselves are meant to be together. Any help would be amazing!
128x128andbaron
I've never had a sibilance issue that could be traced to cartridge break-in.
It is not clear to me that you know the issue is from the turntable.

Do you have another source which does not exhibit this?

Erik
It could also be the phono stage perhaps? It’s the Pro-Jext Tube Box DS. Digital sources through a streamer > DAC sound good.