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
Clearaudio states that these tables arrive setup in a foolproof way so that no further adjustment is needed once it leaves the factory. All I personally did was attach the cartridge. Nothing else in my system has this issue, i.e. digital sources. I think I may have to find somebody in NYC that can have a look at it with a professional eye. Or, I simply need to wait until the system has settled through running it in for longer.
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.