If you mean the turnover frequency, 10 Hz would be too low as that is where the cartridge/arm resonant peak is often centred. Ideally you want nothing at all below 20 Hz, which means in an analogue system you have to start at 30 or so. Here's a good example...
There is no real signal down there anyway <https://www.audiosciencereview.com/forum/index.php?threads/the-courteous-vinyl-playback-discussion.34143/post-2336940>.
Indeed. Normally with a pronounced resonance and distortion we would expect a peak but here we have a deep suck-out. If it was just one side I'd expect to find something loose somewhere but that can't apply here.
Good to see, but it seems odd to omit the manufacturer's name from the title.
I see that this can digitise RIAA phono. Would it be possible to measure that?