Ortofon Cadenza Black loading

Do a search on the topic of cartridge loading. Several experts here have explained numerous times this is more related to the phono amp capabilities to deal with resonance than to any specific cartridge requirements. The cartridge manufacturer recommendation is a good place to start, but you'll notice that many aren't very specific about loading, usually it's something like '>100 ohms'. You have to figure it out for yourself, so use your ears.

BTW there are a few cartridge designers that give VERY specific loading values for their products, like Lyra and Jan Allaerts. But to be honest I don't understand what these values are based on. 

Yes. I run mine at 100 ohms and this seems perfect.

To some extent it is dependant on the phono stage, but it seems most people run the Cadenza Black at 100 ohms from what I have read over the years.

100 Ohm is standard, basic recommendation for many MC, also default for the most phono stages. But you can use whatever YOU like, can be 300, 500, 1000, 10000, 47000 Ohm.

It’s nice to have a phono stage with optional loading, not every user have an optional loading, normally no choice, except 100 Ohm (or very few alternative options). So when someone using 100 Ohm and ok with that, it doesn’t mean he/she tried many different options.

Do not hesitate to try different loading if you can, it will not make any harm for your MC cartridges.

I really like my Icon phono stage. It is fixed at 100 ohms MC. The designer has gone into the logic behind that in great detail.