What is the influence of loading on MC cartridge?

"I'm having a Cambridge Audio 640P phono stage modified for me by Arkless and the developer can easily adjust the input stage. My low ouput MC cartridge is recommended to have "from 20 ohms" as its loading. The input stage loading (on my current MF phono stage) is fixed at 100 ohms and until I searched the web, planned to have my new amp set up for 100ohms... But I'm now curious and minded to drop to 25ohms (the sweet spot for my AT-OC9 ?)

What are the (main / noticeable / measureable) effects of increasing / decreasing loading on a MC cartridge ?

Thoughts / advice or even experience, welcome.



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