My phono stage is a Rega Aria, not exactly top of the line, but at $1500, no slouch either.
Ok, this is your phono stage
70 Ohm, 100 Ohm, 150 Ohm, 400 Ohm
63.5 db and 69.3 db
There are dip switch settings for all Rega MC cartridge models, but what about your MC cartridges, they are all Rega ?