Dear Manitunc: What could define the LOMC cartridge load impedance?, first than all its internal resistance that for the Rua is a low 5ohms and that's could means that the " best " load could be 100 ohms but then the cartridge signal is processed in the phono stage and depending on the PS design you can prefer that 100 ohms load, higher or even lower.
My XV-1s nad my past XV-1 were loaded at 100 ohms and with this load value is the one that gives me an accurate and natural sound with the " best " tonal balance ( top to bottom. ) and dynamics.
I think that you have to test different load values and choose the one that makes the Rua shows at its best. Remember that as you go lower on load impedance the volume/SPL goes down so you have to adjust the volume along each load impedance change.
Of course that the cartridge/tonearm set up/alignment is critical too.
Regards and enjoy the music,
R.
My XV-1s nad my past XV-1 were loaded at 100 ohms and with this load value is the one that gives me an accurate and natural sound with the " best " tonal balance ( top to bottom. ) and dynamics.
I think that you have to test different load values and choose the one that makes the Rua shows at its best. Remember that as you go lower on load impedance the volume/SPL goes down so you have to adjust the volume along each load impedance change.
Of course that the cartridge/tonearm set up/alignment is critical too.
Regards and enjoy the music,
R.