Don't ask me to explain the technical side of it (I'm only spewing out what I've read about current mode phono preamps as I own the Aqvox), but current mode phono preamplifiers like the Nibiru, Aqvox and Dynavector in phono enhancer mode use a type of "automatic" (perhaps not the best choice of words) short circuit loading by sensing the amount of current the cartridge outputs.
Resistive loading in these types of phono preamps when used with moving coil cartridges becomes a non-issue as the "short circuit" means the cartridge is inherently damped. In theory, I think these types of phono preamps offer particularly good performance with low output moving coils that also have a very low internal impedance (I use the Aqvox with a Denon 103R with a 14 ohm impedance) mainly because many phono preamps will not allow you to load down into the 20-50 ohm range which may be an ideal setting for a very low impedance cartridge.
My guess is that the Nibiru will work like a charm with a MC with a low internal impedance of 16 ohms. The lower the better probably with that phono stage.
Resistive loading in these types of phono preamps when used with moving coil cartridges becomes a non-issue as the "short circuit" means the cartridge is inherently damped. In theory, I think these types of phono preamps offer particularly good performance with low output moving coils that also have a very low internal impedance (I use the Aqvox with a Denon 103R with a 14 ohm impedance) mainly because many phono preamps will not allow you to load down into the 20-50 ohm range which may be an ideal setting for a very low impedance cartridge.
My guess is that the Nibiru will work like a charm with a MC with a low internal impedance of 16 ohms. The lower the better probably with that phono stage.