Low vs. High Output MC Cartridges

A moving inductive coil travels accross the constant magnetic field by Faradey's law and getting a voltage drop between its first and last coil transferred through the pick-up arm wiring harness to your phono preamp...

LOMCs have substantially less coils and certainly less inductance. The cartrige is more likely become a microphone having larger number of coils and sensible to weaker magnetic fields such as EMI. So there's no contradiction there: If cartridge picks up nothing or tolerably insensible to EMI or RFI, than nothing gets amplified X amount of dB or times.

That's why my preference is in LOMC(but not SLOMC though) with high-gain (60dB+) SS phonostage with single gain jFet stage.

Hi - the answer is that the lower output requires less number of coils and due to the lower mass of the moving coils can be quicker than the higher output MC. The downside of the lower output is the requirement for a higher gain phono stage. Some manufacturers produce multiple versions so people can match the output to the gain of their phono stage.

"A moving inductive coil travels accross the constant magnetic field by Faradey's law and getting a voltage drop between its first and last coil transferred through the pick-up arm wiring harness to your phono preamp... LOMCs have substantially less coils and certainly less inductance."

I'm in complete agreement. Then, "LOMCs have substantially less coils and certainly less inductance. The cartrige is more likely become a microphone having larger number of coils and sensible to weaker magnetic fields such as EMI." Here is where I am lost. It would seem to me that EMI fields in the vicinity of a LOMC cartridge would be less likely to induce a spurious signal in the tiny coil than in the larger number of turns of wire in the coil of an HOMC.

Lewm,
I meant for the MM and HOMC cartridges that have higher inductance coils vs. LOMC.
Higher inductance means higher sensitivity to the variable magnetic flux(EMI). Same motions across permanent magnet with larger number of coils will induce larger EMF(Electro Magnetic Force i.e. output voltage) and correspondingly less tolerance to outside signal trash.

Be careful with generalizations. While it is true that a LO version of a particular cartridge is probably "better" (more transparent/detailed) than the it's higher output version, wether it actually sounds that way (overall) IN YOUR SETUP is another matter altogether. As has been pointed out, the ability of your phono preamp to "handle" the lower output version is a complicated matter. First of all, in my experience, phono stages with switchable gain almost always sound better in their LOW gain setting. Same principle as with the cartridge: Less (gain) is more. I have owned phono stages that sounded more detailed with a LOMC, but also sounded lethargic and uninvolving. However, the added gain of a higher output cartridge made it come alive. You gave up a little bit of resolution, but gained a great deal of rhythmic drive. Again, be careful with generalizations and accept the fact that only experience and experimentation in your system, weighed against your preferences, will give you a useful answer. Good luck.