Everyone says that MC is better than MM, but .......
I have been pondering the same thing for a while (no, do not get popcorn out - hate the stuff personally - but unbiased thinking would help).
While having to upgrade a phono stage for a friend (and with a few further requests). I decided to consult on the internet regarding the reigning state of the art of phono cartridges. I am still hunting for inherent MC superiority. Firstly before going there, one must realise that reproduction from records are governed to a far greater extent by tracking and tracing errors, stylus shape and angle - the whole setup - than by actual signal generation by whatever method (provided the latter is of good quality naturally). This already makes one skeptical of dramatic differences (aren' they always) reported between pickup topologies.
Looking at the basic magnetic pickup, the essential elements are a constant magnetic path, a means to vary the intensity of said path corresponding to the traced signal, and a means (usually a coil) to convert said variations to electricity. In the Moving Magnet way - (
here I must pause and point out a misnomer. I have only ever found one system where there were literally moving pieces of magnets on a stylus shank. Most modern so-called MM systems actually seem to be variable reluctance, where the magnet is fixed and the variation in field is caused by a shank carrying the stylus completing the magnetic path between suitable poles.)
For such an MM (VR) system one then has the channel coils fixed somewhere in the magnetic path, with a variable magnetic flux provided through them by a magnetically conductive path with a variable air gap - that of the stylus shank between suitable shaped poles. (This all quite minute in shape.)
In the moving coil (MC) topology, four tiny coils are mounted (usually on a cross) on the stylus shank, there being no fixed coils on the magnet construction proper. Question: In simplest form and all things being equal: Why mount the coils on the moving system, adding mass there instead of having them fixed and keeping moving mass as low as possible? That apart from having to connect the moving coils to the outside world via leads subject to fatigue etc.? Electrically there is no difference: A fixed magnetic path consisting in part of iron and in part of air, and passing though a coil - or did I miss a first year varsity class somewhere? Also, what little data I found on equivalent moving mass certainly did not point to universal MC superiority - the opposite in certain cases.
So, I am asking for elucidation - why the almost snob vaue attached to MC? (I have not even mentioned the added amplification required to get signals on par, with the added danger of added noise.)
(And I would repeat that just about any tonal preference/shortcoming regarding phono cartridges is so dependant on electrical loading in comparison to the principle of MC/MM that the latter is irrelevant.)