I'm shure that ACE will do excellent with 47K load and 100Ohm load as well with almost no difference. Your numerous experiments most likely bring you nothing(I've tried that with Glider and with M.09). I've been soldering in parallel different resistors one at a time so I get desirable impedance value, listen for few days or so and heard only smallish changes which I cannot describe as an improvement of sound since something was getting better and something compromised. Finally I've realised that leaving standard 47K load on your phono is OK with almost all Benz cartridges(which is realy good for any phono preamps!)
Usually if the cartridge isn't loaded properly, some of the freequencies(especially bass) might be appear too dim and unresolved. So there is no general rule of thumb rather relaying on your own ear.
And finally friendly advise:
Do not waste your time -- You're OK with 47K!
Usually if the cartridge isn't loaded properly, some of the freequencies(especially bass) might be appear too dim and unresolved. So there is no general rule of thumb rather relaying on your own ear.
And finally friendly advise:
Do not waste your time -- You're OK with 47K!