Ortofon MC A90 cartridge

This is essentially the classic ten times the internal impedance and it results in the flattest frequency response and thus the most neutral presentation. I also find no diminution of transient response or transparency. I agree that the raising the impedance to a hundred ohms--let alone running it unloaded--can produce some attractive artifacts, but artifacts they remain and most emphatically not accurate. They also become fatiguing after awhile.