Other than impedances, it is easier for a higher gain input to be overloaded than a lower gain circuit. As such, using something other than a low output cartridge in a high gain MC circuit can produce harder, grainier output on peaks. Better phono stages have very high margins of error though, allowing a very high peak input level prior to driving them into momentary saturation. This is more likely to become a problem on recordings that have a very high / loud average recording level or recordings that have great changes in amplitude. Other than that, the differences in loading from the MM to the MC inputs may provide VERY different tonal and transient presentations, so keep that in mind. Sean
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