I have an original KC Vibe and really like the sound of it. I enjoy both MM and MC cartridges, though, and its noise floor when using MM is higher than my other phono stages. I mostly listen via headphones, so this can be audible over the music, especially when listening to softer music or a record that isn’t cut very hot.
I emailed Ron regarding this and he explained to me that the KC Vibe uses a bipolar input which is designed to have lowest noise when used with a low source impedance, like an MC cartridge. This as opposed to a JFET input, which would have lower noise when used with a higher source impedance, like an MM cartridge.
Are the higher-end Sutherland phono stages like the Insight and 20/20 the same as the KC Vibe in this regard? If so, I’ll probably keep the Vibe only for MC and look for something else to use with MM.