Ohm Walsh Micro Talls: who's actually heard 'em?

Spoke to Matt at Bel Canto today. He says that what's called for is a preamp with an impedance output of between 50 and 100 ohms

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Rebbi, there are a limited number of tube preamps avaiable that will fall in the 50-100 output impedance range but if a Bel Canto rep says it, then its advisable to stick with that. I'd steer clear of preamps with output impedance in the thousands if I were you. The Juicy Music preamps do have variable output impedance that can be swithced to low output impedance.

Rebbe,

YEs, the Peach is the one without phono and apparently lower possible output impedance also, so that would be the Juicy Music one for you to consider.

Tvad,

I know you've heard a lot of combos and have a good handle on the matching impedance issue between amp and pre.

Do you find that the ratio of amp input to pre-amp output impedance is a reliable indicator of performance? If so, what differences do you hear consistently as this varies? Are there thresholds regarding this ration that can be identified that reliably predict actual performance in certain areas?

Thanks for whatever insight you might offer up on this topic.