Not familiar with the Montana speakers, so can only comment on many auditions of the Mac 2275. Love it, first the sound too the features and the build. First rate in every way. The MA2275 was first on my list, decided to go with the MA6600, only on the off chance I may had to have replaced the tubes within five years. Two kids in their college years, keeps all spending on toys to a minumum. The MAC makes sweet music. Let us know which way you go. Glen
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