I've never owned the 20.7, but my experience comparing the 3.5R to 3.7i might be of interest. I found the 3.7i to be a significant step forward from the 3.5R, with notable improvements in driver integration, smoother frequency response, better midrange presence and bass response. I can only imagine how much better the 20.7 would be. Of course as a Magnepan owner you probably realize how much they thrive on quality power, so assuming you have a well matched power amp I can't imagine you wouldn't be thrilled with the upgrade.
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