Magnepan 1.7i vs. 3.6


Has anyone heard 1.7i and 3.6 side by side? I'm considering to change from 1.7i to 3.6.
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I bought the H360 Black friday after listening to the new h190 and if the case of the h190 hadn't gotten warm to the touch I was more than satisfied with the sound and it's $1700 less than the H360. Using my Hegel to drive v1 ultima salons and have no regrets in fact the combo is bringing more out of my recordings than I heard before. 
Consider if you will add a sub or not as that might influence your selection. The Hegel Maggie is a great match. 
Is 3.6 airy and open from sound as 1.7i? Have they any other differense than bass?