Magneplanar Listening Comparison 1.7 vs. 3.7 Speakers

I have compared the 1.7, the 1.7i and the 3.7 and the 3.7i before purchase. I really believe that both, 1 and 3 series the I-s are better. In fact I almost did not like the 1.7 and the largest difference I found was between the 1.7 and the 1.7i. The 3.7i was all around the best sounding speaker particularly for bass. Soundstage was not a huge difference but perhaps noticeable. Clarity and detail was much the same in all of them. I have a room that is 14 x 19 and it has vaulted ceilings to 16 feet high. I purchased the 1.7i thinking that it still leaves enough space in the room to walk around them and if I wanted more bass I could perhaps add the DWM panels. in the end I found the 1.7 i delivers tons of clean tight bass and I cannot say how happy I am with the setup i own now. No matter how tired I am at night I still have difficulty leaving it all behind and go to bed. It is that nice. 

I'm considering to change from 1.7i to used 3.6. Has somebody heard them side by side or have owned both?

One advantage of the 3.6 is that it can be bi-amped. It has that advantage over the 3.7 as well. None of the .7 Maggies can be bi-amped, as their crossovers are series, not parallel.

Amp will be integrated Hegel H360.

I talked to magnepan about the difference between the 3.7 and the 3.7i and he said
”If you really strain you might hear a difference”