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.
