Due to space considerations, we don’t currently have the largest Magneplanars on hand. We have, however had them in the past and can certainly get hold of them for a demonstration if required.
This next level to the 1.7i, the MG 3.7i, certainly brings more clarity, control and bass extension. They are only a few inches taller and a few inches wider, although this does mean quite noticeably larger. Big conventional speakers are often easier to drive by virtue of the greater efficiency but, with ribbons, the reverse seems to be true. The 3.7 is a lot more demanding.
The frustrating part is that it is easy to tell how good the 3.7s are despite knowing that they are not giving their best. Where the 1.7s are quite amp-friendly, the 3.7s need something fairly specific. In our rooms, we cannot get particularly good results from them with Naim. They seem OK with Trilogy but a whole lot more complete when driven by the Chord electronics.
Resolution is extraordinary. You can hear words where once there was a blur. It becomes easy to detect accents, subtle details on familiar recordings that have remained buried for years. Once you settle to their change of delivery, they are capable of a very natural and musical performance.
As with a lot of thoroughbred products, positioning, cabling and partnering equipment all matter greatly.
But, my word, they are good!