Maggie makes only 1 model of the 3.6's. There are no levels of models of the 3.6's.
The 20.1 is the only Maggie with a Quasi-Ribbon midrange.
The 3.6 has a planar midrange like the older 3.5 & 3.3.
I've been waiting, (patiently!) since I sold my 3.3rs for a 3 series Maggie w/a Q.R. midrange. The Absolute Sound is the only magazine I've seen that detailed the performance jump when the 20.1 was auditioned with the Q.R. midrange, (I don't remember the issue #, sorry!)
I own Apogee Mini-Grands now & they fill the bill (for me)quite nicely!
The Magnepan website is pretty vague on this, maybe your nearest dealer can help....
Danie1k141- Thanks for the clarification! I new the 20.1 used a push/pull type driver and I was unsure about what they meant! I am trying to arrange an audition on the 20.1's but the dealer in my area has never sold a pair of 3.6's let alone the 20.1's(mine came from different dealer), so it makes listening to the 20.1's difficult. There is a guy with a pair of MG20's in the area but I am not sure of how much of a difference there is between the .1's and the older model. In other words the local dealer near me is useless :o)