Why don't you like Mageplanar speakers?

I owned Maggies for ten years, but moved on to dynamic speakers for two main reasons. As well as they did many things, realistic bass with "slam" was not one of them. The other thing is that they're something of an interior decorating conundrum if you don't have them in a dedicated listening room. It's hard to integrate two wide, door sized panels into a living space gracefully IMO. Also, they're picky as hell about partnered amplification if you're looking for the absolute best possible results.

I dislike my Magnepan 3.6s because i bought them about a year before the 3.7 came out. So NOW i want some 20.7s to make up for NOT having 3.7s.
That is why i hate Magnepan.

One of the best reasons to own Magnepans IS to not have all that bogus 'slam'.
I live in an apartment, and enjoy the fact the bass does NOT travel down the other apts or above or below. GREAT.
If you need all your neighbors for blocks to hear your bass, then maggies definitely are not for you.

Bass violin, Tuba, Organ's low notes are the instrument no Maggies will ever play even dropping the fact about 'slam'.