Great Speakers - More is More?

Reflecting on my other thread desperately seeking great midrange, I recalled some of the holy grail audiophile speakers of my youth including the Quad ESL 57 and the KHL 9.

At that time, there was an interesting superlative which could be added to either of those names: STACKED!

Stacked Quads! Stacked KLH 9s! The Levinson HQD system featuring "stacked" Quads! Stacked Tympanis!

As I fine tune my listening room and enjoy the unusually articulate bass of my Tympani IVa's, I recall that it is often attributed to the unusually large surface area of the bass panels.

So why not "stacked" Magneplanars? Stacked MG-20's?

There was another thread discussing the surprising virtues of the cheapo Radio Shack speakers. In that thread, one of you suggesting "stacking" the monitors for a bargain priced "line source".

This seems like an obvious area for audiophile experimentation, yet no one seems to ever discuss it.

Please help me to buy more audio.