Tried 2 pairs of speakers for 2 channel?

In the mid 1970's I used what was the a very popular speaker
set-up..called "double Advents". You set one large Advent
on top of the other..with the top one upsidedown...ie:
tweeters together. This was the beginning of the high-end
journey for many of us. I have not heard or seen much about
doubles since...but many current high-end cone speakers
systems...(Wilson and many more) appear to be doubles within
one model/design.

I bought four AR LST's (later called Cello Amati's)for a quad set-up in about 1970. When quad died, I went back to two channel and stacked them. I did not invert either of them.
Later Mark Levinson did the same and even made a custom granite stand (for $8000) bringing the total cost of the set-up to $28,000. He also did not invert them.
Hope this helps.

My speakers are not stackable (for one thing the resulting stack would be 10 feet tall), would a side by side arrangment work? If I made sure the front face was on the same plane for each "set" I am also wondering what problems might arise if I tried to spread them out a bit either on the same plane or all angled in to the main listening area. It is interesting to know that some high end manufacturers have experimented with the 2 pairs of speakers arrangment. I know if a person was to start over spending twice as much on just one pair is probably the best way to go, but if you like what you have and just want *more* of it......