Does anyone play two pairs of speakers at the same time?

Has anyone seen the Tekton "The perfect Set"? It has a few tweeters in each cabinet!

The "speaker for each" instrument was the point of the Dead's famous "Wall of Sound" system back in the 70s. So it has been done. 

i have 4 speakers from the '4 chanell' days so i use all 4 in my 2 chanell system!!!

Why stop at four, one of my systems has 15 speakers and four subs. I even have a special name for that system. Home theater room. Sounds wonderful. Lol

I run a pair of AR3's horizontally stacked with a pair of AR3a's. The 3's are driving by a McIntosh MC2300, the 3a's a Mc MC2105. Both amps are fed into a Mc C22(original, not reissue) preamp(with Y IC's), and the preamp is connected to a McIntosh CR7 remote which is how the overall system volume is controlled. Doing this because I have the gear lying around and no place to set up a second system, but more to the point it sounds better. A lot better. In every way. And yes, it sounds excellent using just one amp to drive either pair of speakers. I pay little attention to so called experts on stuff like this because at 64, having been involved in audio since I was 15, and listening to and owning all kinds of gear, I trust my ears with harmless stuff like this. Works for me.