Has Anyone Ever Run TWO Identical Pairs of Speakers ?

So I just got another pair of Focal Sopra 3 for another room but decided to try how it would sound to have 2 pairs running side by side in the same room with the same integrated amplifier (Anthem STR). Initially I placed them side by side and the sound was visceral and the dynamics were unbelievable. But the sound stage got muddy. Then I measured the tweeter distance from listening position on both pairs and got them aligned as good as I could so that the upper frequencies would reach my ear at the same time. The sound stage got much better and all the qualities of running both pairs at the same time were still intact. I must saw I am in complete awe. The sound is so much more enveloping, real, effortless. The bass is more even and full. I also got rid of some of the peaks from the standing waves, which could be a result of having both pairs in slightly different locations in the room. Absolutely Loving it. Now I’m not sure if want to take one of the pairs to the other room and just want to leave them both side by side. Will play with placement to get it aligned even better to get the sound stage to be as good as playing the single pair, if that is even possible.
Having a lot of fun with this!

Yes. I have run 2 pairs of Quad 2905's simultaneously, but not side by side. There are theoretical reasons why 2 pairs of the modern Quads won't work together (the delay lines in each speaker create the illusion of a point source 1' behind the speaker, and you can't have two of those on each side), but if you think about it, there are alternative alignments.

And some of those work for me.  

OP still hasn't said what speakers he's using, but I think it's a bad idea no matter what they are.

It'll be a bit like Tektons.

I plan to double Polk RT-2000p’s. They’re  listed in my profile at www.tinyurl/mcintoshrules if you’re that interested.

The only speakers I’ve heard recently that REALLY IMPRESSED me were:

Revel F328Be’s for $16,000/pair, and
Tannoy Canterburys for $15,000/pair.

I could buy either of these right now, but I really like sound of my Polk’s. 
Anthony Cordesman gave them an exceptionally rave review in Audio magazine in 1999 and he specifically  commented on their remarkable imaging and sound staging as well as their exceptionally good midrange and highs (his words, not mine). He was lukewarm on their low bass but that’s not an issue for me. 
I use a Sunfire Tru Sub MKII AND a very large great sounding Cambridge Newton P300D sub that uses six 6.5” speakers for subs in a push/pull configuration and they are remarkably fast in an 90lb. hefty metal cabinet. Unlike the Sunfire, there is virtually no cabinet vibration when it’s running because of the push/pull configuration of its six bass drivers.

My center channel sub is an 18” Hartley custom made for Jon Dahlquist when he was developing and voicing his DQ-1 sub he made to go with his DQ-10 speaker. I happen to know Jon personally and the dealership I worked for in back in the 70’s was one of his first dealer.

I also have two passive M&K Goliath II subs I cross over at about 80Hz with 4 Polk LS/FX two way dipole/bipole speakers I use for Dolby side surround and Dolby rear surround speakers.

And I  use four Realistic Minimus 7 speakers for Dolby Atmos speaker that will be crossed over at about 100Hz  with some small Definitive Technology active subs with 8”woofers.

I really can’t restrain myself for saying this, but I do believe I have my bass’s covered.😂

 I’ve listened over the years to many products Anthony’s reviewed  and I generally agree with him.

I found a second pair of mint RT-2000p’s for an exceptionally low piece so this will be an interesting low-cost experiment for me to hear what doubling them does . If two pair really suck, it’s been a vert low cost experiment for me.

But then there’s the possibility I could be incredibly surprised for significantly less money than a new pair of Revel’s or Tannoy’s.

I’ll know in about 6 to 8 weeks as I’m moving to a newer home with a much larger listening room. I’m on the wait list for my very busy electrician as I’m going to install a whole-house surge protection system and two 30 amp/120 volt circuits for my electronics.

as always, in all things audio , YMMV😎