Has Anyone Ever Run TWO Identical Pairs of Speakers ?

Fiesta75 wrote: "Also series speaker connections are not recommended by anyone I know."

Well, you don’t know me, but I recommend (and use) series speaker connections in situations where it makes sense to do so, which of course depends on the specifics.

Many years ago JBL published a white paper with misinformation about series-wiring loudspeakers, stating that doing so degraded the electrical damping (Qes). Since JBL was the source, that misinformation has gone largely unchallenged and become audiophile folklore. Adding a resistor in series with a woofer WOULD degrade the effective electrical damping, but adding another driver in series DOES NOT because the BL of the first driver is ALSO added. Double the resistance AND double the BL, and Qes stays the same.

Duke

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.