Two mono center TV speakers out of phase?

Good thoughts in the preceding posts, except that I would respectfully disagree with this statement:

I don't think that putting mono speakers above and below the TV will make it sound like the sound is coming from the TV. The sound will still come from the speakers above and below the TV. That's what mono is and does. You need stereo, not mono, to do what you want to do.

There is no difference between a pair of stereo signals with identical left and right content (or in this case, top and bottom), and a mono signal fed to two identically placed speakers. You can easily verify that by playing a mono recording through your system; the result will be a focused image centered between the speakers, assuming the speakers and amplifier are connected in phase, and that there are no significant channel imbalances.

Although in BOTH cases I believe that Hhiggins is correct that if the speakers are too close together, comb filtering effects can occur at frequencies which are high enough to make the effects audibly significant.

Regards,
-- Al

I had an extra speaker when setting up my system. I tried one for the center and two next to each other. The pair sounded much better. I laid them down with the tops facing each other. Ran a Y splitter to 2 channel amp to run the speakers. It worked great for many years.

If you put one speaker up high and one down low, you will get the signals at different times which could muddy up the sound?

"There is no difference between a pair of stereo signals with identical left and right content (or in this case, top and bottom), and a mono signal fed to two identically placed speakers."

This is correct. A stereo signal with identical content left and right is, essentially, a mono signal. And of course, you should get a centre image if everything is set up properly as you would with a stereo pair. Therefore, upon reflection of my earlier comment, I would say that Almarg is correct about the imaging issue. However, proper distancing so that the two mono signals are not interfering with one another remains an issue to watch (or rather, listen) for.

Just do it!

Thanks for your comments. I still don't see why two mono speakers equal distant to the sweet spot using two identical amps will cause a problem. I'm using a 52 inch TV screen so I don't think that distance between the speakers should play a role. Perhaps connecting the two speakers to the same amp in series may have this negative effect, but I'm just guessing. I wouldn't do that anyway. I'll take Cyclonicman's suggestion and just do it.