Try aiming the speakers about 2 feet in front of your listening chair so they cross in front of you.
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Definitely too far apart to cause a lack in centre imaging and bass definition.
You will have to move them closer to each other, or sit really further away. Also as morningstaraudio mentioned toe them in so they cross in front of you. but I still feel that you will then lack the bass oomph!
my thoughts- move them closer to each other till the centre voice balances in weight and volume to the other instruments. too close togther will make the centre fill too prominent.
I agree with Neville. Move them closer together. This same issue plagued me until I moved my horns a little closer together than the distance to my listening position. For instance, I sit about 11' from the mouth of both horns and they are now about 8' apart from each other. I believe this is due to the more direct radiation of horns.
The toe-in may work for you. It didn't for me. Probably some room interaction here. I find mine sound best when aimed just outside of my position, over each shoulder but not crossed. I'm not one to make a big deal of imaging so I happened upon this setup through experiments to remove other artifacts I was hearing at the time.
The shape of the horn figures heavily in this matter. Mine are only 40 degrees dispersion pattern. This is pretty narrow but necessary in this design so that the horn unloads at the proper rate. Mine, therefore behave better with toe-in and I am better off being back some twelve feet or more. If your horn has a much wider dispersion, you might wish to spread them further.
If, as I suspect, you are dealing with an off-the-shelf horn, there may not be any right way to perfect it and you'll have to just experiment until you get something you can live with.
Vertical dispersion is very narrow in tractrix designs and limitation in that area may be contributing to your problem.