I did the center channel thing years ago with a mixed mono center and a single polk egg. It sounded pretty good, but not good enough for all the trouble. Honestly, it really didn't add to overall sq, but it did draw the image toward it a little more. Conclusion, if you are hard up for imaging definitely worthwhile, otherwise just get good front speakers and install them properly and you will get pretty good imaging and soundstage.

 

I'm not a fan of center channel at all, I know why it's used and sometimes it's the only solution, but I HATE it. Other than for a 5.1 system.

If you don't have good center image after proper speaker placement and tuning, you need to start over again.

 

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