In a Home Theater set up, I disagree that there should be 3 Identical speakers in the front.
In a Home Theater, The center rules all the other speakers.
The other speakers are not as important because of the sound program.
That's why if yer in doubt, unplug the center and play a movie or TV show
in 5.1 or whatever and listen for yourself.
In a "Home Theater" if the center is weak, the Whole System is Weak.
YMMV