Dude, welcome. Disregard what you may have heard about the VP-100 sounding "thin"; if it was properly set up, especially the crossover frequency, it doesn't have such a problem. My own suggestion for a center to match your M22s would be another M22, positioned vertically of course, or an M2 which would be nearly the same, if you'd want a smaller center. Since your room isn't very large, the QS4s should be excellent and would save some money.

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Enjoy the music, not the equipment.