I'm going to give dual centres a try with a couple of monitors to see how they sound, much like Hutzal's setup. If set up properly at the right distance apart and sit at the sweet spot I see how it can work. Any recommendations not to use dual centres have to do with acoustical problems such as comb-filtering, lobing, cancellations, difference in arrival times, etc. when you move out of the sweet spot. The other thing I've noticed is that people who report good results are more often than not using 2 way vertically aligned speakers as centres.
