Rampon - seems to me driving two centers in parllel would be okay provided the lower impedance did not overly tax your amplifier. This configuration might be more challenging than my parllel surounds because the center is typically working "harder" (most of the sound is from the center speaker). It would be good to review Alan Loft's article "Secrets of Amplifier and Speaker Power Requirements Revealed" (http://www.axiomaudio.com/power.html) to do some quick calculations.
I will be using a Pioneer VSX-1015TX receiver (120 watts/channel).
