Using two speakers for the center channel

I has checking to see if anybody has ever used two speakers for the center channel in a HT setup. I have Phase Tech PC 3.1 as center with Phase Tech PC 9.1 as front mains. I would like to use a 9.1 as a center, it is just to big. I was thinking of using two(2) 3.1's as a center channel and either placing the speakers along the top of the tv or split the vertically and have one on top and one below the screen. Same amp on both speakers, using a y cable to split the center signal.

I have a Bryston 9b and a 2ch Denon POA-2400a 2x200 amp. I was thinking of using the Denon as a center channel amp and using the extra channel of the Bryston for a future 6.1 setup. And use a sound level meter to dial everything in.

Thanks
Marty