Yes op if you want to biamp a center speaker. You need two power amps or rails from the same amp. 2,3,4,5, etc.
Some amps have a mono/stereo input switch. Some bridge the two rails for a single output and double the power (YUK)
Install a RCA/XLR splitter (if you don't have a mono input switch) and input the center signal (from the preamp/AV/HT unit) to both L/R inputs on the power amp. Then remove the jumpers at the speakers and use TWO sets of speaker cables. L/R to the top/bottom on the speaker and the same for the remaining R/L speaker cable it goes to the bottom/top.
Have fun.
Regards