No, it shouldnt need to go lower....The Human voice is all about midrange....from 250hz to 4hz at best....more like 500hz and 1k for the most part in dialogue....
Once you get lower than 125hz you are talking about bass related music and that wouldnt apply to the human voice...100hz or so is more than enough "headroom" for a center speaker...
Based on a typical music studio mix you would get these generalizations:
125hz - bass guitar and kick drum
500mhz - vocals (but somewhat nasally part of the vocals)
2hz - higher vocals and guitar
really, I would expect all vocals & dialogue to fall between those numbers except in the most extreme cases...
