There has to be something to isolating the speaker from what it is sitting on. After I got the Auralux MoPADs and put them under my center channel, I re-ran the auto-setup of my receiver and it detected it as a Large speaker instead of Small. So it seems that it was producing more measurable bass.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris