A larger/more powerful sub will just be able to reproduce reference levels at even lower frequencies. And perhaps be able to keep up a little better if you turn the main volume to 0 dB.

No matter the size of the sub, properly calibrated it will not outshine the rest of the speakers.

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