How low are you wanting to reach and with how much authority?How much lower do you think i would get if i went with a 12 instead of a 10?
If you have another speaker suggestion, please feel free to share. I just love the way low notes sound and feel. You have been very helpful so far.
A larger cone will naturally resonate at a lower frequency but you also have to consider volume and port tune, they all work in conjunction with one another.
There are other options out there better suited to playing the lower end of the frequency spectrum. Do you listen to rebassed music? Back to the first sentence of this post- do you have an idea of how low you want to go?