Sealed box dual woofers Each with a different "Q"

diyAudio Member
Joined 2007
Years ago when talking with another speaker builder who happened to work in a speaker repair place in Melbourne he mentioned using different box sizes for equal woofers. Different "Quality factors" and while I messed about with doing so once the resulting speaker wasn't one of my best efforts and I trashed it and put the drivers to one side.
So I'm working on a box here as a gift for a mate and it used to be a ported box with a shelf divider but this shelf isn't in the middle.
I'm wondering idly if I should plug the hole in the shelf and instead of using a single inductor to use separate inductors in a 3.5Way speaker with each woofer in different sized boxes.
I'm now going to test the woofers using my new DATS and see what the parameters are but one compartment in the speaker would be twice the size of the other
 
More of a Mid-bass driver really and with an Fs of 41Hz it will never produce big bass in a sealed box. But with one compartment being ~13 litres and the other being 23litres I get separate Qtc of 0.7 in the larger box and 0.83 in the smaller with the peak being at around 140Hz.
My mate will really need subs if he wants big bass and I see little point in making separate sections