Will PM4A/5A extend flat to 100HZ on OB?

Hi,

I am thinking about building a two-way or three-way open baffle. And I am deciding on the fullrange driver. I may pick supravox 215EXC or Lowther PM4A/5A. The biggest buffle size I can allow is 60CM*130CM.

I am sure 215EXC can easily extend to 100HZ and below. And I have heard only good things about Lowther midrange.

So will a lowther PM4A/5A extend to 100HZ even on a small OB? and How small is too small in this application?

Will you pick supravox or lowther?

Thanks a lot. :)