Well, i have the same question but with regards to the songtower that hopefully i will be getting in a few weeks.
Anyway, instead of high passing the fronts, what is theword on running the fronts full range and having the port blocked/covered with some sort of cloth so that it will act similar to a sealed cabinet. Since the TL uses much larger cabinet, i'm not sure how that will affect the bass drivers.
I currently have my Sierra with this type of set up and the integration has been great, with less localization of the sub. But im not sure how would that apply to the songtower and what is the word on this kind setting.