Thanks Ian and Andrew!

I don't use an 80 Hz crossover - my LFR's and VP180 are running full range.

In my current setup I probably wouldn't have enough space behind the centre to allow for good performance of an LFR style speaker. But I would certainly be able to accomodate an upgraded VP with 2 or preferably 3 of the new woofers. (I expect I'd order one about as soon as you guys figure out how to make it - if not sooner!) I also eventually will build a new HT room and would plan to fit an LFR centre if at all possible.

So I am anxious to hear more about what might be doable!