All of the Gedlee speakers are sealed and do roll off around 80 hz. You will want a sub of some kind with them.
The size of the woofer in the Gedlee's is large because it is specified to match the directivity of the horn at the crossover frequency. It isn't that size to make more "bass" as it typically seen.
Just to correct a misunderstanding. Where someone said that the Gedlees were designed for "small rooms" refers to small, as in a residential sized space, versus a large commercial venue like a nightclub, etc. Not a small room of a house. They would probably be a better option in that case, as well though.
-Tony
Its funny how if you say "optimized for a small room" people take that to mean "not good for a big room"! In fact, this is completely false. The original Summa was designed for my home theater, then we used it in a night club and it worked so well that AI was formed for just this kind of application. I have Abbeys in the auditorium at the local school and they love them - this is a huge room. They can't say enough good about them. The fact is that you want big speakers in any size room for the same reason - directivity, but maybe for different end reasons. In a big room directivity puts the sound where you want it and helps with the reverberation issue, while in a small room directivity minimizes the early reflections yielding a better sound staging.
You are quite right Tony - the woofer is large for directivity, not power handling. Sometiomes, like this application, the power handling works out quite well. Honestly, only a set of speakers like mine are going to work in a room this large. Anything with the classic 1" tweeter is going to be completely under-whelming. Only a compression driver could fill this room with sound. And if you are going to use a compression driver, then you need a good horn/waveguide. Since everybody copies mine, they must be good (although nobody else can use foam, because I have a patent on that). If you are going to use a directional waveguide then you need a big woofer to match the directivity. All of a sudden, you have an Abbey or Summa - how did that happen?