So Ive had my subs in the 10 cube 35Hz box for a while, and I am extremely shocked. As expected, it is so much louder, inside and outside. You cant hear the towers outside, but you can hear the small box down the block. No surprise.
What does surprise me is being tuned to 35Hz, I am loudest at 47Hz but it falls off hard and fast both ways. Playing rap music centered around 35 is quiet. Excursion is minimal, the port blows air, but it's just not super loud.
Now to contradict what I just said, I am amazed at the subsonics I still get. I watched The Last Samuri (sp) and Children of Men, I can't believe I still get plenty of subsonics 1.5 octaves below tuning, enough to jiggle my bed. It is a completely different experience, its LOUD and booooooms, but I thought Id have bad over excursion and NO low end due to unloading.
All in all, I wouldn't trade my towers for the world. It is more viceral down low where I like it, it sounds a million times better. Its fun to experiment and it's good to know the difference, but I cant wait to get my act together and brace the towers.
BTW, I sold 2 of the 18's and put 2 more in there, when I did I re-wired and have an EP4000 per sub now, 8 ohms, a whole world of difference. MUCH louder, no more tripping breakers, no more lights dimming.