I don't have the money to buy them right now, so, in the meantime, I will buy a couple of AudioSource Fifteen for 370 bucks. A single sub can do around 87dB at 20Hz, so I think two will give me around 93dB. Currently I run a KSW12 which give me around 89dB at 25Hz, so I expect a big improvement with the Audiosource's. I think I can make a couple of sonosubs that reach more than 100dB at 20Hz for around a grand. So that could be my next step, and then I can go for SVS. What do you think?