I just received Adire Rava sub. Hooked it up to the LFE channel of my HK AVR8000, went into calibration, and... oops. Well, it does play. It does produce some bass. It does go someplace low. What I found is that my Paradigm Studio 100s (running of Sherbourn 5/1500A amp) go lower and what's more important they go there cleaner. The sub begins to distort at about -25dB, long before I feel the sound. The distortions sound like mini explosions in the sub, so the bass starts sounding very dirty. The Paradigms (when configured without a sub) don't distort until... no idea when, I'm afraid to go there as my windows begin to rattle too much (but I can go at least -15dB.) When the Rava is set as the sub, it begins to rattle itself long before the windows begin! What a disappointment. I'm not sure if it is a defective sub or what, but it's definitely going back on Monday. Now I really don't know what to do. Maybe I'm spoiled by Paradirms and need more expensive sub. Or maybe I don't need a sub at all. In any case I'm not sure if I want to take another chance with one of the Adires. Maybe I should look at SVS subs, althought too bad I don't care how they look at all. Or should I try ACI Titan II?