Does anyone know where I can find a comparison of all the popular bass shaker / transducer / whatever else they call them. haha I am interested in going with this type of product but don't know what brand or style to go with. I have seen the following: ButtKicker "LFE" (also, I do have the Berkline 099 theater chairs) Aura bass-shakers Clark tacticle transducers Crowson Tacticle transducers Any info would be appreciated and if there are any that I have missed and should concider please let me know. And lastly, the mounting style/position. on the seats themselves or in the floor trusses?