I have an SVS Ultra sub. It is rated form 15-100Hz +/-3dB. The driver is about as close as you can get to being bullet proof.The spl at 20 Hz is about 112. The sub has no filter. No one seems to know much about the s/w settings on Ultra2 receivers. This is not an Ultra 2 sub but obviously meets the performance demands. Do I switch the s/w ultra sub to yes or no? If I set it to No does that prevent the full range lfe signal from being sent to the sub? If I set it to No does that activate the bass peak level limiter which I do not want? Finally, If I select boundary gain compensation "Yes" does that merely "attenuate" the frequency below 30Hz as Svs thinks (but is not sure) or does it roll off the frequency below 55 hz which is what I read elsewhere? Thank you for your time. If you don't have time to answer the question does someone have a link that may help me. I would think more people would be able to answer these questions since Ultra 2 receivers are becoming much more common. I want to get the most out of my Ultra and don't really understand why the Sub needs to be Ultra 2 certified in order to select s/w Ultra 2 "yes". I also don't know why it's so hard to find out what selecting Boundary gain compensation ON actually does? Does it attenuate the signal or cut it and at what Hz?