Thanks for the kind words on the cabs. I have read a lot about damping these horns and you are the first person to actually give specific information on how to. Thanks for that. At this point I think Ron AKA Sprkman57 and I are going to do some horn swapping to start with, the 511 and see how they run. I have noticed these cabinets have quite a bit of resonance to them. I also have placed what I think is too thick of insulation inside. So the bottom line is I have a lot of tuning to do and I really appreciate your help and insight. Tim