I am running klipshorns with B&K sound type A-4500 crossovers, a cayin TA30 tube amp and using a mcintosh c15 preamp. I listen to all types of music and like alot of bass. I am really disapointed in the bass output of the horns. finally I decided they needed some reinforcment so I added a SHU Research VTF3 MK-3 subwoofer. all I can say is wow! most impressive sub I have ever heard. I am still trying to get a little more bass from the k-horns is it that I am using a tube amp that is holding them back? any sugestions on getting more out of them? the corners are good and solid and they are sealed to the wall correctly.