Hi, I'm the 'new guy' here, but I have owned Speakerlab 'K' speakers in the past, and now own OB from Decware(ZOB). Your question is a kind of apples and oranges sort of thing. No doubt the K's have bass that FEW speakers are capable of. In fact I have never heard bass like that again. Having said that, the OB speakers that I have and any other OB speaker will NOT have anywhere near the impact of a folded horn. That is not to say that they don't have good bass. In fact, I find their bass to be more natural and musical. It would be a good idea to hear OB speaker design before you make a decision since the sound of each design couldn't be more different. Greg

P.S. here is the ZOB design that I built. You can read about it in detail on the Decware site.