I'll be sure to tell Mark Seaton & Jeff P. that they're doing it all wrong since you clearly know more than they do.
We are not talking horns, but coupled cavity band pass designs.
I would advise anyone that TLS Guy strongly entrenched in his values when it comes to speaker design. He is incredibly passionate about the hobby and has been involved in it on many levels a very long time. While I will always contend that as technology evolves there often becomes more than one way to accomplish a design, speakers have been around a long time and their pricnciples have been slow to change. I'm sure if you asked for an explanation of his thoughts, TLS Guy would spend the time to elaborate in detail enough that perhaps what he knows would not be called into question.
As far as Jeff is concerned, I'm sure his products are nice, but after speaking with him on the phone doing some market research as a "potential customer", I am not sure how much experience he has in the industry. He has a unique, one-man-show operation that I hope grows into whatever he wants it to be, but that does not make him a preiminate be-all end-all speaker engineer. People seem to really be passionate about his products, though, and that's a good thing!
Unless someone has substantial experience with JTR or Seaton speakers and their design, they're just echoing heresey created by the inernet.