I have no clue what your pipe looks like or who said it was a 1 chamber pipe. I was just posting what I think it means and what the tuned part of a pipe actually is. The rest is (hopefully) a qualified guess. Nobody I've asked seems to actually know what it means. All I hear is repeats of what a sale broshure says..... if you get my drift.

You say your pipe only has one cone. Does it come apart so you can see it? Just wondering.