Originally Posted by Ricci
I still don't understand what your point is John?... Is what my point was! The above description has been known for a long time sure. You seem to be saying don't waste your time or something to that effect. We know how airplane wings achieve lift, but at some point you still need to put them into a wind tunnel right? Can you tell me how much the even order distortion will be reduced, or over what range with the particular drivers and cab shape used? Maybe there is a huge difference, or maybe it is not much at all. There seems to be a limited number of good quality public measurements of the difference. It will be relatively quick and easy so why not.
Yes, if looking at a single frequency sine tone with harmonics on a graph, I could probably venture a pretty close guess at the reduction in 2HD and 4HD.
What I found in messing with the 1 driver inverted tests is that a)it takes a very special driver so that driver self-noise isn't worse than the benefit in even order harmonics, b) when even order harmonics are reduced, the balance of harmonics is grossly tilted toward odd order harmonics, and most people I asked preferred the even order balance vs the tilted-to-odd-order presentation and c) the difference is audible only when seriously driving the subs, which is not the preferred method of operation in actual use, making the whole thing a moot point in the end.
IOW, if you do the test, LMK how it sounded to your ears because self noise will most likely be out of band of your graph and resulting data.