Ok, I just finished this, and am afraid it reads like a argument. I'm going to go back through, and try to work that out, but I wanted everyone to be sure that this is not my intent. I am not the best at getting what is in my head across in print.
My intent is to throw as much out there, so a common point can be found.
Originally Posted by GPM
that one only has the driver's suspension to work with doesn't meet my understanding/criteria of a BLH or TH equivalent of a reactance annulled FLH, so not sure what your point is, especially now that you've agreed with me that to get reactance annulling in a BLH, TH requires a considerably different alignment than conventional horn design wisdom dictates.
That was not exactly my intent, it was more along the lines of I could make a bunch of graphs that looked like yours if I didn't do a realistically sized sub horn
, and built a midbass horn instead with something like an EPS15-500. It's all about relative size.
As the size of the horn shrinks compared to the ideal, the throat peaks will get larger, and the electrical ones will be harder to suppress as well. It doesn't means that reactance annullance isn't taking place anymore, to me. If you look at the Nd horn traces from the other post you can see this pretty clearly.
I don't think a TH requires
a considerably different alignment than conventional horn design wisdom dictates to get RA going. Now you can
do it unconventionally, and I think I have figured out what you are doing, but playing with things myself, it seems like you can do it with normal designs, but I haven't worked it out 100% yet.
Here is an EPS15-500 straight off my sheet with only L12 reduced to .10, at 443l.
Here is the sim altered up to 750l, and 2.5:1 comp. At this point the mouth has become large enough that the tap really isn't necessary anymore, but it is there for them all.
Here it is again at 1500l, and 2.5:1 comp.
I could not get it any better from here without raising the compression a good bit.
It's all about scale, to me. Here is the same horn crammed into 150l.
If you use the HR sample tool on the Acoustic Impedance the relative location of the Reactance & Resistance are pretty close to each other, except for the peaks.
So at what point is it not reactance annullance anymore? I would really like to nail this down. If possible.