If there is some violation or a post offered in poor taste, that would make sense. But simply posting quotes of someone contradicting themselves shouldn't offend the censor unless the quoted party and censor have an improper relationship.
In any event, this particular line of "debate" is certainly not very enlightening or useful even for entertainment value. Maybe it would be "prudent" to give Joachim back his thread.
I remind, again, that very early on I suggested we not "hijack" the thread, but Joachim explicitly requested that we comment on the DSP aspect. I tried to add input in a helpful manner, but someone kept insisting that extensive distortion tests be presented and made quite the case out of it.
Dave
I tried suggesting that we end the current line of discussion a few hours ago while posting the above contradiction, but the post and repost got deleted. Whether you care to acknowledge it or not, improper censorship should be exposed wherever and whenever it should happen to occur. I'm clearly through "debating" with Johnk and have no further interest questioning him on any of his points.
Instead of criticizing people, admonishing them for engaging in a questionably pertinent side debate, why not post your own observations about what you think the thread should now focus on or what you think Joachim might want to discuss. It's easy to criticize and tear down. Being creative and positive - apparently not so easy.
Well, you've failed rather miserably on the creative and positive fronts. The only thing you have succeeded in is hijacking this thread for the sake of your own vanity.
Talk is cheap. Let's see some of your creative and positive side.
But if it makes you feel good to continue criticizing me, that's fine too - whatever floats your boat. 
My aim is to optimise this speaker mechanically and pneumatically, use linear drivers in their optimum frequency range and then make a passive crossover with the least amount of parts that do the job well. So my aproach is very minimalistic. If that works to my satisfaction i will try the UE when it is awaillable.
That's an approach that anyone should be able to embrace. The best engineering solutions tend to be the most elegant and simple. So are you tapering the tube behind the midrange or not. If not, why or have you not consciously thought about that particular aspect?
fntn, what i am doing right now is to tune the tube as an anti resonator to control the fundamental resonance. Then i build another tube with an optimised volume that is closed.
Then i build a passive crossover for both. Then i connect the drivers directly to the amp and put the rossover cap before the amp. Then i try to make all transfer functions the same. Then, when the acostic frequency response is hopefully the same i will make distortion measurements at high volume with a multitone signal. So it is 4 experiments in total. The tube of cause should be as short as posible because it contradicts the ZDL idea. On the other hand a very short tube is maybe not optimum for the required resonance parameters. Do you understand now why i am so slow and carefull ?
Then i build a passive crossover for both. Then i connect the drivers directly to the amp and put the rossover cap before the amp. Then i try to make all transfer functions the same. Then, when the acostic frequency response is hopefully the same i will make distortion measurements at high volume with a multitone signal. So it is 4 experiments in total. The tube of cause should be as short as posible because it contradicts the ZDL idea. On the other hand a very short tube is maybe not optimum for the required resonance parameters. Do you understand now why i am so slow and carefull ?
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Joachim, slow and careful is a sign of someone who knows what the heck they're doing
Did Jeff Joseph just pop on the scene with a loudspeaker that won Best of Show at RMAF two years in a row or did it take some time for him to master his craft?Just curious, do you have a target chamber volume for the midrange in mind yet? How are you calculating Q?
To maximally load your first three resonances, if your fundamental is 100hz, you're going to need a 22.5 inch long tube, right?
Maybe some Nautilus shaped thing would work if you did a translam type set up with lamination slices oriented vertically? What was Fs or what post were the measurements on ?(already up to 750 posts!!)I wouldn't get too worked up about taper. I should think the overriding concerns would be creating a throat behind the driver that is minimally reflective (and avoiding folds), keeping volume low, and maintaining optimal tube length. A really strong taper shouldn't have much of a detrimental affect.
Interesting approach.To maximally load your first three resonances, if your fundamental is 100hz, you're going to need a 22.5 inch long tube, right?
I wouldn't get too worked up about taper. I should think the overriding concerns would be creating a throat behind the driver that is minimally reflective (and avoiding folds), keeping volume low, and maintaining optimal tube length. A really strong taper shouldn't have much of a detrimental affect.
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