Hi Guys, Wayne
Wayne, for the sake of the people here, lets put this in perspective.
First you argued against the Lab sub design approach, the Math I used which wasn’t what you used and then took the position of "who needs it" in your posts. A few of those posts;
http://www.audioasylum.com/forums/HUG/messages/49834.html http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=50017&am p;highlight=labsub&r=&session=
Then, at some point "the light went on" in your head and you accepted that the heavy strong driver approach you had vigorously argued against, might work after all.
But…. You saw flaws that you could solve if you only ignored one of the main design criteria (the size the group requested) an went "push pull" which reduces the least offensive 2nd harmonic distortion component. This, without bothering to mention when the Lab sub was already the lowest distortion sub measured at the real Sub shoot outs.
Then you began painting a picture about the driver being "easy" to damage but thankfully your "rear hole" plug fixes that too you claim (at least with your test signal).
This too without bothering to mention that the Lab sub was the most powerful of the subs tested in the Sub shoot-outs.
This is very unfair to Eminence and the PSW Labsub forum, you have never even built a single lab sub let alone played /measured an array of them as they are to be used. While your "predictions" don’t show it, even the measured response for one lab is within 1 dB or less of your measured response.
You have no idea (at least using the response model you show) what an impedance curve for 4 or 6 looks like compared to the Pi copy, THAT impedance is what will govern the I^2 X R heating in the VC. Your revised box reaches Xmax first, will be less efficient, produce more heat in a large group.
You have not couched your criticism of the driver in terms of how loud / low a Lab sub setup goes compared to some of the very expensive, very inaccurately specified "Pro Sound" subs that the majority buys. That is partly why I offered to design the darn thing in the first place, to help foil some of the silly / impossible claims that were made about some popular subs.
Also, unlike you, this was not "for profit" venture, I have no PI forum, there is no organization that benefits from this, except possibly for Eminence who offered to make the driver "back then" and PSW who hosts the site..
Lastly, step back and consider your challenge, who / what are you challenging?
Why would a sound company, who has a group of Labs and knows what they do, haul them to your site so you can see "IF" you can blow them up with "your" test signal and then, assuming they do blow first (with your signal) you ask THEY then pay you $1000 for the privilege?
Your logical process seems chronically flawed somehow.
Cheers,
Tom