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jd, I cannot see any of PDF files, probably my current networks kills them.

I do not know the AK150 drivers. I know AK157, AK151 and K15/40. If they have significantly lower free-air resonance, at 30-35Hz then I am not sure that they would be more suitable for 40Hz horns. When you have 40Hz horn then he best driver to use in there would have free-air resonance around 50-60Hz. As you load the 40Hz then the reactance of air will increase the virtual mass of the cone and the resonance will be dropping almost twice. It is a good idea to have the drooped resonance a bit below the horn rate. If you have 40Hz horn then it would be nice to have 55H driver. In horn it will drop to let say35Hz and then you will drive it with back chamber up to 40Hz. If you have driver that are 35Hz in free air and let say 22 Hz loaded then the back chamber will be VERY small. Will it be good? I do not know. What I would be afraid in bass driver and ultra small back chamber is the compression…

The biggest thing that I wonder is how Mick made the Vitavox bass drivers to has 35Hz resonance. You can always use softer suspension and it will drive resonance down but it also make the excursion of the driver and much wider. Does the original Vitavox magnetic structure supports it? I do not know. On a different note Mike might make the gap a bit longer and use longer magma ring… No one knows what he did…. I personally do not see a use of those drivers. They would be fine for open baffles but I do not use open baffles …

Yes, it would be VERY interesting if Cessaro Gamma uses Vitavox S2 driver or Mike would come up with his own Macondo-type configuration. Still, since Vitavox doe only one compression drives and one bass driver then I can see that Vitavox will stick to 2-3 channels setups with big bass bin. This type of the speaker that Silbaone/GIP show up in Munich this year would be the most probable direction that Vitavox would go.

From my perspective I have less interest in the fate of Vitavox S2 driver.  I do not think that anybody would tell me something new about it, as well as the way how I use it in my system make my S2 very much un-orthodox S2 driver. However, the 15” bass drivers are very interesting subject. Vitavox was MUCH more interesting then any best Altec, JBL, Klipsh, EV, TAD, Klangfilm and a few other 15 inchers but I did not play with GIP, Goto, ALE, WE 15-inchers. I would like to see how Vitavox 15” would complete with those drivers in different applications.  Since the AK157, AK151 and K15/40 become available (even with new diaphragm that no one knows what they are made from) I think more and more people will use them and let see how it turn out to be in term of sound results. From a different side: no one built proper horns for 15” drivers. I need to pitch the new AK151 to Jeffery Jackson, he might put it in use….

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