GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: "O Vitavox, Vitavox! Wherefore art thou Vitavox?"

Post Subject: Now that's what I'm talkin' about!Posted by jessie.dazzle on: 7/1/2011

Nice work; bravo Mike!

With regard to improvements to the S2: Apparently Romy's prayer, one of them anyway, has been heard and would seem to have been answered; a diaphragm-centering guide has at last been added. As for the rest (other improvements/differences?), getting rid of the secondary resonance would seem a worthy goal but I believe Mike's aim was, at least at this stage, to offer a driver that is identical in every way possible to the older production S2, so in theory, that would mean they should still have the "beneficial" secondary resonance. I'd love to compare this latest S2 to the ones I use.

I see that along with the K15/40s (15 Ohm) and AK151s (8 Ohm), Mike is also offering the AK150 (15 Ohm) and the AK152 (8 Ohm) variants. These last two drivers have a frequency response range from 30Hz-5KHz and "bass resonance" (which presumably means free-air resonance) at 30-35Hz; both significantly lower than the K15/40 and AK151 drivers.
http://www.vitavoxhifi.com/pages/pdf1.php

This of course has me thinking... What about using a pair of the AK152s in my 40Hz horns? Those Fs down around 30-35Hz would likely need to be raised (rear chamber volume reduced to non-existent), but possibly worth the trouble as the AK150s have a 3Khz-lower natural HF cut-off. Translation: One might get away using a less sharp filter. Also, even if the AK150 is not driven all the way down to the horn's physical cut-off (40Hz), the fact that this driver is rated to go down to 30Hz should mean that at 40-50Hz it is much less rolled off than an AK15/40 or AK151 would be. It might also mean adding a filter at the lower end.

I imagine Mike will now be flooded by requests for diaphragms and binding posts. What's really of significance here is that it is now possible to put intoproduction a system such as the Macando (or my own system which is Macando-based), using new drivers... Just get Rakesh to keep the Fane-Chain cranking and there'd be no need to find an alternative to the 8M. If I ran Cessaro, I'd be knocking out a prototype version of the Gamma equipped with new production S2s...

jd*

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