6.5 degrees half angle would make it 13 degrees included angle as I mentioned.It was 6 or 6.5° (I don't remember the decimal places) - half angle.
Have you done any listening comparison?
Also, how much Aquaplas did you add?
Will send sample diaphragms to Autotech for evaluation. Hard to say how much Aquaplas - just to cover diaphragm completely with white coating. About 7-10 layers.
The sensitivity takes a big hit from the extra mass of the Aquaplas.
Standard application recommendation for optimum damping of diaphragm resonances is to cover the center 25%, as that is where amplitude is greatest.
If you wanted to get fancy you could effect constrained layer damping by adhering a small disk, or maybe two crossed strips for less mass, of aluminum foil to the center of the diaphragm.
Standard application recommendation for optimum damping of diaphragm resonances is to cover the center 25%, as that is where amplitude is greatest.
If you wanted to get fancy you could effect constrained layer damping by adhering a small disk, or maybe two crossed strips for less mass, of aluminum foil to the center of the diaphragm.
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Hi jzagaja
did you ever get a chance to listen and measure the B&C DCM50 with one of your horns?
i would be especially interested how it sounds and measures w/ the Iwata 300 ?
thanks
Not yet. We use BMS and Radian/Truextent.
jzagaja, was there any development re B&C DCM50 and your horns?
if you haven't had a chance, what would you recommend as the best horn from your production to extend a lower end as much as possible (recommended by B&C is 400hz but i would love at least 350hz with few watts...) while having clean dispersion without beaming or other nasty artefacts.
also i can't find more comments on your minphase 200 horn, the price is much more affordable than JMLC and it looks like it has a very similar lip-over. how does it behave in the mids?
are there any plans for really big OSWG, like 18" or similar? since i've heard geddes OSWG (from summa), i think it's a way to go in smaller rooms....
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Today I've learned how to store graphs in BK2012. This is quite easy - you have to chose plotter as output device, then open in ABViewer for example and format. Quick and dirty comparison between 12BR70+D800Ti vs. 12B100R+DE500. Level was quite low a bit below 1Vrms but I couldn't set more because of family members. I'm sending Mummy 4 (12BR70+D800Ti) with minimalistic crossover to Lukasz for voicing, attaching Aquaplased diaphragms.
Pink is 12B100R
Pink is 12B100R
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Mummy 3 (12B100R+DE500) measured in BK 2012 analyzer with and without reference resistor versus LIMP with reference resistor 18Ohm. Obsereve change in tuning frequency and Q of resonance peaks.
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