If you mean the 'blanket' to 'ring' its harmonics down + the other, then seems reasonable to me; otherwise, considering 80 Hz = a ~34400/pi/80 = ~137 cm/54" sound 'bubble' squeezed in the cab along with all its still large harmonics, then unless it's very large it seems like the density required could be enough to act more like a solid, making normal stuffing to turn it from adiabatic to isothermal the better choice overall like Bozak did with it huge Concert Grand.
Further inquiry suggest that anything touching the membrane would disrupt the modal frequency. My next question is why is compliance not a part of the equation? You could have 1/8 mdf or butyl rubber but one is more compliant; surely this has an effect on frequency and q.
on post #135 HR screen you typed poc3, is this poc3 folding ?
https://www.diysubwoofers.org/projects/other/POC3/
Not me! ~25 Hz - 533 Hz hypex, Midbass BR would actually be in the form of a TL since Vas is so low.
I see more and more of your Vas arguement while messing with a bunch of drivers in horn response.(or manually manipulating imaginary TS parameters )
It DRASTICALLY helps in a lot of my otherwise obnixoous HOQW designs, especially those that piggyback the same resonance in both resonators and just ring like crazy and don’t wanna shut up 💨💨
Emergency blow (submarine) of the ballast tanks …. Only thing fun I ever did in the navy that was ‘legal’
I knew what it was, just not why posted....... Yes, I imagine it was quite thrilling......My health kept me out of the military, though was involved in numerous military contracts including subs, so got a little 'taste' of living in one, which definitely was not for me, so kudos and thanks for your service! 
what you were referring to, i assume, was panel or diaphragm absorbers. now that i understand more about them, i understand that attaching a panel directly to a foam substrate is not the way.
i have a question about traditional tapped horn... has anyone had issues with port velocity noise with large woofers? i have a maximum port velocity of 28ms and the woofer would take up most of the mouth area.
Correct.
Not me, but haven't been around many different designs other than DSL's and yet to build a TH beyond a cobbled together a small POC, but here's one I simmed with an 18" that was built by others in an old fireplace and it sims with incredibly low velocity, so please export yours.
Not me, but haven't been around many different designs other than DSL's and yet to build a TH beyond a cobbled together a small POC, but here's one I simmed with an 18" that was built by others in an old fireplace and it sims with incredibly low velocity, so please export yours.
I’m trying to build something for my truck that has very high power density and a 28hz fb. the reason the one I summed has high velocity is because the woofer has a sd of almost 600 a xmax of 32 and a vas of 18l. It really has little to do with the enclosure. I could possibly make the mouth larger but if I have to go bigger I would just go with a different enclosure all together.
The horn will be 14” internal width and the depth will be 30-31cm iirc at center of magnet. This is a square woofer so you can imagine the space it will occupy. 28ms is at xmax at tuning. FYI this is the kicker l7x12. It might be the best subwoofer you can buy. I’ve posted a sim already on this thread for possible output. It’s capable of over 140db in .5pi @30Hz occupying about 200L of enclosure. It also has a completely bolt on top assembly.
https://www.kicker.com/app/tsparam/41L7122.html
Tapped parallel resonators capitalizing on the shared resonace at 3 x Fb. These are super ‘loud’ when I used the skar ddx12. Sort of like a paraflex but without some of the extra ‘fat’ I suppose
Tapped parallel resonators capitalizing on the shared resonace at 3 x Fb. These are super ‘loud’ when I used the skar ddx12. Sort of like a paraflex but without some of the extra ‘fat’ I suppose
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