Large Format Dual/quad 12 30hz TH

[xrk971]

While the stated Xmax is a little less, you might want to run some simulations using the Beyma 12MC500 and see what you think.

Thanks for the tip - I will check it out.

 

[papasteack]

Hi,
For high power/high xmax/low qts pro drivers ... As we can see every sort of claimed xmax, i only look to airgap and winding to make my opinion...
So, what's about ciare 12.00 SW 10mm airgap, 33mm winding vs 12//29 for the faital 12hp1030...but 0,38 qts. Xmax is given for 11,5, but from airgap and winding, it should be more. 1000w aes power handling. 4inch voicecoil too. More or less same price. "But" rubber surround...
Or sica 12 S 4 CP a bit cheaper. airgap 10mm voicecoil 27mm...sica don't give linear xmax in their datasheet but the real usable 10%thd xmax, and as b&c do. 0,26 qts, and a bit low mms, only one spider it seems and given for 700w aes.

The beyma 12MC500 has only 10/19,5mm airgap/winding...

 

[sine143]

Like I said, this is just a proof of concept sketch.... taking the idea in my head and making a model out of it so that I can show you lot and hopefully get some feedback on it. As far as I can tell with the limited math I did while drawing it up, there is ample s2 area (one of the main things I was concerned with with this style fold). I'm a bit worried by the amount of mouth restriction the throat/baffle section will impose on it though.

I should be able to fit betwee 390 and 420cm of horn in this fold, in a decent sized box. I"m gonna have to bust out akabak to try and model the 3d turns though.

 

[papasteack]

...just to say, thanks for the folding idea : I have a t-tqwt project for wich closing mouth of your project, and opening S1 as my mouth's project, it should work well ^^.

 

[sine143]

make sure to send me some pics of your fold!!! I'm glad other people found the concept interesting... basically "dreamed" it up whilst trying to fall asleep, intoxicated, over independence day weekend. I think its very versatile because the first section (s1 to s3) can be built independently, and literally rotated to adjust the flares between s4 and the mouth, as well as repoisition for testing purposes.

 

[JLH]

Ahhh... The beauty of altered states. 😀

 

[sine143]

Amen 😀

 

[DrDyna]

basically "dreamed" it up whilst trying to fall asleep, intoxicated, over independence day weekend.

Lmao! A lot of the best stuff is arrived at in this manner.

That really is a cool fold.

I wonder how it would work with two drivers facing each other?

Edit: That's what I get for not reading carefully, it seems like you're already using two drivers.

 

[sabaspeed521]

I like this design a lot, although if I were building for something in this size bracket I'd go with 4 SWS12D4 drivers as where I live they are 60-80 dollars each and the faital is 350. For less than 500 I could build a quad TH like the one below. It is not as power efficient at 1 watt but the 4 drivers together take 2000 watts rms. Attached image shows maximum output (2 pi) at 65 V into 4 parallel nominal 8 ohm drivers). 2.5 is the compression ratio.

The nice part is it's only 273 L and thus can be built in a 13 cu. ft. package (I use a 1.3:1 ratio to guestimate difference in built size versus internal modeled size)

 

[sine143]

Saba, can you post the hornresp inputs?

 

[tb46]

Hi sine143,

There is a fold here you may not have seen: http://www.diyaudio.com/forums/subwoofers/131852-live-sound-specific-tapped-horn-thread.html in Post #9 that is somewhat similar, it kind of combines your idea w/ the "standard" PA fold as in the Fury box (same thread).

Regards,

 

[sine143]

Oliver, thanks for the link!!!!!! Very interesting, will be sifting through it tmrw!

 

[sabaspeed521]

Saba, can you post the hornresp inputs?

Here you go, just realized that I simmed this with 4 10 inch drivers 🙂, still matches excursion and power limits because it's the same driver series. SWS10d4 as noted in the file.

Regards,
Will

 

[chrapladm]

Anymore progress lately?

I would have sent this and a few other questions in a PM but your inbox is full. 😀

 

[GM]

This sim is a dual loaded TH, loaded with Faital Pro 12 1030hps wired in series Pic attached shows input screen, 4v (1w into 16ohms sensitivity) schem diagram, and max spl in a stack of 8

but I would like to keep it under 425 liters.

I would GREATLY appreciate if we could keep driver suggestions to those that have 1000w AES or greater power handling, as I dont really want to exceed 1/2 AES rating by more than 20% to reach xmax, Woofer 8 Ohm[/url]


My initial estimates for dimensions was 30wx48dx21.5h external,

I realize CR is pretty high at about 4:1....

Hmm, coming a little late to this 'party' and seem to be missing something obvious as I get 145 dB/400 W ea./[8] stack from only ~196 L/dual driver/3:1 CR. The trade-off is it's not as flat or quite as extended in the extreme Hf [where it doesn't matter], though we all know it will be somewhat flatter in reality. Probably easier to fold too.

Also wondering why the series wiring since it's a ~2 ohm load, which will theoretically suffer more thermal power compression even at modest power than drivers in parallel, then series and/or parallel in stacks.

GM

 

[sine143]

Gm thanks for taking interest, refer to post 6 for some more info
http://www.diyaudio.com/forums/subwoofers/258055-large-format-dual-quad-12-30hz-th.html#post3972818