Cheap 10inch woofer in tapped horn? what would you do? - Page 3 - diyAudio
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Old 4th January 2011, 10:54 PM   #21
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150dB is a pretty realistic aim for that much cone area.
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Old 4th January 2011, 11:18 PM   #22
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YouTube - 29082010017.mp4
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Old 5th January 2011, 01:42 AM   #23
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If you have 16 drivers, at 330cm sq, then your total cone area is 5280 cm sq, assuming the subs have ten mm linear excursion, then you will have a displacement of around 10 liters.

I have twelve inch drivers in my set up with a total displacement of around 17.8 liters, i don't need that much input power because of the cone area, around 1.2Kw total.

I don't get more then around 133db from my set up, my room is not that big, about 1900 cubic feet sealed, I do not think it is possible to get that spl from your subs.

As another poster said, that kind of spl is very bad for your hearing, i have slight ringing in my ears at night some times after watching a movie at high levels, trust me its extremely annoying! so i have reduced to volume at which i expose myself to.

Why not just use winISD to model a ported box, build four of them, each with 4 subs in, and put one in each corner, you will have more then enough SPL.

Finally the "hair tricks" your talking about are normally done with maybe 6 fifteens or four 18"s, from what i have seen, thats 30-40 liter of displacement being funneled out a car window, i don't think you achieve that at home.

Anyway, i look forward to your build, what ever enclosure you choose.
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Old 5th January 2011, 10:01 PM   #24
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hair tricks aren't as a result of air movement, they're as a result of sound pressure.

you didn't actually mention how many subs you have, or what enclosure they're in?
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Old 5th January 2011, 11:26 PM   #25
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I have 12 subs, in three enclosures, each around 350 liters net, two in corners, tuned to around 20Hz, and one in the center of the room, tuned to 15Hz.

Sound waves vibrate/compress the air, in my opinion, that is "moving" it.
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Old 6th January 2011, 06:54 AM   #26
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well there's your problem. Inefficient box design. I do believe your 12 12inch woofers are quieter than the two 12s i used to run in folded horns off less power
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Old 6th January 2011, 07:11 AM   #27
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Location: Toronto, ON, Canada
I doubt you'll be able to reach your goal unless you use a huge exponential.
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Old 6th January 2011, 11:40 AM   #28
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Well, first of all, i do not/ did not claim to have a problem, i am very happy with my system, i get a near flat frequency response all the way down to 10Hz in my room and can do reference level from around 15Hz upwards with very little distortion.

Efficiency is all relative, are my subs more efficient then a sealed aliment, yes, are they more efficient then a horn, no. I do not have the skill or knowledge to build horn subs or use horn response, so i went with ported, if some one wants to model a horn with a couple of JBL-GT5 12"s of a volume of around 400lt gross that would be interesting to compare to my design.

I doubt that two twelves, would be louder in any enclosure to be honest, but if they were, great!, I'm not overly concerned over max Spl, extremely loud spl is good for showing off, but for day to day its pointless and causes hearing damage, my system is 90% for movies/games and as long as i can do reference levels with out distortion i'm a happy camper!
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Old 6th January 2011, 09:16 PM   #29
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my 12's wouldn't have played anywhere near as low, as they weren't designed for it.
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Old 14th January 2011, 08:41 AM   #30
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Originally Posted by ThyDntWntMusic View Post
* Vas: 26.903
* Impedance: 4 ohm
* Qms (Mechanical Factor): 3.312
* Qes (Electrical Factor): 0.478
* Qts (Total Q-Factor): 0.418
* Fs (Resonance): 45Hz
measured specs of a brand new, straight out of the box driver are as follows:

vas: 33 litres
RE: 4.38 ohms
qms: 4.179
qes: 0.622
qts: 0.541
fs: 44Hz

in other words, the published specs are probably off the shelf measurements with no break in period, with obvious variation between woofers :P
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