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any designs that use a 21'' and gets 145db?

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Dre collier View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dre collier Quote  Post ReplyReply Direct Link To This Post Topic: any designs that use a 21'' and gets 145db?
    Posted: 20 February 2008 at 4:37am
Hey guys I'm new to the forum. But I know alot about speakers and how to use them and their correct form. well anyway I was wondering if anybody knew any designs on a subwoofer that reach an output of 145 peak, I heard of bassmaxx and others doing this. I been thinking of using a 21'' from 18sound or beyma. but don't wanna do front loaded or scoop or bandpass. Please help!!!!!!!
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mykey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2008 at 5:16am
you'd be looking at these type of dimensions I rekon
 
 
 
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Dre collier View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dre collier Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2008 at 5:26am
I look at that before but don't know the horn design. would you know what it is?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H.. Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2008 at 9:29am
Just call FK1 i'm sure their give out the design ....................................... NOT!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TONY.A.S.S. Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2008 at 9:25pm
I guess the horn design on the f1 cabs hasn't really departed from the original Turbosound designs. There maybe cosmetic changes to the outside but in principal I would be surprised if they differed that much. Unless anyone knows anything different.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tb_mike Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2008 at 11:01pm
No.Compare the horn mouth area,with a 21" speaker,the speaker is far smaller.It cant move enough air.

working backwards
145dB at 1metre
145 - 30dB(~1kw) = 115dB sensitivity 1watt 1metre

Note the sensitivity of typical 18 and 21" speakers,they are near 99dB at 100hz.At 50hz,its usually lower.

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Dre collier View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dre collier Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2008 at 12:01am

but here in the US we dont have PD. All I can use is Beyma and 18sound 21's. so I'm leaning towards a basic folded horn design wit a 21'' most likely 18sound. Anyone ever done a folded horn design wit a 21''?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tb_mike Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2008 at 7:30am
Originally posted by Dre collier Dre collier wrote:

but here in the US we dont have PD. All I can use is Beyma and 18sound 21's. so I'm leaning towards a basic folded horn design wit a 21'' most likely 18sound. Anyone ever done a folded horn design wit a 21''?


Well 18sound is just as good.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2008 at 12:09pm
There is often a huge price premium on 21" drivers over 18".  It can often work out better just to use two 18" rather than one 21".
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jethrocker Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2008 at 3:45pm
Or wouldn't 2x 15" give you about the same SD as 1 x 21"...?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2008 at 4:09pm
tbh i dont see any point in 21s other than " mines bigger" but they must die easily???
cant imagine a 21" being very efficient at all???
2x15 would be more sensible,
145db is going to require a horn im sure, and a 21" loaded horn is just going to rip itself apart within 5 minute surely???
there are turbo 21" band pass horn plans about but i cant seem to see the point with them to be honest, a 21" wont have much kick and wont be as effective at going low as a similar priced stack of 18s....
If you want people to feel the bass then a reflex design is probably best as you get the most air movement per decibel from those.      errrrr yes wtf?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2008 at 4:12pm
Hi Dre, 21" woofers are rated from 800 watts to 1000 watts AES ( a good real world rating) ( the 18sound is rated at 1500 watts but if you read the fine print it is in the 750-800 AES range). This would allow up to aprox. 135 dB at full power at 1/m in a large folded horn bin. To get to 145 dB with one woofer would mean close to 4000 watts. Your woofer would have a short life. Four 21" in large horn bins in a stack could reach 145 dB. The way to reach extreme spl is with the use of a lot of bins.  Rog had posted photos of about 20 bins he used for a show about year ago. He stated he got strong response down to below 20Hz with super high output. This is the way to go.  VECTORDJ / VECTORSONICS   
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