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any designs that use a 21'' and gets 145db? |
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BenW8C 
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Joined: 28 February 2019 Location: Netherlands Status: Offline Points: 15 |
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 Topic: any designs that use a 21'' and gets 145db?Posted: 12 June 2019 at 10:35am |
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I'm aware of the fact that this threat is more than 10 years old, but I'm really curious about the difference you are talking about between F221 and TSW721. I'm trying to find either of them, how do you like both?
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tb_mike
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Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744 |
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Posted: 22 February 2008 at 8:19am |
Yeh the bassmaxx goes loud.It was measured at a sub shoot out,but it didnt go low. B&C 18sound all similar good quality. You can get 'super woofers'but they are expensive and are usually used for car audio/ extreme home theatre |
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SteveAATW
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Joined: 04 September 2007 Status: Offline Points: 1173 |
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Posted: 22 February 2008 at 3:10am |
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The F221 works well and is earth shatteringly loud, but only because of the driver I suspect and you can't buy them - dual voice coil, custom OEM job and without the neo magnets the cab would be virtually unmoveable. It's a very different sound to the TSW-721's of old. If you tried to copy the design with an off the shelf 21 I suspect the loading would rip the driver to bits quite quickly.
Upper bass is good from them but there are limits to how fast it can go obviously and I'd be inclined to have a few twin 18's or twin 15's on top of them as well |
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Dre collier
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Posted: 22 February 2008 at 2:51am |
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Okay I see wat you guys are saying but wat if I wanted to do something like bassmaxx's deuce, it reaches 145 peak!! but again he is using B&C 12''' is there any better 12''s than B&C???? |
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PRIMETIME
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mobiele eenheid
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Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Posted: 21 February 2008 at 4:17pm |
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Yes 2x15", 2x18" is more like a 24", talking Sd.
Aiming at something like ~104 dB/W/m @ 100 Hz (1/2 space) would be far more realistic.
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VECTORDJ
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Posted: 21 February 2008 at 4:12pm |
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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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Mark James
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Posted: 21 February 2008 at 4:09pm |
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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.... |
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me so horny me love you long throw
horn loaded for her pleasure |
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jethrocker
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Joined: 07 June 2006 Location: Chiapas, Mexico Status: Offline Points: 1942 |
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Posted: 21 February 2008 at 3:45pm |
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Or wouldn't 2x 15" give you about the same SD as 1 x 21"...?
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ceharden
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Posted: 21 February 2008 at 12:09pm |
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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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tb_mike
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Posted: 21 February 2008 at 7:30am |
Well 18sound is just as good. |
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Dre collier
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Posted: 21 February 2008 at 12:01am |
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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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PRIMETIME
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tb_mike
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Posted: 20 February 2008 at 11:01pm |
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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 wrote: