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My new Scoop design |
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Tom Umney 
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Joined: 26 February 2004 Location: United Kingdom Status: Offline Points: 4954 |
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 Posted: 25 February 2006 at 9:24pm |
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LOL anyone who uses scoops above 150hz must be mad. 400hz out of scoops would sound like sh*t. 18 inch scoops are fine for dub,reggae and dnb. And 4 will do from about 40hz- 150hz.
Edited by ToXiC - 25 February 2006 at 9:24pm |
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mykey
Old Croc 
Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Posted: 26 February 2006 at 6:48am |
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ill be crossing them over at 80. a sigle 15 x-tro will go above |
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Phil B
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Joined: 21 November 2004 Location: Melbourne Status: Offline Points: 2328 |
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Posted: 26 February 2006 at 7:59am |
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We always crossed ours at 80hz low pass and 35hz high pass....?
"Curves look pretty but below 200 Hz they really don't do anything.".....whatever... .p. |
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Joe Jones
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Joined: 08 June 2005 Location: United States Status: Offline Points: 63 |
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Posted: 26 February 2006 at 9:48am |
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"ill be crossing them over at 80" ????? The point of a scoop is to use the midbass from the front wave, and you're not going to use it. From the same size box you could use smaller drivers in a spiral horn and get another octave of LF extension. "Curves look pretty but below 200 Hz they really don't do anything.".....whatever..." Subs built to exactly the same design save for using flat versus rounded reflectors show no significant difference in response below 200Hz. Wavelengths in excess of five feet don't need 'assistance' in negotiating the bends of a horn. All smooth curves and constant flare rates makes for very nice advertising copy but they have no sonic benefit in subs. Totally different story in midbasses, though. |
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Contour
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Joined: 03 March 2004 Status: Offline Points: 624 |
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Posted: 26 February 2006 at 10:58am |
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Hello Jones, Very strange, every time I read a post by you it reminds me of a Bill Fitzmaurice post. Same use of language and so on. But I assume you are not the same person. Best regards, Walt |
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Phil B
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Joined: 21 November 2004 Location: Melbourne Status: Offline Points: 2328 |
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Posted: 26 February 2006 at 11:22am |
I was thinking the same..? And I`d love the math on the rough versus smooth..not saying your right or wrong ...proof please.. .p. |
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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: 26 February 2006 at 5:47pm |
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Bill fitz talker or not,the fact is true. see JLH audio measurement on smooth vs 45* reflector corners. Hes posted alot on audioasylum regarding this.
consider a 8metre long 40hz wave,with a 1/4wavelength of 2metres. Just as a elephant stands on an ant,an 8metre long wave doesnt care if the curve is flared or not. |
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minaximal
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Joined: 26 September 2004 Location: United Kingdom Status: Offline Points: 1780 |
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Posted: 26 February 2006 at 7:52pm |
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what about fluid dynamics. thats precisely why the geiger spreadsheet compensates for acoustic flow around smooth folds.
also most folded bass horns have well over 90* bends without reflectors, and play up to 100hz which is 3.4m or 85cm 1/4 wavelength which could possibly be modulated by a 42.5cm pathlength variation 1/8th wavelength, quite conceivable with larger cabinets. |
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LostGrayCat
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Joined: 22 August 2005 Location: United States Status: Offline Points: 1053 |
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Posted: 26 February 2006 at 9:14pm |
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Think I've seen this design somewhere
 just for a different kind of bottom end
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djstefanos
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Joined: 18 November 2005 Status: Offline Points: 2355 |
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Posted: 26 February 2006 at 10:22pm |
 no offence, looks like a toilet
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mykey
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Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Posted: 26 February 2006 at 11:07pm |
 just spat my coffee out
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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: 27 February 2006 at 5:45am |
Yes it certainly does. The question is it audible? Does a nicely folded horn that one has taken all this effort to fold so well,actually operate any higher? 42cm pathlength variation,i dont see how that would occur in a typical S or spiral basshorn. Cheers. |
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Contour wrote: