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Any 12" Scoops on Here? |
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T-Bone 
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Joined: 27 December 2005 Location: Tampa, FL USA Status: Offline Points: 292 |
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 Topic: Any 12" Scoops on Here?Posted: 19 September 2013 at 12:37am |
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I plan on building 4 X Emerald subs loaded with PD 1850's, 35Hz- 75Hz then on top 2 X single loaded 12" Scoops from say 70Hz- 300-400Hz? Any suggestions this will be for a larger system I plan on building in the near future. Probably build some MT130 double loaded with 10" FaitalPro 10PR300.
 Thanks!
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BASS, how low can you go!
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b grade
Young Croc 
Joined: 05 October 2012 Location: Portland OR USA Status: Offline Points: 1337 |
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Posted: 19 September 2013 at 1:13am |
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Eminence scoop has a 12 version. I don't know how well it will suit your needs and I am sure the 18 is the best of the size variations, but it does have 12 inch dimensions provided.
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b grade
Young Croc
Joined: 05 October 2012 Location: Portland OR USA Status: Offline Points: 1337 |
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Posted: 19 September 2013 at 1:14am |
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http://www.dancetech.com/file-library/document/scoop_12_15_18.pdf
Edited by b grade - 19 September 2013 at 1:15am |
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fat_brstd
Old Croc 
Joined: 23 August 2008 Location: Melbourne, OZ Status: Offline Points: 2126 |
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Posted: 19 September 2013 at 6:17am |
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Dont build 12" scoops to go on top of 18" scoops. You would be much better off using a small voice coil & lightweight 15" cone in a reflex box to get from 75 upto 400hz. bear in mind thats more than 2 octaves your trying to cover and is pretty high to be crossing from a kick/upper bass box to a mid.
Scoops only real use is low sub notes due to their long horn length. When I started in sound we had a pair of 12" scoops and they did a surprisingly good job on sub under a pair of HD-15's. |
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Melbournes Rootical Warrior Roots - Dub - Steppers facebook page |
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T-Bone
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Joined: 27 December 2005 Location: Tampa, FL USA Status: Offline Points: 292 |
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Posted: 19 September 2013 at 8:07pm |
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fat_bstrd the Emeralds are half Bertha folded horn subs, will be loading them with PD1850's I have in original box. I know Mykey has modified version if he can chime in and share his plans would be great!!!
 Thanks!
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BASS, how low can you go!
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Ras Loud
Young Croc
Joined: 08 January 2012 Status: Offline Points: 754 |
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Posted: 20 September 2013 at 2:11am |
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Someone on here wrote a while ago about his attempt to build 12" scoops and did not like the result, because the horn did not work that well anymore in a smaller size. There seems to be more maths in scoop horn paths than just scaling up and down.
wilmslow-audio.co.uk have some kits on their website to build 12" rear loaded horns, actually scoops where the horn paths isn't round but quite angular. These are intended for home use though. In a soundsystem I wouldn't use anything else than reflex or usual horns on top of scoops. |
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RealitySound
Young Croc
Joined: 01 February 2011 Location: Bermuda Status: Offline Points: 1140 |
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Posted: 20 September 2013 at 2:22am |
"The phase at the rear of the speaker is shifted by pi which corresponds to 1/2 wavelength. At the frequency where the horns length is 1/2 wavelength the total shift is 2 pi or 1/1 wavelength, which is zero under steady state conditions. Down to the frequency where the horns length is 1/4 wavelength and up to the frequency where the horns length is 3/4 wavelength the sound from the speakers front and from the horns mouth will add to each other, below and above they will subtract from each other." Therefore if one runs a scoop with 7' horn (2.15m) - 160Hz , the good stuff is between 40hz (1/4 WL) and 120Hz (3/4 WL). If running a longer 8' horn (2.44m) - 141Hz, the "pass band" is 35hz to 105hz. |
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When you gonna send me some $$ mate ?
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Ras Loud wrote: