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My new Scoop design

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mykey View Drop Down
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    Posted: 22 February 2006 at 12:22am

My new 18'' Scoop design!

comment's please?

please excuse the messy drawing



Edited by mykey - 22 February 2006 at 12:34am
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Joe Grime View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe Grime Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 4:18am

It will never catch on

Steve

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 7:04am
Just needs to be trapezoid as well to eliminate any parallel walls and you'll have a practically unbuildable cab!

I can see what you're trying to do but since scoops have issues going up in frequency, making it all nice and smooth is probably unnecessary.  Nice idea tho.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bartsegers Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 12:19pm

why retry an already desigend cab?

in my eyes scoops are completely dead-designed

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matthias Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 2:43pm

hey mykey,

thats what i thought of, too. the round corners only can make the sound better, but i dont know if the triangle section is needed. bracing is important too. im not an expert, but the difficult way of rogs design isnt for fun i think. so i will read this topic carefully

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Post Options Post Options   Thanks (0) Thanks(0)   Quote freddyi Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 2:46pm
shouldn't lowpass function be "better" than attempting wideband rear wave augmentation? - just curious - what would the smooth curve do to summed response?

btw - here's Bill Woods' mini scoop vs JBL C40

http://gallery.audioasylum.com/cgi/gi.mpl?u=21168&f=UPWA RD.gif


Edited by freddyi - 22 February 2006 at 2:53pm
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Jay Lawless View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay Lawless Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 2:54pm
last i heard a smooth curve would give more of smooth roll off on the bass end making it a nice pleasent sound. while straighter angel gives a hard kick. but thats dealing with the horn mouth. the curve is great when trying to get precise sounds, but i personaly go for the straight, gota love the kick.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote minaximal Quote  Post ReplyReply Direct Link To This Post Posted: 22 February 2006 at 3:36pm
Originally posted by NeverWinter NeverWinter wrote:

while straighter angel gives a hard kick. 


straight angles act as a band pass, smooth curves will lessen this affect.

straight sections are conical approximations of ideal flare rate and thus will have a more peaky non linear response.    much as i love curves i would think, it may create even more cancellations than a normal scoop around 80-100hz as freddyi pointed.

@mykey whats your goal, done any tests yet? is this a new xxl offering?
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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: 23 February 2006 at 2:58am
Originally posted by bartsegers bartsegers wrote:

why retry an already desigend cab?

in my eyes scoops are completely dead-designed

who has? can i see any pic's?

thanks for your comment's guy's most appreciated

the cab is pretty easy to build actualy.. all the curves are mostly one piece and are made on pneumatic jig's and i use a 30 second 2 part glue

@mykey whats your goal, done any tests yet? is this a new xxl offering?


there is still a big market for the scoop bin's in the Reggae seen, and there are so many different versions on the market just trying to improve on the ones that are already out there.

Testing them next week up against my old design, ill let you know guy's

Thank's again



Edited by mykey - 23 February 2006 at 3:28am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bartsegers Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2006 at 11:27am

improvement is the idee. I thought you were re-inventing a scoop.

no comments then.

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Phil B View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2006 at 2:35pm
Well....if you made it trapezoid it`d be petty close to these...

CMC Matrix scoops

Which were designed and built by NCA. They use the " no hard corners " philosophy on all their bins and the scoops were no exception. All smooth curves and constant flare rates ...blah blah...loaded pd1850`s ..etc etc
Anyway CMC sold `em on ....seen some of them about at carnival last year.

Looks like the driver is right up to the rear chamber divide..? So a smaller rear chamb` and longer horn length..? Should be " smoother " than most scoops anyway!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe Jones Quote  Post ReplyReply Direct Link To This Post Posted: 25 February 2006 at 10:14am
Curves look pretty but below 200 Hz they really don't do anything. Scoops are a dead issue in any event. The dispersion of the large woofer limits its usefulness to perhaps 400 Hz, and the rear horn is too short to go below 60 hz or so. That's far too narrow a bandwith to justify such a large box, especially in the bass. Something this size shouldn't need to be paired with a sub.
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