15" Kick Scoop Idea??

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   Just been browsing the Scoop forum, getting envious of all the guys with their "premier league" 18" Scoops. I am particularly interested in the HOG scoop. Due to its re thought design.

I know that many people have trouble getting a great kick box to go on top of their 18" Scoops and thought about what a great Kick I remember 15" Scoops to have...

So I've come up with this - never designed a proper speaker in my life before - so it may be sh*t. But I really want some comments!

Just popped into my head lol. May make some dimensions up and build a pair just for the crack. 

What do the more experienced guys think? Would it work?

- Joe.

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SmokeyJoe Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 22 August 2006 Location: United Kingdom Status: Offline Points: 536	Post Options Post Reply Quote SmokeyJoe Report Post Thanks(0) Quote Reply Topic: 15" Kick Scoop Idea?? Posted: 18 January 2008 at 12:34pm
	Just been browsing the Scoop forum, getting envious of all the guys with their "premier league" 18" Scoops. I am particularly interested in the HOG scoop. Due to its re thought design. I know that many people have trouble getting a great kick box to go on top of their 18" Scoops and thought about what a great Kick I remember 15" Scoops to have... So I've come up with this - never designed a proper speaker in my life before - so it may be sh*t. But I really want some comments! Just popped into my head lol. May make some dimensions up and build a pair just for the crack. What do the more experienced guys think? Would it work? - Joe.

josh Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 03 December 2006 Status: Offline Points: 682	Post Options Post Reply Quote josh Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 12:38pm
	yes it will work its just like anyother scoop, you have to be more calculated than drawing it on paint though, your going to need to simulate it on the computer and come up with some real dimentions, weather it will kick or not is another matter, scoops have phase issuses where sound from the driver is in or out of phase with sound comeing from the horn depending on the fequency being played so you could find you have a dip in the response around the 80-100hz area like most scoops do and thus no kick

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11851	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 12:47pm
	One of the problems you might encounter is the phase cancellation between the direct radiation and the scoop popping up in the range you want to use. You'll also need a small rear chamber I think.

SmokeyJoe Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 22 August 2006 Location: United Kingdom Status: Offline Points: 536	Post Options Post Reply Quote SmokeyJoe Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 1:22pm
	Ah, I forgot about the phase cancellation thing with Scoops. Seems it may not work in the right range then... I may continue to tweak the design into a build-able cab - and then do an mdf prototype. And I first drew it up by hand, on paper. I just used paint to get it on the forums - thats no where near a plan - I only had the idea 30 mins ago! - Joe.

Jake_Fielder Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 08 October 2007 Status: Offline Points: 4236	Post Options Post Reply Quote Jake_Fielder Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 1:26pm
	but as the horn path is much smaller, wont the cancelation happen at a higher frequency than you'll be playing them?

Jake_Fielder Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 08 October 2007 Status: Offline Points: 4236	Post Options Post Reply Quote Jake_Fielder Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 1:27pm
	100Hz is 343cm so if the horn was 170cm it'd be perfectly in phaze at 100Hz, am i right?

tommysb Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 24 April 2006 Location: Finland Status: Offline Points: 1036	Post Options Post Reply Quote tommysb Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 2:13pm
	You also have to consider where the scoop mouth is smaller than the wavelength produced it acts like a transmission line, and the wave reflects back down the scoop. You have the 180degree phase shift since it comes out the back compared to the direct radiator. You when have 1/4 wave going down the scoop, another 1/4 reflecting back (so in total a 1/2 wavelength phase shift). THis 1/2 wavelength shift is for the '180degree' shifted radiation, so now, you have it in phase. The ammount of 'refelection' back up the scoop is frequency dependant. But the point is at some frequencies you're gonna get interference and others destruction. I don't know if this is expressed very well, sorry!

Static Age Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 November 2005 Location: Oxfordshire Status: Offline Points: 1652	Post Options Post Reply Quote Static Age Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 2:28pm
	i agree with the above points. smokeyjoe, also take into consideration the size of this potential cabinet for your proposed aplication. scoops are pretty large cabinets, using a scoop sized cab above them for kick bins means even more big boxes to have to carry/ transport. i think if i were to go for a kick bin above my scoops it would have to be nice & compact like the HD15 for example.


SmokeyJoe Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 22 August 2006 Location: United Kingdom Status: Offline Points: 536	Post Options Post Reply Quote SmokeyJoe Report Post Thanks(0) Quote Reply Posted: 18 January 2008 at 2:58pm
	Well, it is intended to run 70~140Hz. Its not by any means a long horn, and wouldn't be that much bigger than a HD15. It would be as wide as a Scoop and not very tall. Designed to stack on top of a vertical row of Scoops. Does anyone know of any FREE MAC-FRIENDLY software I could use to model this? And, its only for fun - nothing serious. I just hope its loud . Thanks, Joe.