Small size superscoop

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   Hi,

To make this clear, I am totally noob when it comes to building speakers, but I always had the idea in the back of my mind to make one. So I came across this website and I hope you guys can help me out a bit.
I want to start off by building a superscoop. I have a 6" driver in good shape, but the plans I have seen, are only for 18" and 21". I want to build a smaller size, so when I screw up, it's not that expensive and I can break it apart to understand which mistakes I made. But my main question is; how can I convert the measurements for a 18" to the right measurements for a 6"? Is it as easy as dividing the measurements by 3 or is this more complex, since we're dealing with acoustics here. 
And also, is it best to use 18 mm thick plywood, or would you guys recommend less thicker plywood, since it's a smaller size...

I hope you guys can help me out.

Thanx in advance and cheers!

-Daniël

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Dani Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 07 August 2020 Status: Offline Points: 3	Post Options Post Reply Quote Dani Report Post Thanks(0) Quote Reply Topic: Small size superscoop Posted: 07 August 2020 at 7:30pm
	Hi, To make this clear, I am totally noob when it comes to building speakers, but I always had the idea in the back of my mind to make one. So I came across this website and I hope you guys can help me out a bit. I want to start off by building a superscoop. I have a 6" driver in good shape, but the plans I have seen, are only for 18" and 21". I want to build a smaller size, so when I screw up, it's not that expensive and I can break it apart to understand which mistakes I made. But my main question is; how can I convert the measurements for a 18" to the right measurements for a 6"? Is it as easy as dividing the measurements by 3 or is this more complex, since we're dealing with acoustics here. And also, is it best to use 18 mm thick plywood, or would you guys recommend less thicker plywood, since it's a smaller size... I hope you guys can help me out. Thanx in advance and cheers! -Daniël

dj jammin Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 10 April 2010 Location: southampton Status: Offline Points: 770	Post Options Post Reply Quote dj jammin Report Post Thanks(1) Quote Reply Posted: 07 August 2020 at 8:39pm
	Im no expert on this topic but its not as simple as just scaling down.. a 6 will not have the same ts parameters etc as a scoop driver.. i think some one said in another thread: make a transmission line box and make it look scoop like.. sounds a reasonable plan.. depends on what you want from it etc
	Reverence Sound system

valve head777 Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1781	Post Options Post Reply Quote valve head777 Report Post Thanks(0) Quote Reply Posted: 07 August 2020 at 8:47pm
	You're one of the best box builders I know Mr.... But, yeah difficult to scale down that far. Ps, yes I want the siren, and barracuda in tear down. I'm out never to return. Bye 😂😂😂😂😂😂😂👍👍👍
	Freedom of choice, choice of freedom.

mobiele eenheid Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568	Post Options Post Reply Quote mobiele eenheid Report Post Thanks(1) Quote Reply Posted: 07 August 2020 at 10:05pm
	As a start you have to keep the horn length the same, then you can decrease the surface areas throughout thew horn path. Surface area of a driver is a square function, so as a rule of thumb you would dived by (18/6)^2. A typical 6" has an Sd = 133 cm2, a typical 18" has an Sd = 1100 - 1250 cm2. For the SPL of a 6" I would use 9 mm, 7-ply Baltic birch as a minimum or 15 mm MDF.

Crashpc Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 26 February 2008 Location: Czech Republic Status: Offline Points: 465	Post Options Post Reply Quote Crashpc Report Post Thanks(0) Quote Reply Posted: 15 August 2020 at 8:25pm
	Things can differ a lot with small drivers and small bins. This deserves complete new development. Downsizing existing products will not get you anywhere. What is even your goal in the first place?
	Nikon and Canon people should not be married to each other. Why did you let this happen?

Dani Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 07 August 2020 Status: Offline Points: 3	Post Options Post Reply Quote Dani Report Post Thanks(0) Quote Reply Posted: 16 August 2020 at 10:32am
	My goal is to make a sub for in my room.

studio45 Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864	Post Options Post Reply Quote studio45 Report Post Thanks(0) Quote Reply Posted: 16 August 2020 at 1:15pm
	Right on, well that's easy - build the THAM6. It's a proper sub, with an interesting principle of operation (tapped horn, look it up) and it's designed for a 6" driver already. Your driver most likely won't be the recommended one for the design, but in my experience, tapped horns can wrangle surprisingly loud bass out of even the weakest of drivers.
	Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA

Crashpc Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 26 February 2008 Location: Czech Republic Status: Offline Points: 465	Post Options Post Reply Quote Crashpc Report Post Thanks(0) Quote Reply Posted: 16 August 2020 at 8:58pm
	This.... TH can dig a lot from very poor drivers.
	Nikon and Canon people should not be married to each other. Why did you let this happen?