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Scaling the HWK for 18" (Read 12441 times)
doctor_zivago
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Re: Scaling the HWK for 18"
Reply #15 - 09/13/08 at 03:01:42
 
I also want to scaling the HWK for 18" !
I can PM now!
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kaney16
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Re: Scaling the HWK for 18"
Reply #16 - 08/30/10 at 03:27:10
 
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kaney16
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Re: Scaling the HWK for 18"
Reply #17 - 08/30/10 at 03:27:36
 
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kaney16
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Re: Scaling the HWK for 18"
Reply #18 - 08/30/10 at 03:28:02
 
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kaney16
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Re: Scaling the HWK for 18"
Reply #19 - 08/30/10 at 03:28:29
 
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kaney16
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Re: Scaling the HWK for 18"
Reply #20 - 08/30/10 at 03:28:53
 
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gildcm
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Re: Scaling the HWK for 18"
Reply #21 - 08/30/10 at 16:34:21
 
If you are looking for the measurements to scale the HWK to 18's, I'm sure Steve still has the measurements. I have them but because they are Steve's plans he has to give the ok to share with you if you have purchased the plans. That is why I say ask Steve for the measurements to scale the HWK.
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kaney16
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Re: Scaling the HWK for 18"
Reply #22 - 09/13/10 at 09:04:54
 
aight so u do times dimensions by 1.2 but do u do that with the ports also?
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DirtDawg
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Re: Scaling the HWK for 18"
Reply #23 - 09/14/10 at 16:31:28
 



I would say that I do not remember that anyone has tried your specific driver, but that is the beauty of this type of enclosure, especially in the way Steve has designed it.

Most drivers with a strong motor assembly will do OK.  

Build it, test it, report back.


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« Last Edit: 09/15/10 at 03:27:02 by DirtDawg »  
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ArchmasterDragon
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Re: Scaling the HWK for 18"
Reply #24 - 01/23/12 at 07:28:36
 
Greetings!
I just bought HWK15 plans and I was planning to use 18" drivers, also what could be a good way to load the HWK ? In the info it says the ultimate way to load is using 4 drivers, but even good results are promised with only 1x15" driver.

How much the design can forgive in the dimensions ? I have to change the imperial measures to metric, because the local wood shop have cnc-machines that only accept metric input.

Thank you in advance
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ZYGI
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Re: Scaling the HWK for 18"
Reply #25 - 01/24/12 at 01:25:49
 
I've scaled it these two ways, and liked the second version better than the first.....

First way is to multiply the width depth and height by 1.2 keeping the port sizes the same as the 15" version.

Second way was to multiply just the width and depth by 1.2 and keep the original height, and ports the same is the 15" version. But this would all make a difference as to what driver you are using.

Then convert it to MM and cut away....

Zygi
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« Last Edit: 01/24/12 at 01:26:40 by ZYGI »  

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ArchmasterDragon
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Re: Scaling the HWK for 18"
Reply #26 - 01/24/12 at 01:35:08
 
Great, thank you for the tip. I was thinking that maybe I would use IST UXL-18" driver. I kinda thought that you need every dimension multiplied by 1.2, although rarely any subwoofer box can be modified like this, because everything affects everything, like driver, dimensions, are you using wool inside a box, how long reflex pipes are etc..

I think I'll follow the advice and do the second. Also what can you say about how many drivers would be "ok", I mean that is overkill even with 1x18" driver, but what is your opinion. 1,2 or 4 drivers in same box. the isobaric configuration drops the sensitivity by -3db per pair, so 2x isobaric means -6db lower sensitivity, I hope I wrote this correctly.

Thanks
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ZYGI
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Re: Scaling the HWK for 18"
Reply #27 - 01/24/12 at 12:31:30
 
Yes, you wrote it correctly.

We tried a set of Dayton 15's, they worked best with one driver mounted on each of the internal baffles, clam shelled facing each other. We also used some McCauley 15's which worked best clam shelled on the baffle closest to the two 4" ports which gave a hump in response, at exactly where we wanted the hump.

So I guess simply put, if you want to go isobaric, you will have to find what is right for the drivers and what you are looking for.

Zygi
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ArchmasterDragon
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Re: Scaling the HWK for 18"
Reply #28 - 01/24/12 at 13:15:43
 
Thanks for the tip. I'm just searching for a powerful and low bass with good punch, I have made a subwoofer with normal enclosure and even it goes to 30Hz, but I still feel lack of good kick. I was thinking how the 4 drivers affect the overall performance, because even though there are 4 drivers pumping air, but it's not a guarantee that it would work better than with 1 driver.
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« Last Edit: 01/24/12 at 13:16:35 by ArchmasterDragon »  
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ArchmasterDragon
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Re: Scaling the HWK for 18"
Reply #29 - 01/27/12 at 11:44:45
 
I forgot to ask about the material thickness when scaling the HWK for 18", do you use the 3/4" material or do you multiply that also with 1.2 or just use 1" thick material. I think there is going to be more pressure in the box with the 18" drivers that is capable moving larger volume of air than with 15"? What would you recommend for suitable construction material, I was thinking to use MDF, because it's more dense and less prone to resonate?

Thanks
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