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Scaling the HWK for 18" (Read 11992 times)
morpheous85
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Scaling the HWK for 18"
09/12/07 at 21:14:33
 
I know this has been asked on here many times, but it seems the old threads are gone.  :'( Also, I just bought the new plans, which have no specific info on scaling. Is it that you multiply everything by 1.2? (15 x 1.2 = 18)

Jason
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asiquis
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Re: Scaling the HWK for 18"
Reply #1 - 09/12/07 at 23:22:02
 
send me an email I have what you are asking

better not to post the numbers

Ray
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morpheous85
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Re: Scaling the HWK for 18"
Reply #2 - 09/13/07 at 15:32:50
 
How about a PM? My e-mail is unreliable at times.

Jason
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FlipC
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Re: Scaling the HWK for 18"
Reply #3 - 09/17/07 at 10:00:41
 
I'm interested in this also (PM'd but no repsonse)

Now my drivers are so old I can't find specs
for them and am to lazy to test them to find out. Since I'm scaling up to 18's I decided to use the drivers current cabinets (Cerwin Vega B36) rear chamber size (cubic feet) and adjust the center chamber to be close to that. Plus I have to take into account the width of the drivers which will change the width and depth of the over all design. Which since the B-26 cabs (these are THE OG ones) are 4.583 cubic feet I came up with 16x22x22 = 4.482 cubic feet.
Using Jason's idea of designx1.2 we get:
15.6x22.2x22.2 = 4.45 cubic feet center chamber
19.2x22.2x22.2 =  5.476 cubic feet top/bottom chamber

So that proves it is logical.
Though if you have your speakers specs you should use something like WinISD to model your driver in a single 4th order enclosure and double it. This doesn't take into account the off phase top port though.
(About to create a new post about that)


How about some input from the old plans
on how they say to go about scaling.


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asiquis
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Posts: 61
Re: Scaling the HWK for 18"
Reply #4 - 09/20/07 at 03:43:14
 
Flip

I PM'd you, but you have not opened the file yet according to my outbox....... Huh

Ray
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FlipC
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Re: Scaling the HWK for 18"
Reply #5 - 09/21/07 at 07:21:16
 
Thanks for replying.
I already cut wood though. Ended up going with my original plan of using the B-36 enclosure volume as a base. Which makes the overall OD 57x33.5.  My 2 lower ports will be 4" but are tunable with adjustable length. The top is a 6x6. It is going to be relocated due to end usage of cabinet.  (PA)  

All in all my numbers roughly match the ones you sent
and also morpheous85 formula so I am pretty confident it will turn out well.

I start on it today.
Will be taking pics and psot at end.
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jearhart
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Re: Scaling the HWK for 18"
Reply #6 - 09/26/07 at 19:15:35
 
asiquis wrote on 09/12/07 at 23:22:02:
send me an email I have what you are asking

better not to post the numbers

Ray

could i get that also?
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masseysmusic
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Re: Scaling the HWK for 18"
Reply #7 - 02/10/08 at 13:49:30
 
I too am going to scale my hwk for 18" also any advice in using these cabinets in a large portable P.A. would be greatly appreciated.

Thanks ahead of time.

Rick
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Audiogasm
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Re: Scaling the HWK for 18"
Reply #8 - 08/09/08 at 18:47:03
 
I also need to scale for an 18 but can't pm until I make 5 posts
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Audiogasm
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Re: Scaling the HWK for 18"
Reply #9 - 08/09/08 at 18:47:26
 
hmmmm
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Audiogasm
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Re: Scaling the HWK for 18"
Reply #10 - 08/09/08 at 18:48:13
 
I'm ready to go get wood for this next week
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Audiogasm
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Re: Scaling the HWK for 18"
Reply #11 - 08/09/08 at 18:48:48
 
and now I can pm
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doctor_zivago
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Re: Scaling the HWK for 18"
Reply #12 - 09/12/08 at 12:12:21
 
I also want to scaling the HWK for 18" !
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doctor_zivago
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Re: Scaling the HWK for 18"
Reply #13 - 09/13/08 at 02:35:42
 
I also want to scaling the HWK for 18" !
this is 2 nd post
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doctor_zivago
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Re: Scaling the HWK for 18"
Reply #14 - 09/13/08 at 02:38:45
 
I also want to scaling the HWK for 18" !
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