PDA

View Full Version : 4th Order Design



cyn
07-25-2012, 12:08 AM
Okay who wants to design a 4th order for me.. would like to have the design by friday..

1 Sub = Re Audio 12" HC 03 model
1 Amp = AQ1200.1 wired at 1ohm

car: 07 Imapla LT - seats don't fold down
space to use: 36W x 14D x 16H

Want a lot of air movement... but I want it to be non-peaky

audio141
07-25-2012, 12:26 AM
its easy, do a 2:1 ratio which means for every 1 cubic foor sealed you would do 2 ported then tune the ported section to 40-50 hz

for your sub i would do 1 cube sealed 2 cubes ported at 45 hz, use re box calculator to make the ported section or the12volt.com

audio141
07-25-2012, 12:28 AM
also bandpass designs have a pretty wide band width

---------- Post added at 12:28 AM ---------- Previous post was at 12:28 AM ----------

tune it to 42 for a lower response and more air movement :)

cyn
07-25-2012, 12:32 AM
Ummm... I would never use RE Calculator... and there is a lot more into designing a 4th than a 2 to 1 ratio...
I know how to use Bass Box Pro and WinISD... just would like someone that does this all the time and can get more detailed in the design than I can with everything else

audio141
07-25-2012, 12:34 AM
like what, you got to be more specific

cyn
07-25-2012, 12:40 AM
More control of the sub... more control over the freq. etc.. etc.. etc...

audio141
07-25-2012, 12:42 AM
i only know the basics so i couldnt help you there, i would like to find out aswell

duanebro
07-25-2012, 12:54 AM
Do you have the t/s specs for the sub?

cyn
07-25-2012, 12:59 AM
Do you have the t/s specs for the sub?

http://www.caraudio.com/forums/subwoofers/550991-re-audio-2003-subwoofer-specs.html

cyn
07-25-2012, 01:07 AM
displacement is .2 cubes btw

Chriszle
07-25-2012, 01:22 AM
Why not hit up one of the box designers on the forum. Not every sub will perform well in a 4th order. The Fs looks fine, but the qts is rather low for a 4th order. That sub will probably perform better in a ported or 6th order.

cyn
07-25-2012, 01:26 AM
Why not hit up one of the box designers on the forum. Not every sub will perform well in a 4th order. The Fs looks fine, but the qts is rather low for a 4th order. That sub will probably perform better in a ported or 6th order.

Well Buck was designing the box for me till he got sick... and most everyone else usually takes a week or more to do a design

Chriszle
07-25-2012, 01:33 AM
From my understanding, drivers that work well in 4th orders have a lower Fs (which your sub has) as well as a qts of .5 or higher. I would maybe ask for a 6th order design, or just go with a regular ported.

audio141
07-25-2012, 01:34 AM
whats a good qts for a 4th order?

Chriszle
07-25-2012, 01:39 AM
As stated above .50 or higher for qts. You can also use the drivers EBP, which is Fs/Qes. I believe if EBP is less than 70 go 4th order and greater than 70 go 6th order, but not positive on that.

cyn
07-25-2012, 01:48 AM
As stated above .50 or higher for qts. You can also use the drivers EBP, which is Fs/Qes. I believe if EBP is less than 70 go 4th order and greater than 70 go 6th order, but not positive on that.

For a 6th order how would you tune the inside port... higher or lower than the outside port? Say I want to hit from 20-60hz would I do a 35-40 inside 40-50 outside or?

Chriszle
07-25-2012, 01:52 AM
I am not an expert designer. I would go ask Hackmunch on caco. He is a bandpass guru.

hispls
07-25-2012, 02:37 AM
Not all subs perform well in bandpass. I can say from my experience, provided you know what your vehicle accoustics add and take away from response, winISD is quite accurate predicted vs. measured response.

T3mpest
07-25-2012, 01:53 PM
Not all subs perform well in bandpass. I can say from my experience, provided you know what your vehicle accoustics add and take away from response, winISD is quite accurate predicted vs. measured response.

With bandpass enclosures as well? I've never really used WINISD for bandpass before.. As another few posters mentioned though, the RE HC 12 really doesn't lend itself very well to a 4th order alignment. 4th order subs tend to be higher Q and lower fs as the rear of the driver is sealed, so unless your driver plays loud and low in a sealed box, it won't do much better in a 4th order. Anyway, PWK does very good bandpass designs if your looking for some semblance of SQ in your design.. IMO, he'd be the way to go for you even though the designs are somewhat expensive, he really does do a good job. If you tell him you want good air movement with a flat response he can build something to suit your needs. He is quick too as long as you do rush status, less than a week from start to finish IME.

cyn
07-25-2012, 08:46 PM
With bandpass enclosures as well? I've never really used WINISD for bandpass before.. As another few posters mentioned though, the RE HC 12 really doesn't lend itself very well to a 4th order alignment. 4th order subs tend to be higher Q and lower fs as the rear of the driver is sealed, so unless your driver plays loud and low in a sealed box, it won't do much better in a 4th order. Anyway, PWK does very good bandpass designs if your looking for some semblance of SQ in your design.. IMO, he'd be the way to go for you even though the designs are somewhat expensive, he really does do a good job. If you tell him you want good air movement with a flat response he can build something to suit your needs. He is quick too as long as you do rush status, less than a week from start to finish IME.

Might do that later..... Think i'm just going to design myself a nice big ported box and see what I can get moving in through the rear deck blow through...
And I'm also changing this 12 into a 15 with upgraded parts and so forth so the specs will change when I do that.



Thanks Everyone for the help

Flastrongman
07-25-2012, 09:08 PM
I can design 4th and 6th orders with a musical response.

Blue Fury
07-25-2012, 09:16 PM
Go 6th or go home

cyn
07-25-2012, 09:24 PM
well then someone design me up a freaking 6th order for this bish... I'll try it out hell... why not... one of the few I haven't tried yet...
I want it to murder lows for sure