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Old 11-20-2014, 05:05 AM
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Default Help designing 4th order for 6 Sundown SA 15's!

Hey guys last build was with 4 SA 15's and after trying to sell them the last 2 months with no takers I found a great deal on 2 more and now have 6 and want to do a full blown 4th order b pillar wall in my focus se wagon.
Heres the video of the last build https://www.youtube.com/watch?v=jZ1L...ature=youtu.be

New to 4th order designs I know the bare minimum about them any help as to how much sealed, ported, and tuning will be appreciated

I have roughly 65" Length, 42" Width, 30" Height give or take a little.

Due to low height unlike a SUV heres my idea on how I want to do the design
https://www.youtube.com/watch?v=uGQU83XuMUg

Basically just curious on the following
1.suggested sealed side
2.suggested ported side
3.does it matter if subs motors are firing into sealed box or ported box? cause I've seen them go both ways in 4ths.
4.How much sq in of port should I use and what should the port be tuned at? I hear its much higher then normal (28-32hrtz) even if you want to smash the lows I heard 40-50hrtz tuning is normal? but something with the sealed side is where the low freq comes from..?.?

Pretty confused any help guys?
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2005 Dodge Magnum RT
4 Sundown Audio SA 15's, 1 Sundown SAZ4500 @ 0.5OHM Daily, 8 fosgate mids/highs w/ fosgate 400-4 amp. 152.9db @ 44 hrtz, 149.6db @ 22 hrtz sealed up legal on dash! Box 14.5 cu ft tuned @ 30 hrtz.

Last edited by Racerkid15; 11-20-2014 at 05:45 AM.
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Old 11-20-2014, 01:23 PM
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1. Sealed side should be roughly 2 cubes per sub. If u build bigger u can always make it smaller if needed.
2.make Ported side as big as u can make it. Prly 2:1 or 3:1
3. Put motors in ported side so u can smell them lol
4. Build your enclosure without loading wall on it. Then seal it off then run a sweap and find your peak and tune loading wall to that. Most cases it's 43-49hz
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Old 11-20-2014, 09:32 PM
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Just to add to what Massive said, build as big as you possibly can. It's MUCH easier to shrink than it is to make it larger


You only have 37 cubes (1.5" thick all around) which is 6 cubes per driver so you're really limited on what you can do. I was going to recommend starting with 2.5 sealed and 6 ported per sub. Honestly, I'd just do 4 subs first with the size I mentioned first. If you're not satisfied after playing with the sealed and ported side, then throw a new baffle in for 2 more. Just design the setup so you can easily move the baffle forward or back to accommodate for the additional drivers
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Old 11-21-2014, 05:22 AM
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1.75 cu ft. Per SA-15 sealed with polyfill will be great I mean around 48-50hz so playing down to 25hz full tilt if not lower, if you want 48hz and below do 2cu ft. Per sealed with polyfill!

Good Luck, those drivers are 4th order bp BEASTS

Kindest Regards.
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Old 11-21-2014, 10:45 AM
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Thanks for the tips guys really appreciated So Most likely going to be able to do only a 2:1 ratio with the space I have but I'm still a little confused on how the sealed side works as far as the low frequencies (all I want really is 20-28 hrtz to be violent)

#1 So to pick up on the lower end I should make the sealed box bigger or smaller? 1.75 - 2.5 cu ft per?

#2 How much sq inches of port should the port of the ported chamber be? I read 15sq inches per cube roughly tuned near mid 40s as confirmed above (tuning wise)

I may have a little more space then mentioned I have to double check how much room the battery rack and amp rack will take up in the back of the car. will post pics later after I take seats back out of car again. thanks guys.
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Old 11-21-2014, 10:51 AM
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2.25cu ft. To 2.5cu ft. Sealed per, but keep in mind going bigger would reduce your mechanical handling limits so you would run into issues using high power!!!

Good Luck,

Kindest Regards.
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Old 11-21-2014, 02:26 PM
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so bigger sealed side = less power handling got that down. I only have 2 saz2500 v2s strapped @ .66 ohm each for all 6 so should be ok (800 rms each roughly). But still curious what determines the lows is it a smaller or bigger sealed box cause if it peaks at 40 hrtz thats fine I really just want a wind tunnel lol.
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4 Sundown Audio SA 15's, 1 Sundown SAZ4500 @ 0.5OHM Daily, 8 fosgate mids/highs w/ fosgate 400-4 amp. 152.9db @ 44 hrtz, 149.6db @ 22 hrtz sealed up legal on dash! Box 14.5 cu ft tuned @ 30 hrtz.
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Old 11-21-2014, 02:38 PM
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Quote:
Originally Posted by Racerkid15 View Post
so bigger sealed side = less power handling got that down. I only have 2 saz2500 v2s strapped @ .66 ohm each for all 6 so should be ok (800 rms each roughly). But still curious what determines the lows is it a smaller or bigger sealed box cause if it peaks at 40 hrtz thats fine I really just want a wind tunnel lol.
Bigger sealed will have lower sealed res, typically you can play an octave when tuning to sealed res,

Good Luck,

Kindest Regards.
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Old 11-21-2014, 03:14 PM
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Ah ok ok very good starting to get it lol. Now I tried to mock something up for all 6 15s and it doesn't seem to be working out. I actually have a little less space then I thought cause at 28" the hatch/roof curves in so I on the safe side have these... 55"D (save 10" in back hatch for batts/amps) 27"H, 42"Wide all safely.. so closer to 30cu ft... gonna most likely just build a solid 2.5:1 or so 4th for the 4 15s and it'll probably be better then stuffing 6 in too small of an enclosure.
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2005 Dodge Magnum RT
4 Sundown Audio SA 15's, 1 Sundown SAZ4500 @ 0.5OHM Daily, 8 fosgate mids/highs w/ fosgate 400-4 amp. 152.9db @ 44 hrtz, 149.6db @ 22 hrtz sealed up legal on dash! Box 14.5 cu ft tuned @ 30 hrtz.
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  #10  
Old 11-21-2014, 03:22 PM
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Quote:
Originally Posted by Racerkid15 View Post
Ah ok ok very good starting to get it lol. Now I tried to mock something up for all 6 15s and it doesn't seem to be working out. I actually have a little less space then I thought cause at 28" the hatch/roof curves in so I on the safe side have these... 55"D (save 10" in back hatch for batts/amps) 27"H, 42"Wide all safely.. so closer to 30cu ft... gonna most likely just build a solid 2.5:1 or so 4th for the 4 15s and it'll probably be better then stuffing 6 in too small of an enclosure.
Hmmmm, why don't you use something like the Zv4 or NSv3 so they don't need a huge sealed side, I mean 1.5 cu ft. Per!

Good Luck,

Kindest Regards.
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