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  #1  
Old 09-28-2011, 10:45 PM
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Default 6th order wall ratio question

Going to be redoing my 4th order into a 6th and am just trying to figure everything out. Using 6 18" IA death penalties on about 2k a piece and planned on having the rear chamber around 27 cubes giving each sub 4.5 cubes. That leaves the front to be about half of that 13 cubes. Does having a larger rear ratio mean it will have a wider bandwidth but not be as efficient as if the front was double the rear. I'm not concerned with numbers but rather a low end daily ground pounder that moves some air.

Also I know the rear port area needs to be quite small and I've heard around 5 square inches of port per cube of airspace. So if my rear chamber is 27 cubes I was thinking like 150" in the rear tuned to 29-30ish hz.
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Old 09-28-2011, 11:16 PM
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i would also like to know! can someone make a box design that would peak at 38 hz and be like safaribass's box?
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Old 09-29-2011, 01:30 AM
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Originally Posted by deanmachine View Post
i would also like to know! can someone make a box design that would peak at 38 hz and be like safaribass's box?
If I remember right safari is running a 1.7 to 1 ratio with the front chamber being larger. I think he has like 20 cubes in the rear with 100" of port area. I'm trying to figure out how it would be opposite of his, with a larger rear chamber.
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Old 09-29-2011, 08:51 AM
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Posting on my ipod so this ishort. Youdont have rnough space. Mqke the rear chamber a little smaller. In any case in a wall and a 6th order you shouldnt need a ssf for awhile unless extreme amounts of power.
Front chamber size doesnt affect bandwidth in 6th orders quite like it does with fourths. Its a balance of tuning, chamber sizes, port area.. Another note, ideally you want to have as much front chamber port area as yoj do cone area.


Edit. Rear chamber port area being small is genericaly correct. I wouldnt go that small though..
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Old 09-29-2011, 09:10 AM
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Quote:
Originally Posted by surreal View Post
Posting on my ipod so this ishort. Youdont have rnough space. Mqke the rear chamber a little smaller. In any case in a wall and a 6th order you shouldnt need a ssf for awhile unless extreme amounts of power.
Front chamber size doesnt affect bandwidth in 6th orders quite like it does with fourths. Its a balance of tuning, chamber sizes, port area.. Another note, ideally you want to have as much front chamber port area as yoj do cone area.


Edit. Rear chamber port area being small is genericaly correct. I wouldnt go that small though..
How much for a design of a 6th order?
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Old 09-29-2011, 09:11 AM
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I do 6-8 sq per cube in the rear chamber
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Old 09-29-2011, 09:25 AM
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You do not have enough air space to properly design a 6th order for 6 18" drivers. Maybe 4 but thats pushing it.
When you start adding filters it becomes more and more complicated as well as requiring a large amount of room to accomidate a proper design.

I woud either go with less drivers or think of a different design.
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Old 09-29-2011, 09:36 AM
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Sadly im not taking further design requests as i will be opening an online store here shortly
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Old 09-29-2011, 09:54 AM
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46 panel, I suggest getting T/S parameters before trying a 6th order. I know IA doesn't publish T/S specs but if you took two subs that look identical but have vastly different T/S specs, and built a perfect 6th order to the specs of one, the other would not perform well.

You are talking about a lot of material and time. I hope you don't waste it by building a box that isn't truly designed for your subs.

With 40cuft of space, you do have enough space for 6 18s.
[if i understood your post correctly, you can do 27cu ft rear and 13 cu ft front.]


-----------------------------------------------------------------------
4th order is fair game though. they are very forgiving and easier because you have no rear ports to worry about. And you can turn off your subsonic filter because the sealed portion doesn't lose acoustic control of the woofer.

Last edited by iamsonic; 09-29-2011 at 10:22 AM.
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Old 09-29-2011, 10:19 AM
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While I agree with most everything Sonic said. I dis-agree on the use of 6 18's being ok for 40ft3. In my research I have found that the ratio of front to rear chamber is 1-1.5:1. For an 18" driver I would go with at least 8-10ft3 per driver on the rear chamber and 10-13ft3 on the front chamber. The ports act as filters giving you your pass band. 6th orders tend to be primarily used in sub freq. setups and thus require alot of room. Generally 6th orders have tunings in the 10-15hz range with a HP cut off in the 40-50hz range.

I would steer more towards a 4th order with the amount of subs and space avalible.

But thats just my .02
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