4th Order Port Size

[fyerbyrd22]

I know there's a thread on CACO about everything 4th orders but im not about to read through like 500 pages...im doing a 4th order wall for my teammate and i wanted to try my hand at designing it (never designed a 4th so bare with me)..built dozens but never designed...what size ports do you normally go with as a good starting point to begin testing? Ive heard between 1/4-1/2 cone area

8 Audio Legion S2512's

2 Audio Legion 5000D

i ran the EBP (92.96) on these and it looks like they are on high side and would like a 6th better but we're trying the 4th as that's what he wants..im told i shouldnt run into mechanical issues by this, but will possibly result in a peaky enclosure

any input from people with EXPERIENCE would be great...and NO, dropping down the amount of subs and going to a 6th, or changing subs, is NOT an option right now...if it fails, it fails and he upgrades...but we are trying this until that point

the design i came up with came out to about 2.4:1 ratio, just under 8cu sealed and 20cu ported, with around 480sq of port to start...it can be adjusted bigger or smaller as needed with 2x4

[imgur](http://i.imgur.com/SLdETX7.jpg)

[Triticum Agricolam]

You are probably better off for not reading that thread on CACO, there is more than a little misinformation there.

I agree with what other people told you, you shouldn't have mechanical issues, but the box will probably be quite peaky.

480 sq in of port area probably isn't a bad starting point. You could probably cut back to 400 if you needed, but I'd stay at 480 if you can.

As with any bandpass box, its a good idea to plan ahead for changing the length of the port to tweak the tuning for better performance.

[fyerbyrd22]

The whole port will be available..the picture I used was just where I think a good starting point will be...I'm gonna test peak without a port when I begin so that'll help some to understand what I'll need..but the whole ported section is available to change the port with 2x4

[fyerbyrd22]

bumpppp

[rocking.that.eclipse]

I've heard to start with half of cone area.

That's what I did and moved on from there(open up for more output, shrink for more lows, at least in my case)