Opinion on Vented Enlcosure

I'm about to build a vented enclosure with 2 infinity 1030w 10's. I've messed around with winISD for quite a few days now and I've come up with this in WinISD:

Tune the port\box to 35Hz(my choice)
2 - 3 X 8 inch diameter ports
It takes 3 cubic feet Internal volume plus the woofers area and the ports area
I get a mach of 0.05

I'm using 3/4" mdf, the speakers will be mounted in the front symmetrically with the 2 ports in between the speakers.

Does anyone see any problems with this? Maybe a suggestion? I also wanted to check on the port area that I need to add to the overall internal volume. Do I count it as a solid piece insice the box or just the thickness of the tube?

Sorry if I've forgot obvious info for my setup.

- Kyle

Is this calculation of 3 cuft PER woofer or for both in the same volume?  Count the volume of the port as if it was a solid mass.

it's for both woofers. no partitions inside and also with the same shared ports

Add some kind of center brace to the box, it can be drilled out to allow for air flow between the two chambers, the idea behind the brace is to keep the large surfaces from flexing and resonating.

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Top Secret, I can tell you but then my wife will kill me.

I'll probably put in 2 braces on each side of the ports spread out evenly. now what about wall braces, would this be like running a 1" X 2" piece of wood around the middle of the box connnecting all of the sides?

- Kyle

Here is my 2 cents, i would build seperate chambers for each sub and possibly tune a shade higher to 38 hz, you shouldnt notice it drastically in your super lows but your mid low's and typical beats will be a bit higher you might get about 3-4db out of this, and independant vents per sub.

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place

Jeff,

I was kinda wondering about the tuning maybe was a little low. I noticed I get more output the higher I go.

Why do you reccomend seperate chambers over a single? Is there less chance of screwing something up?

- Kyle

So that if you have a sub failure you can still use the other, and the added strength of a center divider in the box to keep the box from flexing. Jeff is bang on with the rise of the tuning frequency as well, solid info.

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Top Secret, I can tell you but then my wife will kill me.

So if I split the two subs into thier own chambers then....
...in winISD I should just design it for a single 10 tuned to 38Hz and then make that same box twice for the single dual enclosure? and also taking into account the divider will add .75" to the hieght of the box?

- Kyle

You got it!

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Top Secret, I can tell you but then my wife will kill me.

sorry, this is these are the last questions I have before I build it this weekend.

Does the 3/4" of wood the ports go through count as the total port length specified in winISD or should I add 3/4" to the port lenghth?

Should I add the 3/4" of area the port runs through the wood to calcualte it's total displacement?

Polyfiber? Do I really need it? what gestimate should I make for adding to the internal volume of the box?

Thanks.

- Kyle

Yes the length in the wood counts as port length. No do not calculate it in as displacement. Ignore polyfill for now, there is something better...... build the box first, see how it sounds.

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Top Secret, I can tell you but then my wife will kill me.

So I just calculated(in WinISD) the 2 10's in a single volume and the 2 tens in their own volumes(sepereated with a barrier). The only difference was that the mach for the single volume was .04 and the mach for the 2 volumes was .08. I still don't see a big advantage of seperating the 2 woofers and I'd assume a lower mach is better to go with.

I plan on bracing the box even with a single volume so dividing the volumes isn't a big deal to me.

- Kyle