Needing help designing a box.

[Christian Murace]

I need help from any person good with boxes willing to just give me abit of assistance . Me or anyone I know can't use winISD if our life depended on it , I need a box that is used for home cinema I do not mind the shape, colour, look (rectangle would be preferred and guess that's easiest to do) for a sealed enclosure suitable for a JL Audio 15W0v3-4, a box that just goes down to 20hz is good , looking at around 1.8 cubic feet for optimum off sonic electronix but 2 feet is still ok if that's easer, I dunno do home cinemas need to be done differently ? Thank you to anyone willing to help many ++++++ and good karma

[ckeeler11]

Sealed enclosures do not have tuning. So do you want a ported box tuned to 20 hz or a sealed box?

[ckeeler11]

Doesn't get any easier than this;

http://www.parts-express.com/denovo-audio-knock-down-mdf-30-cu-ft-subwoofer-cabinet-for-dayton-audio-15-reference-seri--300-7078

[Christian Murace]

Sealed enclosures do not have tuning. So do you want a ported box tuned to 20 hz or a sealed box?

I would go ported but I feel I would fail building one , I just wanted a sealed that was able to go down to 20hz but maybe if I pick up my inspiration I can build a ported

[Christian Murace]

Doesn't get any easier than this;

http://www.parts-express.com/denovo-audio-knock-down-mdf-30-cu-ft-subwoofer-cabinet-for-dayton-audio-15-reference-seri--300-7078

I would happily buy that in half a second , but I should've mentioned I live in Australia , it's sort of do it yourself or forget about it thing over here

[Christian Murace]

And shipping would be like 500$ if it did ship that is

[Triticum Agricolam]

I would go ported but I feel I would fail building one , I just wanted a sealed that was able to go down to 20hz but maybe if I pick up my inspiration I can build a ported

Getting good output at 20 hz out of a single sealed sub is going to be a tall order. A ported box will significantly increase your low frequency output.

[Christian Murace]

I would go ported but I feel I would fail building one , I just wanted a sealed that was able to go down to 20hz but maybe if I pick up my inspiration I can build a ported

Getting good output at 20 hz out of a single sealed sub is going to be a tall order. A ported box will significantly increase your low frequency output.

thanks triticum , always help from you and very true

[Triticum Agricolam]

Here is a graph comparing the output between sealed and ported boxes:

The blue line is a 2 cu ft sealed box and the green line is a 3 cu ft ported box tuned to 22 Hz.

The ported box beats the sealed box pretty handily below 60 Hz, below 30 Hz it has 5-6 dB more output, which is quite significant. Its larger though.

If you have the room you can get even better performance by using a larger ported box, the orange line is a 6 cu ft box tuned to 22 hz. It would work really well, but your power handling will be reduced somewhat.