4th order box help

[cherojeep96]

i need help on finishing touches on my box and any help would be appreciate

the box will have two SA-12s in it and 1inch thick all the way around

will try add pictures as soon as possible

the airspace for the sealed side is 1.041

and the airspace for the ported side is 3.317

if you need more information ill try my best to get is to you

[cherojeep96]

dont even know how to add pictures lol

[islandpride684]

dont even know how to add pictures lol

Google free pic host, add pic, upload it, then copy image link, paste here

[cherojeep96]

http://i61.tinypic.com/2u90jya.jpg

http://i61.tinypic.com/dylsgw.png

http://i59.tinypic.com/25khloo.png

hope them links work

[philrab]

http://i61.tinypic.com/2u90jya.jpg

http://i61.tinypic.com/dylsgw.png

http://i59.tinypic.com/25khloo.png

hope them links work

Next time, use the IMG tags to embed the pics, makes it a little easier on our end viewing them.

Am I seeing that correctly, your sealed chamber is towards the front of your pics, ported to the back? What questions do you have? What is your tuning freq, and what are your goals with this bandpass?

[cherojeep96]

http://i61.tinypic.com/2u90jya.jpg

http://i61.tinypic.com/dylsgw.png

http://i59.tinypic.com/25khloo.png

hope them links work

Next time, use the IMG tags to embed the pics, makes it a little easier on our end viewing them.

Am I seeing that correctly, your sealed chamber is towards the front of your pics, ported to the back? What questions do you have? What is your tuning freq, and what are your goals with this bandpass?

yes the sealed chamber is to the front my tuning is at 32-35 i dont remeber exactly i was just wondering if that looked right to be a 3:1 ratio

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[cherojeep96]

and it is 18 inches high with the top

[cherojeep96]

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[philrab]

yes the sealed chamber is to the front my tuning is at 32-35 i dont remeber exactly i was just wondering if that looked right to be a 3:1 ratio

I'm no expert on 4th order bandpasses (that's my next project for the experience, have a spare sub to try it with) but everything I've read is that the ported section is tuned for higher notes. The net airspace of the sealed chamber dictates the low notes, ported section is typically tuned higher in the 40+ range. Somewhere around here there's a really good thread regarding 4th bandpass design.

Have you run these specs through WinISD or anything to have a look at what frequencies this thing will play at?

[cherojeep96]

i might change to port tune it to 40 but i might just go with this and see how it goes