1 port or 2?
#1
1 port or 2?
Hey guys, i'm going to build my first enclosure in the next few weeks sometime and need some opinions. The box is for 3 Oz Matrix 250L D6, i used winisd and it says the optimum box is 6.1 cu ft tuned to 30.5hz, The box I have planned is 38" x 18.5" x 18.5" which works out to a net internal volume of around 5.9 cu ft.
I want to tune it to 31hz and my options are one long slot port running the length of the box 36.5" x 1" and 4" long, or 2 shorter slots on either side of the box 17" x 1" and 10" long.
Making the box with one port would be easier, but i'm not sure if there are adavantages or disadvantages to either.
So should I use one port or two and is there anything else I am not taking into consideration?
This is for a daily bumping set up, I want good sq but I need it to get loud as well.
I want to tune it to 31hz and my options are one long slot port running the length of the box 36.5" x 1" and 4" long, or 2 shorter slots on either side of the box 17" x 1" and 10" long.
Making the box with one port would be easier, but i'm not sure if there are adavantages or disadvantages to either.
So should I use one port or two and is there anything else I am not taking into consideration?
This is for a daily bumping set up, I want good sq but I need it to get loud as well.
#2
From what I've read the general rule of thumb is not to go over a 9:1 ratio with width and height or else you get a lot of port noise.
If my math's right, the single port will tune your box to about 43 Hz and the double one to about 34 Hz. The lower you tune, the longer the port has to be if you keep the same cross section area.
As for one port or two, I can't help you there. I've only dealt with one myself.
If my math's right, the single port will tune your box to about 43 Hz and the double one to about 34 Hz. The lower you tune, the longer the port has to be if you keep the same cross section area.
As for one port or two, I can't help you there. I've only dealt with one myself.
#4
http://www.jlaudio.com/tutorials/ports/index.html
Don't have a calculator for it, but I use the equation on this page here. Takes a while longer to figure out, but it works.
Don't have a calculator for it, but I use the equation on this page here. Takes a while longer to figure out, but it works.
#9
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Posts: n/a
^ Dood - that slot depth is way long - it tunes the box to ~21.5hz. Good for whale calling I suppose [img]tongue.gif[/img]
OK, since one side is 17", how about we use that for the height. If we make the opening 2.5" wide, then the depth of the vent is 13.5" to tune 5.9cuft to ~31hz.
OK, since one side is 17", how about we use that for the height. If we make the opening 2.5" wide, then the depth of the vent is 13.5" to tune 5.9cuft to ~31hz.