Port area arguement

[kr15 5,000+ posts]

4" is way too small for that driver on that power

 

[THATpurpleKUSH 5,000+ posts]

7-11 sq inches of port area per cubic foot is what I like to stick to.

I would go with a 6 inch aero, 4 would give too much noise.

 

[bgaff45]

4" is way too small for that driver on that power

exactly. It'd sound like absolute ****. Could it also damage the sub?

 

[bgaff45]

7-11 sq inches of port area per cubic foot is what I like to stick to.
I would go with a 6 inch aero, 4 would give too much noise.

Thanks man. I appreciate it!

 

[Hertz Mafia]

3cubed box after displacement with a 6" port tuned to 30hz should work.. 4" is to small for sure.

 

[Jeffdachef 5,000+ posts]

Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

port area is calculated on tuning frequency and displacment. nothing ELSE.

garbage calculator man.

 

[Jeffdachef 5,000+ posts]

FYI. you do realize that having more port area means MORE displacement and MORE output correct? its kinda like say i have a 15 with a 12" passive radiator.

no i dont. I gained a lot of dbs from shrinking my port area while retaining the tuning with my old box. There's always a limit to how much port area would actually give performance. You dont want the biggest port area, you want the proper amount port area. big difference.

 

[Papermaker85 5,000+ posts]

garbage calculator man.

people are just too stupid to understand how a ported box really works. The issue with the calculator is instead of using a moderen day drivers SD it uses a much higher SD( like late 90 cone area figures and when they ask for x max it's for the highest possible displacement because it wants to give you a vent match and the lowest possible resistance without killing the dampening.

The stupid **** about 9 - 16 square inches per cube is complete and utter ******** there's no science behind it

 

[Papermaker85 5,000+ posts]

no i dont. I gained a lot of dbs from shrinking my port area while retaining the tuning with my old box. There's always a limit to how much port area would actually give performance. You dont want the biggest port area, you want the proper amount port area. big difference.

You still dont grasp how a ported box works.

 

[Papermaker85 5,000+ posts]

how does any of this actually help, your calculator is still useless for the most part

The boxes tuning frequency is the port's resonance frequency. if you go one octave above that and look at the excursion plot you use that number to get your "xmax" figure.( when you block the driver with the power you going to use in the box and tune you're going to use)

There's only two things that determine the proper Port area it's tuning frequency and displacement of the driver displacement being in that box with the amount of power you put into it not necessarily x max they put x max because it's a maximum linear limit of the driver you guys really are slow.

 

[Jeffdachef 5,000+ posts]

You still dont grasp how a ported box works.

all i know is from experimentation and real world results goes against what that calculator recommends completely. Litteraly the difference between 143 db with what that caculator recommended yes thats the exact port area it recommended to 154db by shrinking.

 

[wew lad 5,000+ posts]

You guys really are slow.

so you just now mention power?

 

[Papermaker85 5,000+ posts]

so you just now mention power?

If you're too stupid to understand that power moves the driver you're retarded. the point is it's all about displacement and tuning frequency if you put X Max like they suggest that's the maximum possible displacement. In other words its the largest port You'll Ever Need.

I have 75in^2 in 4 cubes and get alittle nose at and around tuning.

 

[Papermaker85 5,000+ posts]

all i know is from experimentation and real world results goes against what that calculator recommends completely. Litteraly the difference between 143 db with what that caculator recommended yes thats the exact port area it recommended to 154db by shrinking.

User error and lack of understanding.

 

[Jeffdachef 5,000+ posts]

User error and lack of understanding.

no, it means the calc is garbage lmao. Even according to winisd the port area recommended was way closer to what i experimented with rather than that stupid calc that does not factor in TS specs nor power.