Finding subwoofer displacement

[mar424 10+ year member]

Hey,

This will be the 3rd box I am building. All of the ones I have built have been ported and I never had a problem finding the subwoofer displacement.

I have a 2008 Kicker 12" L5 and I can't seem to find out the displacement of it. I want to build the box to 2.5 cu ft @ 33 hz. I know I have to take the 2.5 cu ft and add the displacement of the port and sub.

Also, what is the advantage of using a round port over a slot port? The first box I built used a round port and seemed to hit harder and more to my liking that the slot port. Is it just preference?

Click to read more...

 

[WildSebring 10+ year member]

I've built a few boxes...and I seem to like the 4" Aero's a lot. You lose your port area, but I love the wa y the Aero's sound. A Slot port will still sound nice, but like you said...it's all personal opinions and preference.

I'm working on trying to attain high scores(153-154) with 2 4" Aero's and a single sub at the moment.. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The L5's displacement is not listed on Kickers website?

 

[mar424 10+ year member]

The L5's displacement is not listed on Kickers website?

I did not see it, but it may very well be there. I only saw fs, qts and vas

And there site does not want to load for me right now, figures.

 

[Innovative:Cory 10+ year member]

Forumla to calculate speaker displacement:

4x0.33x3.14xthe distance from the back of the mounting lip to the rear of the magnet ^3x0.5x0.6, that will give you the cubic inches...you then divide by 1728 for cubic foot displacement

.

So for example if you have a distance of 5" from the back of the mounting lip to the rear of the magnet it would be....

4x0.33x3.14x5^3x0.5x0.6

4x0.33x3.14x125x0.5x0.6

1.32x3.14x125x0.5x0.6

4.1448x125x0.5x0.6

518.1x0.5x0.6

259.05x0.6=

155.43 cubic inches or .089 cu ft of displacement...

 

[mar424 10+ year member]

Alright thanks, I just plugged in the numbers and got .228 cu ft

The mounting depth for the L5 is 6 13/16 and I am pretty sure I did the math right.

Thanks for that formula

 

[z0n3d0u7 10+ year member]

The displacment should be in the manual. Atleast i believe thats where i found it when i had my L7's.

.228 sounds kinda big. Iirc, I believe my L7's displacment was around .14cuft^3.. thats been months tho and i could be wrong.

Ive got plans for a 3.0cuft tuned to 32hz somwhere around here if you need / want them. Dont know how well an L5 would do in 3cuft tho.

 

[mar424 10+ year member]

hmm, maybe i did the math wrong lol.

i'll re-read the manual and try that formula again when i get home from work

 

[Anniku989 10+ year member]

Make a cubic foot box, fill with water, drop the speaker in, take it out, and see how much is left, subtract.

right? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[mar424 10+ year member]

I was able to find it on Kicker's site like you said, it wasn't under where I thought it would be!

Turns out the displacement is 131.1 cu. in. which equals .076 cu ft.

Thanks for the help