SUBWOOFER BOX CALCULATOR - TUNING, VOLUME, PORT, ETC.
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- Опубликовано: 22 май 2020
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Авто/Мото
Very cool. Ill be trying this out for my dual 4" dayton mini build. Thanks
According to other box programs I use such as re audio box calculator and winisd, you have to subtract the port volume away from the net as well so to be accurate with using the12volt, so pretty much you have to work backwards, you have to already know the volume of the box you want to build and play with the dimensions to get the correct net volume. For example I designed a 13w7 ported box with the12volt and I entered the dimensions in first that I thought would fit in my trunk, I figured out the net volume without port displacement as you did in the video which was the whole inside of the box minus sub displacement and it gave me a port length of 26in tuned at 34hz, so after I used re box calculator which is easier to understand because it shows a 3D model of your box and entered in the exact same dimensions minus the sub displacement and it said my box was tuned to 39hz, winisd also said the same thing. So the first step is actually knowing the airspace of the box you want to build, then use the12volt port length calculator and then add port displacement to the airspace that you figured out in the first step and add both to get the gross internal volume and then play with the dimensions to match that. For example the way you did it was as follows: I want a 3 cubic foot box with a 3 inch wide by 14 tall port tuned to 34hz, the12volt says I need a port length of 31.5 inches so it says I need 24wide 15.5high and 18deep box for 3 cubic feet but there actually isnt 3 cubic feet of airspace, the way I did it (which is spot on correct according to re box calculator, winisd and any other programs Ive tried) is to like I said start with already knowing your airspace, which I want 3 cubic feet and I will use the same port width and height tuned to 34hz, so now I have to add the sub displacement as well as the port displacement which is 14.5x3.75(not 3 because of the L port inside the box with a .75 thickness added to 3)x 31.5 = .99 cubes so I have to play with the dimensions in the volume calculator until it says 3.99 cubic ft instead of 3 because 3 cubic feet is how much air is actually inside the box you have to take away port displacement as well, it is very confusing and it took me months to correctly figure it out! Thats the correct way to do it according to winisd, speakerbox lite, re audio bc calculator and bassbox.
So my actual dimensions to get the 3.99 cubic ft gross internal volume would be about 31wide x 15.5high x 18deep to have an actual net airspace of 3 cubic ft tuned to 34hz with a 3 inch wide port 31.5 inches long.
Agreed, though could be shorter.
--Basically, there are 2 approaches: A. Know the box volume needed and B. don't know the box volume.
If using winISD, and you don't know the size of box, it will calculate the best volume, port, etc. Then, you need to figure out the port displacement and woofer displacement and subtract that from the original volume. Problem is that winISD isn't really set up like this. That's why most people talk about adding the port and sub displacement to the box volume.
--So use winISD or other program to find the best volume+port, or sealed, and then add the port+sub displacement, and then build a box to that final dimension. For me, I also use winISD speakerboxlite etc. and know what size box I have available to use, then subtract 20%-30% of that volume away for port+sub displacement, and then plug that final volume into the program to prevent errors.
Just use sub box pro and be done it configured everything already
This was the issue,exactly wat you said.you have to take in account for port displacement too and deduct that from your net.Once you've done all deductions then you can play with port length....
If you calculate for a square port then cut the square in a diagonal that will give the size of the triangle but I don’t know if it changes the length
Not gunna lie, of all the box calculators I've used, this is one of the harder ones to understand because you have to have a lot of the box information before the box is built and it doesn't even give you cutout information for each panel.
Nice bro
--I'm no expert, but...
--What do you mean that the baffle is the wood thickness? The baffle is what the loudspeaker attaches to in order to, hopefully, stop rear waves and front waves from canceling each other out. The baffle can be varying thickness, different materials, etc. Building a box includes the baffle specs because any given sub might need a minimal sized baffle, etc.
--Double baffle means 2. It could be 2 1/2" baffles or 2 0.75" baffles = 1.5", which is the standard, but thicker could be better.
--good manufacturers will specify minimal baffle thickness recommended.
--Also, the baffle could be of different material than the rest of the box walls.
---You put 1.5" as wood thickness and then calculated your volume using that, which means every board in the box is 1.5" thick. That's why your crap is wrong. You calculate everything out and then add the 2nd baffle on top of the first one, thus not changing the inside dimensions and only very minimally, insignificantly changing the sub internal displacement. A 12"X12"X12" box is 1ft³, calculated with a thickness of 0. If I add in my board thickness of 0.75", then the volume drops to 0.66992'³ (-0.331'³ loss d/t wood thickness ft³). If I change my board thickness to 1.5", then the volume drops to 0.41288'³ (-0.58712'³).
--Take a standard 0.75" board, make a 12"X12"X12" box and determine internal volume = 0.66992'³. To check this: 1 - 0.66992 = 0.331'³ loss d/t wood. To check this: [(12*12*0.75)/(1728)] *2 + [10.5*10.5*0.75)/(1728)] *2 + [10.5*12*0.75)/(1728)] * 2 = 0.3299'³, which is pretty close to the 0.331'³ loss that was calculated, and if round up 0.3299'³ becomes 0.330'³. I wouldn't say that this math is a waste of time because if you can do the math than you must understand the operation.
Thanks bro for this really apreciate it
Your welcome thanks for watching and subscribing.
Where did you get the 5 inch port from? You did this box based off of box you have built already. Do you have a video on “finding out” what your port length will be etc. I’m trying to figure out how to build a box from scratch. Not on an existing box. Thank you.
I thought the measurement we put is the innir part? Or let see width is 40 then subtract the board thickness used(.75) so instead 40 it become 48.50”? Am imright sir? Or wrong?
Thanks helped me alooot
Your welcome thanks for subscribing!
Hi Jacob, i have a parallel 6th order bandpass on 2 pioneer 12, 1 to 1 ratio 4 cubic feets per side, tuned to 30 and 40 hertz, im thinking on sealing one of the ports and make it a 4th order just to see how it sounds different, my question is, should i sealed the 40 hertz port or the 30 hertz port and why?
The lower tuned port most likely so you have better bandwidth unless your going for more lows. Also depends on cubic space and goals.
The other question sir? Is what if i use the cicular port? Then the gevin port lenght is 10”…. The question is i need two port. Is it still 10”? Or devide into 2? So become 5” per port? Or the two circular ports the same measurments to 10”????????"
Hi Jacob. How should i think if i Wanna build a sub box with a port in the middle and Using two subs. Thx
Cubic space dirt usually and port area and outside limitations.
In the 12volt website
When calculating port length
Does it ask for overall box volume or the net volume after Displacements
Net usually if it doesn’t clarify displacements. Best to remove those from number
Okay so net internal volume not including port displacement correct
Hi, I just watched your video and I’m still confused never built a box before.
I have two 12in CVX subs I want to build or have a ported/ vented box built. The max width 12, max height 15-15.5. How long does my box have to be and how wide should the port be? If you can help it’ll be greatly appreciated.
The cubic space determines that last factor for length. You plug into a calculator to get your cube goal. The port area is by height and then Width can be based off cone area and cubic space. 14-16sq in per cubic foot.
Is this a leget site sir? The 12v? I have this one. But i stil dont know whait is the right tuned i want. What hz tune box is like crawling in the ground? 35-38hz? Or 40hz? Or what? Thanks sir jacob
You need to tune lower like 32-36hz
None of the online calculators makes sense, they say from 4" to over 100" for 25hz tuning of 8' box for a single SI HT-18v3 using a SINGLE 4" port. That can't be right. I have 4" ports, 8 cubic feet box, how many of those ports and how long should they be for 25hz? I joined a couple sites and they only give more weird formulas instead of an answer.
So two 4” aeroports at 12-13” length or three 4” aero ports at 28-30” length? I definitely would go with 2 ports but may lack high end. You want to account for overall area in determining tuning.
İ have a question that İ can't find any other place. what is the measurment to find out how cubic litre box needed to the exact speaker?
Imagine I have a speaker and I do not know its parameters. How I can find out what the size of box for that speaker should be?
I'll be very glad if somebody answer this ot send a link. highly appreciated.
Manufacturing specs will be provided on their manual of the speaker or on the site usually 90% of time. Also general guidelines on forums to follow.
New in this box building I just built a box for a 12inch sub but don't know how many Hz or how to tune it what can i do or need to do
How do I know to run speaker invert or normal
Look at your subwoofer motor disc placement and net cubes, if not enough space in box invert, or too much then mount regular.
Can you do one for 2 x15 v2 4th order blow through ?
I don’t design boxes sorry. I suggest 3.5cubes sealed net, 8+ported with subs in ported section.
@@JacobViral2 okay so what have u seen or heard what kind of wood do you recommend for 2 x15 4th order blow through MDF or birch?
@@Elchriss7. video on ruclips.net/video/o1MaHHs4xdY/видео.html birch
what is sealed cube space 2.5 means?
It means 2 and half cubes of box space in the sealed chamber of box where subs in.
How would I do a box for 4 10
depends on the goals and what your doing.
bro you have to be a math guinise for this video
with all due respect can you make a sketch for me with a single 12 "vented box ported slot with a size of 2.25 ft3 + port displacement 3 × 12.5 "port, 20.5" long Thank you very much
Need lot more info than your giving. Gonna need max dimensions, amps you will be running, and subwoofer model. Without that it is impossible to tell how your box will perform, in saying that you are currently tuned into the upper 30s but who knows where you are when you actually put the sub in. Ask on a forum like www.stevemeadedesigns.com/board/ in the subwoofer enclosure section.