This is the second video in a series I am working on. The goal is to provide some easy visuals that hopefully will make port tuning a little easier to understand. Check out video #1 here: th-cam.com/video/-yopTneS7g8/w-d-xo.html
these videos help me a lot.. now i understand that i need double size box for 2 subwoofers.. i have 1X 12” subwoofer but im going to buy a second one so i need a big box… thanks a lot brother. my single 12” box is tuned to 29hz with a 30cm long 3” aeroport. im pretty new to this port tuning thing.. i had many sealed boxes before
Awesome! I'll be sure to share that tip the next time that I make a video on chuffing. Sometimes the slightest little round over can make a huge difference.
@@DIYAudioGuy yeah it really can I was disappointed and I saw some of your little tricks, so I took my Dremel for the sanding bit and rounded the inside edges of the triangle ports and man it's so much better it's actually beating the shit out of the inside of my car now LOL
1:35 viewer reminder if/when actually designing an enclosure: we need to remember to consider driver displacement also being doubled will decrease volume more so than with having only one sub. But this was irrelevant in this example which is for our sake, keeping it simple, thankfully.
I am swapping out my sealed box for a ported one but its for a bit of a show truck and I want the ports to be symmetrical. It is for a 12' sub that requires 1.38 cubic feet and the port is 12.5" x 1" and 16" long. Can I do two ports 6.25" x1" and still 16" long to get the same frequency? Thank you!
You never brought up the port end correction. When modeling with WIN ISD do you cut down the port length do to the radiated mass? The equation is Sqrt [4x port area /3.14] = you take this number and multiply by .732 This will give you your actual physical port length. This is the equation that takes your physical port and figures out what your actual acoustical port length is I would like to hear what you think about this! Thank you and great video!
Port length and tuning stays the same when add multiple woofers as long as u double the math or tripple depending on how many woofers u have for air space...1 box for 1 sub with 1 port tuned to say 35 hz will be the same length u use no matter how many woofers u had...as long as airspace and port area are doubled..tripled..ect...very easy concept to understand
When using WinISD, I design a box for tuning H, and volume V, and I select to have 2 ports. WinISD then calculates a port length. Do I build each of my two ports to be 1/2 of the Vent Length that WinISD is displaying in the Vents tab? Thank you.
If I'm ok with chuffing noise is there any disadvantage of having thinner ports? My box manufacturer gave pair 3" PVC ports to reduce the cost with 6" lenght to each port. Box net volume is 4 cubic feet. Now I have lots of port noise but its not audible when I'm loud due to mid highs. So am I lossing efficiency due to small ports forced to travel pressurized air?
Can't wait for a laptop, to actually design a build in 3D. Then print it out, I've been drawing my designs by hand with a square and graph paper. Not always to the mm or ft on the sheet but comes out right it's just the cuts I need to perfect..And learn turning... Theirs a lot left for me to learn, I don't know what my friend did but, in his college days he took a course and learned setting crossovers to fiberglass enclosures. At least he did that on his own but he got the technical stuff was in class
I don't have really any in-person experience with subs but I'd be curious to get your take. First: do you have a preferred tuning frequency? And understanding that the ported subs drop off after the tuning frequency, how do you feel about sealed boxes as they extend lower and roll off gradually? Cheers
The tuning frequency will depend on the driver and the application, there is no one magic frequency. For home theater you want a sub that can be tuned low and you want your F3 to be in the low 20's or even high 10's. A car will benefit from cabin gain so you can get away with something in the 30's. If sound quality is your goal (home or car) you want a flat response. Sealed boxes don't extend lower -- they start to drop off at a higher frequency.
This all seems like rocket science to me. I have 2 Rockford fosgate p3 12s on a p1000-1bd in a 73 nova. Im Restricted to 13 height. My usable space is 38x13x20. Any help. Thanks
According to the last box then, would you be able to build it like it was two separate enclosures with the port facing the same way as the subwoofers and just not have a dividing wall between the subwoofers?
Im have a question about the port, and the volume of the box, usin the Winisd. The software calcule the response with the volumen of the drivers too or not? Is necesary discount it in the total volume? The volume of the ports if i want two ports, is each or total? Is it necesary discount it of the volume of the box? Regards from Argentina!
WinISD does not take any of that into account. Just gives you the net airspace, which is the airspace you get after you account for all the stuff you're talking about.
In slot port, the box walls are acting as port walls too, and they extend longer than port. So some people say WINISD shows upto 30% longer port length than needed. How far this is real ?? Any suggestions on this please ???
I probably need to do a video addressing exactly that topic. WinISDs calculations match my own, the only real difference is rounding error. When I actually build the box I adjust for the phenomenon you're talking about. It is not that WinISD is wrong, you just have to make the adjustments when you go to make the box. The box I'm working on right now (The video will go up in September) is tuned higher than I usually tune them with the hopes that I'll get this worked out.
I thought that this happened because the sides (walls) of the port create drag, which slows down the air and affectively makes the port area slightly smaller, reducing the tuning.
what is the ideal port area (Pvc pipe port) for dual 18 inch box tuned to 30-35hz and a box volume of 12-15cuft ? what I know is that ideal port area for one 18inch sub is 55.80 to 89.90 inch2. So for a dual woofer box, should any of these values be doubled to have an optimal port area. For example a port area od 55.80+55.80= 112inch2 should be ideal?
I don't believe in the myth of the ideal port size. The port cross section needs to be big enough to keep from chuffing, but not so big that you cannot realistically fit the port in the enclosure. I would encourage you to check out my WINisd video. th-cam.com/video/yZNeYBYGRKk/w-d-xo.html
Hey how's it going? I have a quick question. I'm building an enclosure for 4 12s the 44 x 18.5 x 28.5 and im wondering what should my port dimensions be to get a tune of around 32 33 34 hertz. Thanks.
If you're looking for a box design I do offer that as a service. If you don't need a full design and just need help with the port modeling I offer that as a service as well. diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html
so i have some free box designs i found online but i dont like how high it is tuned. would i change the plans to make it a longer port? thinner port? both? thanks in advanced
You would need to make the port longer and then make the box bigger to compensate for the lost airspace. I have a few more videos on the topic, and I offer design services. th-cam.com/video/U5BQdnagzW8/w-d-xo.html
Hi Good day tell me i have 2 kicker L7 750rms but want to build a box in my Volkswagen Polo looking for design the box because if I put 2 kicker l7 in it will be 1500 rms how can I design my box to get that deep bass. Thanks
So I built a ported enclosure that's 4cuft but I put a 3 in wide open port and 23 inch length port for 2 mtx 9500 subwoofers and it hits really hard and really low so the question remains is a longer or shorter port still affected by the max excursion a subwoofer can create, or does your method work even for cheap subs that dont move alot of air?
So I need some help if anyone here can help me I want to build a dual 10" subwoofer enclosure ported. I have 2 Rockford foscate P3 series subwoofers and I am putting them in a 2016 Camaro which does not have a lot of trunk space how can I Get the cubic feet that I need and still have the subwoofer enclosure small enough to get it in my trunk? I think I need 1.4 cubic feet for one of the subwoofers. Do I just double that for the cubic feet so it would be 2.8?
I'm having a time designing a box for 2 Wolfram Ti-12 dvc 2 ohm. I used the only specs I could find on Xplicit audio but I think something in the specs was for 4 ohm instead of 2. That or it's because I followed your video for 1 sub but my design required 2. I got the green integrity check at first on Winisd when I followed your video for one sub but then I realized I had 2 so I started over and that's when I failed the integrity check. Could you help me figure out where I went wrong?
Also, I am using an 8" BAP. I wish you had a How to design a box for 2 subs and a round port on Winisd. I know it's something simple I am missing but I don't know what.
I did not focus on that in this video. But it is something that you have to take into account. You can see the impact on F3 in my previous video: th-cam.com/video/-yopTneS7g8/w-d-xo.html In that video I showed three boxes, all tuned the same, but different size. The size had a big impact on the frequency response.
@@DIYAudioGuy in your drawings your vents are outside. I assume that is for demonstration purposes. But what if I wanted to maximize the size of the box and save space ( and maybe hide it from the wife). Could I put the long port outside like that. Maybe run it behind the couch? Or make the sub look like an end table and put the vent under the couch?
@@manningcustom Yes, I Drew the port outside of the enclosure so it would be easier to visualize the different port lengths, and it's perfectly acceptable to make the port outside of the enclosure. I'm just not sure how far away the port opening can be from the subwoofer before it messes with the sound. low frequencies have long wavelengths so you can get away with that, that's why a lot of bookshelf speakers will put the port on the back for example.
Right, when you actually design the enclosure you need to take into account the displacement of the subwoofer inside the enclosure. But for this video I was just trying to describe what happened to the port as you increased or decreased to the size of the enclosure.
Hello I'm new to this bought pre fab box, ported for 2 12's. Box is 1.6 cubic feet the port is 3 inches by 12 inches can you tell me what is this box tuned to???
@@itsjusti4262 take some paper and cut it into strips, but don't cut all the way through the paper. Tape that over the port. Fire the speaker straight up, put a little bit of rice in the cone. Play different test tones, you're looking for the sweet spot where the paper is moving in the rice is not.
This is the second video in a series I am working on. The goal is to provide some easy visuals that hopefully will make port tuning a little easier to understand. Check out video #1 here: th-cam.com/video/-yopTneS7g8/w-d-xo.html
I would like to pay you fir some box specs tuned to 24 hrtz 2 18 inch dd subs redline 800 series
4:27 thank you for the disclamer!!! i really would have thought that ports could think
You know, if I didn't add the disclaimer somebody would make a comment about it.
these videos help me a lot.. now i understand that i need double size box for 2 subwoofers.. i have 1X 12” subwoofer but im going to buy a second one so i need a big box… thanks a lot brother. my single 12” box is tuned to 29hz with a 30cm long 3” aeroport. im pretty new to this port tuning thing.. i had many sealed boxes before
Glad I could help
Had some chuffing on a box I just got ,did some sanding on the internal parts of the ports and man what a difference!! Thanks for the vid btw
Awesome! I'll be sure to share that tip the next time that I make a video on chuffing. Sometimes the slightest little round over can make a huge difference.
@@DIYAudioGuy it's actually on your favorite box too a qbomb LOL
@@DIYAudioGuy yeah it really can I was disappointed and I saw some of your little tricks, so I took my Dremel for the sanding bit and rounded the inside edges of the triangle ports and man it's so much better it's actually beating the shit out of the inside of my car now LOL
1:35 viewer reminder if/when actually designing an enclosure: we need to remember to consider driver displacement also being doubled will decrease volume more so than with having only one sub. But this was irrelevant in this example which is for our sake, keeping it simple, thankfully.
Yes, very true. The subwoofer, port, and any internal bracing all take up space and you need to account for that in the box design.
i just figured the displacement was already figured in for simplicity !
I am swapping out my sealed box for a ported one but its for a bit of a show truck and I want the ports to be symmetrical. It is for a 12' sub that requires 1.38 cubic feet and the port is 12.5" x 1" and 16" long. Can I do two ports 6.25" x1" and still 16" long to get the same frequency? Thank you!
Still learning. Thanks. Audio is so my freakin fun 🤪🔊🥳
Same here! I learn something new every day, such a cool hobby.
Great way to Explain I’m actually in the process of figuring out a 12cf box for (6) 12’s
I bet that's going to be loud!
@@DIYAudioGuy 🤞🏻Just need to figure out the port length ((sighs)
Yea I’m trying to put 4 or 6 flame qs in my envoy. Not sure if I should go port or try a 4 sub 4th
Great video. Going to start putting ports inside box and explaining how to calculate airspace?
That's a good idea.
You never brought up the port end correction. When modeling with WIN ISD do you cut down the port length do to the radiated mass? The equation is Sqrt [4x port area /3.14] = you take this number and multiply by .732 This will give you your actual physical port length. This is the equation that takes your physical port and figures out what your actual acoustical port length is I would like to hear what you think about this! Thank you and great video!
Probably need a whole video just on that! I might do a little research and see what I can come up with.
I want to know more about this... would explain a few things.
Yes yes yes pleeease! I've made 4 different boxes, and all 4 of them ended up being tuned about ~2hz lower than calculated. It's super annoying.
thx 4 this brief and yet informative vid
I have some more port tuning videos in the works.
You are kept very helpful share about subwoofer, it is also demantable post for who want to upgrade their old subwoofer. Thanks for the post.
Thanks for watching.
Port length and tuning stays the same when add multiple woofers as long as u double the math or tripple depending on how many woofers u have for air space...1 box for 1 sub with 1 port tuned to say 35 hz will be the same length u use no matter how many woofers u had...as long as airspace and port area are doubled..tripled..ect...very easy concept to understand
What software are you using to determine tuning vs size vs port size?
Much obliged, very informative.
Glad to be of help.
When using WinISD, I design a box for tuning H, and volume V, and I select to have 2 ports. WinISD then calculates a port length. Do I build each of my two ports to be 1/2 of the Vent Length that WinISD is displaying in the Vents tab? Thank you.
No. Both ports will be the length given in WinISD.
If I'm ok with chuffing noise is there any disadvantage of having thinner ports? My box manufacturer gave pair 3" PVC ports to reduce the cost with 6" lenght to each port. Box net volume is 4 cubic feet. Now I have lots of port noise but its not audible when I'm loud due to mid highs. So am I lossing efficiency due to small ports forced to travel pressurized air?
If the chuffing is not audible then you are probably not losing enough output to be worried.
Can't wait for a laptop, to actually design a build in 3D. Then print it out, I've been drawing my designs by hand with a square and graph paper. Not always to the mm or ft on the sheet but comes out right it's just the cuts I need to perfect..And learn turning... Theirs a lot left for me to learn, I don't know what my friend did but, in his college days he took a course and learned setting crossovers to fiberglass enclosures. At least he did that on his own but he got the technical stuff was in class
Sounds awesome!
Can you make a video on how to build a test table to test subs and enclosures in the shop or garage.
That is a good idea!
@@DIYAudioGuy Thank you in advance. I really appreciate it.
I don't have really any in-person experience with subs but I'd be curious to get your take. First: do you have a preferred tuning frequency? And understanding that the ported subs drop off after the tuning frequency, how do you feel about sealed boxes as they extend lower and roll off gradually? Cheers
The tuning frequency will depend on the driver and the application, there is no one magic frequency. For home theater you want a sub that can be tuned low and you want your F3 to be in the low 20's or even high 10's. A car will benefit from cabin gain so you can get away with something in the 30's. If sound quality is your goal (home or car) you want a flat response. Sealed boxes don't extend lower -- they start to drop off at a higher frequency.
@@DIYAudioGuy Thanks for the quick response! I'll keep that in mind. My set up is music focused with Magnepans.
Nice!
I know the pictures are for demonstration only but could you have 2 opposing ports with subs between them or would that cause other problems?
I can't think of any reason why you couldn't do that.
This all seems like rocket science to me. I have 2 Rockford fosgate p3 12s on a p1000-1bd in a 73 nova. Im Restricted to 13 height. My usable space is 38x13x20. Any help. Thanks
I just responded to your email.
What is the size of the daul subwoofer box length with and height
According to the last box then, would you be able to build it like it was two separate enclosures with the port facing the same way as the subwoofers and just not have a dividing wall between the subwoofers?
Yes
Im have a question about the port, and the volume of the box, usin the Winisd. The software calcule the response with the volumen of the drivers too or not? Is necesary discount it in the total volume? The volume of the ports if i want two ports, is each or total? Is it necesary discount it of the volume of the box? Regards from Argentina!
WinISD does not take any of that into account. Just gives you the net airspace, which is the airspace you get after you account for all the stuff you're talking about.
you should also take vas of the sub in to account to get the port area needed for the subs other wise you end up with port noise
I usually just look at the port velocity in WINisd.
@@DIYAudioGuy that works two but I don’t like winisd it’s useful but not at the same time
In slot port, the box walls are acting as port walls too, and they extend longer than port. So some people say WINISD shows upto 30% longer port length than needed. How far this is real ?? Any suggestions on this please ???
I probably need to do a video addressing exactly that topic. WinISDs calculations match my own, the only real difference is rounding error. When I actually build the box I adjust for the phenomenon you're talking about.
It is not that WinISD is wrong, you just have to make the adjustments when you go to make the box.
The box I'm working on right now (The video will go up in September) is tuned higher than I usually tune them with the hopes that I'll get this worked out.
@@DIYAudioGuy thats an awesome coincidence and eagerly waiting for September video. 😀😀😀😀😀👍👍👍 Thanks for replying !!! 😊
I thought that this happened because the sides (walls) of the port create drag, which slows down the air and affectively makes the port area slightly smaller, reducing the tuning.
what is the ideal port area (Pvc pipe port) for dual 18 inch box tuned to 30-35hz and a box volume of 12-15cuft ? what I know is that ideal port area for one 18inch sub is 55.80 to 89.90 inch2. So for a dual woofer box, should any of these values be doubled to have an optimal port area. For example a port area od 55.80+55.80= 112inch2 should be ideal?
I don't believe in the myth of the ideal port size. The port cross section needs to be big enough to keep from chuffing, but not so big that you cannot realistically fit the port in the enclosure. I would encourage you to check out my WINisd video. th-cam.com/video/yZNeYBYGRKk/w-d-xo.html
Hey how's it going? I have a quick question. I'm building an enclosure for 4 12s the 44 x 18.5 x 28.5 and im wondering what should my port dimensions be to get a tune of around 32 33 34 hertz. Thanks.
If you're looking for a box design I do offer that as a service. If you don't need a full design and just need help with the port modeling I offer that as a service as well.
diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html
so i have some free box designs i found online but i dont like how high it is tuned. would i change the plans to make it a longer port? thinner port? both? thanks in advanced
You would need to make the port longer and then make the box bigger to compensate for the lost airspace. I have a few more videos on the topic, and I offer design services. th-cam.com/video/U5BQdnagzW8/w-d-xo.html
Hi
Good day tell me i have 2 kicker L7 750rms but want to build a box in my Volkswagen Polo looking for design the box because if I put 2 kicker l7 in it will be 1500 rms how can I design my box to get that deep bass.
Thanks
MBEnclosures here on TH-cam. He's the expert on getting the 8-in l7's to reach their full potential.
So I built a ported enclosure that's 4cuft but I put a 3 in wide open port and 23 inch length port for 2 mtx 9500 subwoofers and it hits really hard and really low so the question remains is a longer or shorter port still affected by the max excursion a subwoofer can create, or does your method work even for cheap subs that dont move alot of air?
It works for all subwoofers.
So a 16cuft box would have a port dimensions of?
That will depend upon the tuning frequency and the size of the port opening.
Which software u use for making 3d model of box
SketchUp
So I need some help if anyone here can help me I want to build a dual 10" subwoofer enclosure ported. I have 2 Rockford foscate P3 series subwoofers and I am putting them in a 2016 Camaro which does not have a lot of trunk space how can I Get the cubic feet that I need and still have the subwoofer enclosure small enough to get it in my trunk? I think I need 1.4 cubic feet for one of the subwoofers. Do I just double that for the cubic feet so it would be 2.8?
can you calculate an box for.
4x 10 subs tuned at 28 hertz?
the subs are, caliber cw10 200 rms 600 peak.
diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html
Can I just pay somebody to design me a port 😂
I'm having a time designing a box for 2 Wolfram Ti-12 dvc 2 ohm. I used the only specs I could find on Xplicit audio but I think something in the specs was for 4 ohm instead of 2. That or it's because I followed your video for 1 sub but my design required 2. I got the green integrity check at first on Winisd when I followed your video for one sub but then I realized I had 2 so I started over and that's when I failed the integrity check. Could you help me figure out where I went wrong?
Also, I am using an 8" BAP. I wish you had a How to design a box for 2 subs and a round port on Winisd. I know it's something simple I am missing but I don't know what.
If the integrity check worked for one sub, it should work for 2. That is kind of odd.
Just pick two subs instead of 1 and select a round port in WinISD.
Can u face the port straight out the back ?
Yes
Do you consider the F3 tuning drop in you analysis or should we just focus on fb?
I did not focus on that in this video. But it is something that you have to take into account. You can see the impact on F3 in my previous video: th-cam.com/video/-yopTneS7g8/w-d-xo.html In that video I showed three boxes, all tuned the same, but different size. The size had a big impact on the frequency response.
Does double baffling a subwoofer box Change tuning??
Only if the port goes out of the front baffle, then the port is 3/4 of an inch longer and that will change the tuning.
@@DIYAudioGuy thanks mann
Sir, I need a design of box. Can u help me🥺🥺
diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html
@@DIYAudioGuy sir, I have a 2 woofers 10 inch give me a design of box. But i use at home plxx sir🥺
@@mr.kameena.0047 Just follow the link. You'll see my prices there.
Interesting. Makes sense that a 1" port is too damn small for 2 woofers lol.
If you want big bass you need a big port and a big box.
why 28hz?
No reason, just a number I pulled out of the air for the example.
@@DIYAudioGuy in your drawings your vents are outside. I assume that is for demonstration purposes. But what if I wanted to maximize the size of the box and save space ( and maybe hide it from the wife). Could I put the long port outside like that. Maybe run it behind the couch? Or make the sub look like an end table and put the vent under the couch?
@@manningcustom Yes, I Drew the port outside of the enclosure so it would be easier to visualize the different port lengths, and it's perfectly acceptable to make the port outside of the enclosure. I'm just not sure how far away the port opening can be from the subwoofer before it messes with the sound. low frequencies have long wavelengths so you can get away with that, that's why a lot of bookshelf speakers will put the port on the back for example.
You're wrong on your two boxes of 4 cubes having the same size port. They won't bc you have to remove additional sub displacement
Right, when you actually design the enclosure you need to take into account the displacement of the subwoofer inside the enclosure. But for this video I was just trying to describe what happened to the port as you increased or decreased to the size of the enclosure.
Why do people tune subwoofer enclosures so low just to run them at 63 or 80 hz on the head unit and amplifier?
What?
You should have just doubled the area of the port, no?
This video shows what happens when you do that.
You lost me when you said 1 by 12 port? What do you mean? Thanks.
1 inch wide, 12 inch tall
@@DIYAudioGuy ok thank you.
Hello sir
Just made me more confused.
Hopefully this one will help clear it up. th-cam.com/video/-yopTneS7g8/w-d-xo.html
Hello I'm new to this bought pre fab box, ported for 2 12's. Box is 1.6 cubic feet the port is 3 inches by 12 inches can you tell me what is this box tuned to???
Use the rice and paper trick.
@DIY Audio Guy what's that my friend, how do I do it
@@itsjusti4262 take some paper and cut it into strips, but don't cut all the way through the paper. Tape that over the port. Fire the speaker straight up, put a little bit of rice in the cone. Play different test tones, you're looking for the sweet spot where the paper is moving in the rice is not.