Understanding Port Length, Box Volume, and Tuning Frequency.

[@st170ish]

Excellent very informative!

[@DIYAudioGuy]

Glad it was helpful!

[@mariatori2374]

@@DIYAudioGuy hello sir can I ask for your suggestion box for a Groundzero GZIW 12 SPL to make it hit lower bass.

[@ashleymalone5396]

THIS is where I need to expand my knowledge. Good info.

[@DIYAudioGuy]

You're just aren't a lot of videos out there that explain this.

[@BabyCharlotteschannel]

@@DIYAudioGuy yeah for sure. We all know that there are Lot's of SPL guys hitting one note at their peak but aside from that stuff I haven't seen much about finding a nice low tuned box with a reasonably sized port area to keep port noise to a minimum. God willing I can sell something or get a good side job that'll enable me to buy this nice custom box with a level 4 DC Audio 12" sub included with it. ,* Thinking about doing something similar to my last car audio build with a 12" in a better box than last time, and a 15" in bigger & lower tuned box then at least one set of decent 6x9's in those little sealed boxes plus the fairly good speakers already in the factory locations for mids and highs. *Too bad I didn't have a really good way I can think of to mount the 6x9's in something bigger cause I've seen some amazing sounding 6x9's mounted in the back deck of a Ford escort hatchback and even some mounted in the rear deck with the trunk as the enclosure.. I just might have to build some slightly larger sealed boxes for them maybe on each side of the rear seat of my first generation Grand Cherokee I just picked up. Guess it all depends on if I can make the Extra approximately $300 for everything from the 12" and custom box, a Little package deal with a couple of good full range amps and a box with dual 10"s I believe etc, and then the pair of 6x9's for some nice and solid mids and highs.. getting most of this stuff used, plus still having some things I just couldn't include with the car and system I sold my Buddy!!

[@td2791]

I'm about to build my first enclosure for a SQL-12. Your explanations and use of WinISD is exceptionally helpful. Thank you for explaining so clearly, it makes me less nervous about building my own.

[@DIYAudioGuy]

Glad it was helpful!

[@mikewhite4541]

Fantastic video. Best one I've found explaining the difference. I've built alot of boxes and had to just learn by trials and errors. This is badass.

[@FireMedic312]

I used this video and 2-3 others to build me a dual vented, dual 12” enclosure. First slot vent I ever built and it is superb. Winisd came in clutch.

[@DIYAudioGuy]

Great to hear!

[@gordythecreator]

Your explaining exactly what I've been HEARING for years now. I didn't want to figure out the formula for myself, and I assumed someone had already done that

[@DIYAudioGuy]

That's cool!

[@seanyounk1]

Holy moly. My head is about to explode! I'm going back to your oscilliscope video to make sure I am doing this correctly so I don't damage anything. Thank you again for all the incredible information.

[@DIYAudioGuy]

Glad to help.

[@preston2078]

I've watched this video like 6 times while making my first box. Thank you

[@DIYAudioGuy]

Glad to be of help.

[@Bassotronics]

Another thing to note is depending on where there port opening finishes (near the enclosure or far from the enclosure) will also affect tuning despite the length due to different frequencies having different wavelengths. Port location is also crucial to the overall frequency response. (Phasing).

[@DIYAudioGuy]

Yeah, there is a lot more to it! I need to build some boxes and take some measurements!

[@BabyCharlotteschannel]

I like that, very important. Probably equally as important as positioning of the sub, and port too I would think, i.e. sub parallel to the rear door of a minivan or SUV etc..

[@Im4the1]

@bassotronics you have me very curious and wanting to research details of your response. Watching this video as a refresher on building a ported box, I was wondering if I could do a slotted port external to make under seat sub box. As in the drawings in this video, the port external going over the transmission tunnel. Do you have any recommendations on further study?

[@ganeshkc1397]

One of the best explanation in one of the most simplest words .. Thank you so much

[@DIYAudioGuy]

Glad it was helpful!

[@sveneisenhauer1]

Ah, finally a tutorial that puts this into better perspective. Thanks! Now, please also build the boxes and show us and you’ll have friends forever...! 🤗😇

[@DIYAudioGuy]

That is definitely in the works! Just waiting on the time and the money to do it. In the meantime: kzbin.info/www/bejne/mpO5lWifnMidftU

[@feedrate1]

Love all the hard work you put in to your channel. Definitely one of my favorite channels!!🤘🤘🤘

[@almetej29]

By far the best video ever on enclosures. Well done

[@DIYAudioGuy]

Thanks.

[@drywater_]

I remember spending months teaching myself this stuff back in highschool. Wish you were around back then lol

[@DIYAudioGuy]

I was around, I was just not making videos.

[@303nitzubishi4]

Excellent explanation. I have read up on velocity V excursion a couple times and vaguely understood it, but your presentation of the sketchups and graphs really solidify the principles in my mind. I am indebted to you sirr thank you:)

[@DIYAudioGuy]

You are welcome.

[@agghell224]

I was looking for a port explanation and i found it. New subscriber here !!!

[@shawnsanderson3695]

Got a lot out of this and right on time for my latest build. Thanks

[@DIYAudioGuy]

Glad I could help!

[@randomtoyotadude8952]

Love this video, watched it many times.. to make sure i understand this. Thx DIY dude ;)

[@DIYAudioGuy]

Glad it helped!

[@jmjm003]

Years ago (90s) when I had a Fiero our local audio shop placed a JL Audio 10" in the front trunk and vented it through the passenger side floor. The way this video starts kind of makes sense to me now how they did it. It was a very custom job back then and might even be considered so today. To look in the front trunk all you would see is a box as the sub was inside firing into the port area.

[@DIYAudioGuy]

That sounds like a bandpass.

[@ReferenceFidelityComponents]

A few things: turbulence occurs well below 18m/s, more like 11m/s. Size of port may not influence transfer function in CAD but the realty us that it will increase impedance coupling efficiency with the room air mass which is beneficial. Rule of thumb is to use a port area approx 30% of the area of the driver. You loose port efficiency and alter system Q by using folded line ports compared with port tubes with or without elbows but straight vents are fine. Experienced designers know that box calculators over simplify the expertise needed to maximise SQ, system efficiency and to more accurately design and tune a vented system which ideally also includes system impedance testing.

[@SandersAmps]

Greeeeeeaaat video. I build some cabinets for the first time using ESI (extra spacial intuition - i.e. guesswork :) and found them to be surprisingly close to what I needed. Didn't take air velocity into account though. Or a bunch of other things. But your explanation helped me understand what I'd done, and how to tune them better. Thank you!

[@DIYAudioGuy]

Thanks!

[@AwestruckAudioHertz]

Another excellent video, thanks for taking the time to explain this in terms pretty much anyone can understand. We are always learning!

[@DIYAudioGuy]

Glad it was helpful!

[@arnicus208]

I’ve watched numerous videos on this channel, and I definitely get the feeling he doesn’t like sealed enclosures

[@DIYAudioGuy]

They both have their place. I don't post a lot of videos about sealed enclosures because they are simple to design and build, and don't require a lot of technical knowledge.

[@CarsPaint]

So much information , THANK YOU SO MUCH SIR 🙏

[@mhnoni]

I've learned a lot from this channel, thank you so much.

[@AussyOutlaw]

Oh man! I learned something new today! Thanks man!!

[@DIYAudioGuy]

Good!

[@AspectRatioPolice]

So glad I don't have to deal with inches

[@4077661466jp]

I believe all this comes into play depending on the subwoofer being used and what enclosure it performs best in, a subwoofer that's spec values may sound horrible in a ported enclosure but then sound 10 times better in a sealed enclosure of similar size as example, sealed boxes aren't bad but also depends on type of music, space available for enclosure etc, all these graphs your showing is with what subwoofer and application it will be installed in trunk,suv or truck etc, what im trying to figure out is a round about way of including cabin gain to tune of enclosure

[@dennis3004psp]

Xmax is the reason why i go 3 or 6 db below the max this works very well and over 100db is a good trade off for sound quality

[@DIYAudioGuy]

👍👊

[@reverbae]

Hey My Prefab Subwoofer Box Tuned At 35Hz Is It Good If Not How To Get It More Lower I Am New At This Please Help😊

[@DIYAudioGuy]

That is probably just fine, but it will depend on your subwoofer. If you are happy with the sound then don't change anything.

[@reverbae]

@@DIYAudioGuy i don't have Subwoofer i had woofer 8"

[@reverbae]

60w 8ohm

[@reverbae]

@@DIYAudioGuy but i wanna go more lower so tell me how to do that

[@somekiwidude]

Damn this gets technical making my first ported box wish me luck

[@randybaltimore4605]

Thanks alot, I'm starting to understand alot more !!

[@DIYAudioGuy]

Glad to help.

[@alanfarmer5730]

Theile & Small parameters are important for selecting drivers to design compact enclosures.

[@fz6rider072]

Thanks in advance for my previous question I built a box for two X8 V4 and I missed my mark, only by 0.1 on the net box volume, but I severely missed the Port length, it's tuned to about 25 hz I was shooting for around 33 hz, I can shorten the port but that makes me miss my 2 cube net box, end result will be close to 2.3 net 33 hz, Love the videos I learn a lot from your content

[@jpfaff777]

What an awesome video. Very informative. Thank you 🙏

[@DIYAudioGuy]

Glad you enjoyed it!

[@Angelovelato11]

Sono stanco di essere preso in giro da te e il tuo compare 🌇

[@gkk2001]

Your videos are maybe the best for us DIYers. I tried WINISD and find it has a mind of its own. Entered sub data and it changed many entries, same units but a different number. Also have a serious conflict comparing 2 subs in the same box, one gives port velocity of 20+ while other is near 2. Could not bring them close after manipulating most sub T/S parameters. I really do not like WinISD despite its free. I got what I paid for.

[@DIYAudioGuy]

I hear you! I think I am about to outgrow WinISD. WinISD will auto-calculate parameters. It is always better to let WinISD do the calculations, or the driver integrity check will fail.

[@BabyCharlotteschannel]

It has it's limitations BUT, it's free and will DEFINITELY help with designing a better sounding box for the specific subwoofer you have! Those of us that are true audiophiles can always use more data AND real world testing. Moving whatever box around plays a huge part of it all along with the specific vehicle and the cabin gain and general acoustics too.. Hopefully I worded that properly.. lol, just waking up after a long sleep just recovering from the chi-flu so I'm not quite at a hundred percent yet..

[@vikassm]

Me after this video: I KNOW KUNG FU!!

[@DIYAudioGuy]

🤣

[@daveanthonysalalima1128]

None sense.😢

[@christianolssontravels]

Neo! 😂

[@rowlesorama]

Show me

[@authenticNL2]

​​@@rowlesorama This is a sparring program!

[@dannypalmer7701]

My friend made a 4×4 Bass Box and you can hear his Bass coming mile away ! Thunder!!

[@andrewforsythe7240]

Excellent videos. Just discovered your channel, glad I did !! Thank you.

[@DIYAudioGuy]

Welcome to the party!

[@Bigislandguy]

Do you think it would matter if the sub is mounted center in an enclosure versus offset? Would it affect the spl or sq?

[@DJCJ999]

Hey! So I need to make a custom sub enclosure to go under the back seats of my truck... How do I go about sizing a sub and tuning the enclosure? My starting point would be to make the custom box the max size possible.. from there I will know the cu3 capacity of the box.. with that information how do I then size a sub for that box?

[@josearias8433]

My confusion comes in when you squeeze the port into a box, youre bringing down the air space of the box, therefore, how do you really know what the port length should be when fitting it in a box? For example. A 4 cubic ft box is asking for a 9 inch port length for 30hz but once squeezed in the 4 cubic ft box, that is no longer 4 cubic ft and needs a different size port for the 30hz

[@DIYAudioGuy]

You just have to make the box bigger, the problem is that you often find yourself in a loop.

[@r3d-1truth17]

Thanks for all your hard work and detailed efforts! Great stuff, and supersized knowledge boosters! I want to know if you build boxes for sale? I really don’t think I have a shop in my city that does your calculated and measured technique and approach for boxes. And I really would like another tuned box for my next two cars audio systems.

[@DIYAudioGuy]

I don't. Mostly due to shipping costs.

[@Fernando.Canal2]

This is a trully masterclass

[@DIYAudioGuy]

Thanks!

[@gsxroyce256]

At the 5 min mark, where we see the sub over extending, if you move the tuning frequency up from 28 to 35, to put that dip where the sub don’t move much at the tuning frequency, would that eliminate over excursion on the 4qf box? Edit/ NM you answered that at the 8:15 mark. My bad I should’ve just kept watching lol

[@fullsendmarinedarwin7244]

Group delay is important if sound quality so important to you. Ported will always have bigger GD than sealed but they can sound good if you spend the time with design software getting it dialed in

[@exislaamnowbeinganinsaanah3302]

Great! 👌You described properly .... Very informative 👍

[@DIYAudioGuy]

Glad you liked it.

[@exislaamnowbeinganinsaanah3302]

@@DIYAudioGuy 💐 🙏

[@chrishuyler3580]

Let's say I'm ok with the physical dimensions of the box with a longer and larger overall cross section port, at what point does air velocity become a problem on the lower end of your chart @11:33 time stamp? Example: Manufacturer calls for a single 4" round port 11" in length for a 12" subwoofer in 2.0 cuft. I'm considering two 6.5"x1.5" slot ports 20" in length on either side of my design.

[@DIYAudioGuy]

For sound quality you want to keep the port velocity below 17 m/s. You can get away with more for an SPL build (as much as 30 some say). Flared ports should let you double that number.

[@chrishuyler3580]

@@DIYAudioGuy I'm talking about the opposite end of the spectrum, where velocity is significantly below 17 m/s because the ports are huge and long.

[@travisgulley2652]

Can a 10 inch cutout hole on a 10 inch subwoofer enclosure be enlarged to fit a 12 inch subwoofer if so will it be a tight fit for the subwoofer and cause the subwoofer to not sound the best.

[@DIYAudioGuy]

Yes, you can make the hole bigger, but 12's typically need more airspace than 10's to sound their best. So I don't recommend that you do that.

[@doctorhaircut]

Does the shape of the box affect the tuning? I want to build a single 15" box at 3.5 Cubic ft but the dimensions I have seen online are too deep to fit in my vehicle. If I make I take an inch off the depth and make it an inch taller, would that affect a lot?

[@JoePalmer-zp4wx]

I am in serious need of some help with my custom build. I have watched your video and so many others trying to tune my custom box in WinISD and just can not figure it out. now maybe its because I entered my driver information in incorrectly but it did show up green and allow me to move forward. so I just bought a Skar audio VXF 12" 2 ohm and it calls for a recommended 2 FT3 @ 33Hz in a ported box. I can get con excursion perfect and the transfer function magnitude perfect but I'm always way over air velocity. I'm over 10' of port or 8 flanged tubes @ over 8" each. I'm willing to donate or what ever it takes at this point to get the dimensions I need to process. Let me know if there's something I'm missing. Thanks!!!!

[@sdrtech]

Can you please explain why port length changes when you switch the height and width? Shouldnt it be the same since the vent area is the same

[@DIYAudioGuy]

If the vent cross section area is the same then the vent length should be the same.

[@sdrtech]

@@DIYAudioGuy i agree but the software doesnt lol.. Just make sure I wasnt losing my mind thanks

[@travisgulley2652]

If you were to plug up the port on a subwoofer enclosure with a giant cork to make it a sealed enclosure will the giant cork get blown out of the port if you crank up the volume really loud and if the subwoofer is getting a lot of power

[@DIYAudioGuy]

That depends on how tight the seal is. There are some home theater subwoofers that use this principle.

[@gavinlamp]

awesome work, great information.

[@travisgulley2652]

Will 2 Dayton audio ultimax 18 inch subwoofers in a ported enclosure break the windows in a room if the house is really old and if the windows themselves are really old

[@DIYAudioGuy]

Probably not, but I can't offer any guarantee.

[@travisgulley2652]

Do all qpower prefabricated subwoofer enclosures that are already assembled have screws holding them together.

[@DIYAudioGuy]

I'm not sure. I build all of my boxes with glue and Brad nails.

[@travisgulley2652]

Can a old 12 inch guitar amplifier cabinet be used as a subwoofer enclosure for a 12 inch car subwoofer.

[@DIYAudioGuy]

That depends. If it's a bass then maybe yes. But normal guitar captain has an open back so that will not work. The other thing to remember is that the drivers use bass guitar amplifiers are just PA drivers. They're not tuned terribly low. Just eyeballing them in the guitar shop, they all seem to have very small and short ports. I'm guessing they're tuned around 40 hertz. So that will be fine if you're just going to play normal music, but if you're going to play a bunch of rebased or trap/edm you'll probably damage the driver.

[@HighVybeTribe]

i have seen plenty of subwoofer box builds where the port is external . Matter of fact a 1 cu ft enclosure for a 10 " sub with a 3inch Aero port about 10 " long

[@DIYAudioGuy]

It's not a very common design, but it works..

[@travisgulley2652]

If you enlarged a 10 inch cutout hole on a 10 inch subwoofer enclosure to fit a 12 inch subwoofer into the enclosure would you suffocate the subwoofer itself or possibly block the vent on the back of the subwoofer itself if the subwoofer ends up getting mounted into the enclosure itself after enlarging the cutout hole.

[@DIYAudioGuy]

Cramming a 12 into a box design for a 10 is a bad idea.

[@garyosborn3168]

Does the internal airspace of the port count towards the internal airspace of the box

[@DIYAudioGuy]

Nope.

[@fz6rider072]

Quick question if I go to the 12 volt website port calculator and it asked me for the box volume and my tuning to find the length for the port is the box volume it's asking for net after subwoofer displacement or gross box volume?

[@travisgulley2652]

Can you plug a big 15 inch high powered active subwoofer that has a plate amplifier with 1000 watts of power consumption into the 120 volt ac outlet on the back of a home theater receiver

[@DIYAudioGuy]

Probably not. It depends on the amp rating of the outlet.

[@travisgulley2652]

What is different about a sealed subwoofer enclosure compared to a ported subwoofer enclosure.

[@DIYAudioGuy]

Ported plays lower and louder, everything else held equal. Some will argue that sealed sounds better but I disagree.

[@fullsendmarinedarwin7244]

Sound quality group delay is extremely important. Ported enclosure the pressure from the port is 360 degrees out of phase (delayed) so it has a reinforcing effect but it can make the bass sound “delayed” you can kind of compensate with time alignment but not really. Sealed might have a group delay of 5-8mS, ported is more like 25-30mS

[@draydentyrrell5134]

Helpful video! Thank you!

[@DIYAudioGuy]

You are welcome.

[@miatadawg]

im quite dyslexic and when i designned my box in some rando software for the net i accedentally set my speaker magnet volume to be a few cubic feet, my 1.5 sq ft box ended up being nearly a 4 foot box, i made 2, and boy howdy did it hit those lows hard, haha

[@evrenodabas6154]

hello i have cervin vega wmax 15.2 and i couldn't manage to make a box for it can you help me thank you so can you make me a box sizer

[@DIYAudioGuy]

I offer design services. diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html I don't build boxes, the shipping cost is just too high.

[@Classic-lips]

Thanks for the awesome video. Your channel should be the most watched audio channel on KZbin. You mentioned a 1x12 slot port. It reminded me of something I read years ago. Have you heard of the "rule of thumb," I believe that says, "you shouldn't go beyond 14:1 on slot ports." Just curious if you've got a take on this? Thanks again!

[@DIYAudioGuy]

Yeah, it's got something to do with the wetted surface area of a pipe versus the cross-sectional area of the pipe. Apparently that affects the Reynolds number.

[@RydinginStyle72]

What about round flared plastic ports? Like say a 3in diameter tube with a flare that's 12 in Long in a 2ft cu box? So if you were to drill a couple 3 in Holes and add the flared plastic parts of a certain length? Would that work?

[@DIYAudioGuy]

Yes, flares are great, they reduce port noise

[@gsxroyce256]

I’ve always build my own boxes but never knowing what I doing lol. But always got lucky. I build a box for a single 18 evl Skar. It was 3qft with 8” round port that was 23” long and was 3” from the back of the box. It peaked sub at 50hz. I left it alone bc l don’t know what to do and it sound fine so it was what it was. It could’ve been a lot better now that I’ve seen this

[@LGFoutdoors]

Port on my latest box build is 4.75” x15.5” x22.25” 2 15s tunes to 30.6 hz

[@DIYAudioGuy]

I bet the box is HUGE!

[@realchronal]

genuinely helpful, +1 subscriber keep it up!

[@321ror]

Does increasing the vent length slow down the air speed while keeping everything else constant.

[@chadputt116]

Oh yes you are the best. I watch this yet I have an odd question still. I have a couple of Sundown Audio subs. One is an E12v1 D2 ( I believe) and a E12v3 D4. The E13V1 I have a Kicker DX500.1 1 0hm amp and the E12v3 I have a DX500.1 2 Ohm amp and a Kicker CXA1200.1 2 Ohms. I have been running onr 12 inch subwoofer on and off for as long as I can remember I. I have always used sealed enclousres that I built myself. Fairly simple rectangle builds. Even with the sundown I started sealed and moved to slot ported. Ok...I built, well have cut out a box from Sundown's site that is 1.75 tuned to 32. The box has a single baffle and after all the cutting and fitting I have decided I would like to slap a second baffle if not for support the for looks. The sub and port both front or rear firing depending which you call front or back. Sub is offset about 3" inches off center next to a 2"slot port. My question is, if I add a a second baffle on the outside, not changing inner volume and the baffle will only effect one side of the 4 sided slot next to the sub. So it will be the long side of slot leaving 1 long and 2 short sides open. Will the box read that as I have changed the port length? Sorry for the long story...thank you.

[@DIYAudioGuy]

Yes, but it will not make a big difference. The port will be longer by 1/2 the thickness of your material.

[@Petethebuilder]

Does the tunning change if you Put the port inside the box and why did you put the ports outside the box if that's not what normally gets done???

[@DIYAudioGuy]

I put the ports outside of the box just to make it easier to see. As long as you account for the airspace taken up by the port so that the net airspace is the same, the tuning will be the same. Hope that makes sense.

[@ILKOSTFU]

Awesome, thanks a lot!👌

[@DIYAudioGuy]

Happy to help!

[@travisgulley2652]

If you tuned a ported subwoofer enclosure to 100 hertz will the subwoofer still produce loud bass.

[@DIYAudioGuy]

Loud, yes, very loud. Low? Not at all.

[@Likeaboss236]

I was planning to Tune a box at 32HZ for a 2db peak with an F3 at about 27HZ but I saw that you said that F3 wouldn’t be great for Hip-hop which is primarily what I play. What is usually a good F3 to aim for being able to play? I’m installing in a trunk so I understand that this will affect the lower the tuning as well.

[@magnumcipher4971]

What impact does the use of an enclosure wall for the structure of a vent actually have on the effective vent length and subsequent enclosure tuning frequency? In my experience, it marginally but measurably lowers the effective tuning frequency where the total vent area is less than 12-15 square inches. Maybe I'm just splitting hairs..

[@DIYAudioGuy]

It makes the effective length of the port longer by the width of the port. So if you have a 3-in wide port, you need to make your port 3 in shorter in order to hit your tuning frequency.

[@surhrvrtidnf]

I plan to do blutooth speaker with no port instead with 3 passive drivers it's gonna handle 40 watts 4 ohm 5 inch woofer and 2 tweeters ,do you think passive drivers make up for no port?

[@DIYAudioGuy]

Yes! kzbin.info/www/bejne/rGXVcp6umNBllbM

[@96MustangBoy1]

I asked this in your other video. How can you tune two tube ports ?

[@DIYAudioGuy]

Each Port will tune half of the enclosure. So if you have a 2 cubic foot box and you use two ports then the ports will be the same size as if you only had one port in a one cubic foot box.

[@96MustangBoy1]

@@DIYAudioGuy thanks

[@DNL82]

Nice information 👌, wish I wasn't so dumb so I could make use of this. 🤣😅

[@DIYAudioGuy]

I am confident that you can figure it out.

[@hippo-potamus]

1:03 Ive wondered about ports that are that small. If you can have that 4cu volume would that port be good or would it act more like a leaky sealed box?

[@DIYAudioGuy]

I don't recommend the 4 CU FT box with the 1X12 slot port and a 10" subwoofer. It was meant to be a completely absurd example.

[@v.tuccero1087]

Great info. I want to make a 2nd and improved pair of custom motorcycle sidebags. First pair looked and sounded awesome but the subs were firing into the rear wheel. Where can I have someone help design the subwoofer porting? I have a plan but know knowledge of port tuning

[@DIYAudioGuy]

Rossi performance motorcycle in Albany Georgia.

[@v.tuccero1087]

@@DIYAudioGuy I am building them myself. I need info on porting size for Polk 8" marine subs

[@gtg-inspections]

Really interesting. Thanks for your explanation. Are conical ports a thing?

[@DIYAudioGuy]

Flared ports are conical.

[@travisgulley2652]

Can you use round metal duct pipe from the Home Depot to make a port for a ported subwoofer enclosure.

[@DIYAudioGuy]

Like a stovepipe? I think it would resonate to much.

[@jerrettarmstrong5859]

I want to know about using 2 round ports compared to 1 bigger round port

[@DIYAudioGuy]

It works the same as using two slot ports instead of one slot port. Each port only sees half of the enclosure.

[@jerrettarmstrong5859]

@@DIYAudioGuy I'm about to do a different build and go with 1 15 in the middle of my single cab and thinking of doing 2 ports one on each side facing up. Or just use 1 on the passenger side to help with loading?

[@travisgulley2652]

Will a port on a ported subwoofer enclosure suck up dirt and debris.

[@DIYAudioGuy]

Anything that it pulls in will be blown right back out.

[@triggah1435]

Can you explain horn enclosures and the benefits?

[@DIYAudioGuy]

I don't know much about them.

[@fullsendmarinedarwin7244]

Tapped horn is where the magic happens, but huge box size. I built one for a single 12” and it was like 8cu ft . Played down to 25Hz at 130db tho

[@jalang63]

how does a person decide what frequency to tune the box to? is it based on one of the T/S parameters?

[@DIYAudioGuy]

It is based on how you want to use the speaker and the driver you choose. A home theater sub is typically tuned much lower than a car sub. A 6" driver in a bookshelf speaker is tuned even higher. I model the response in WinISD and use that to guide my choices. kzbin.info/www/bejne/r4uxlox4jqyFgc0

[@jalang63]

@@DIYAudioGuy does the speaker's specs have anything to do with the tuning frequency? i dont get it.I assume that I dont tune a box lower then the driver can produce and I wouldnt go alot higher then the driver produces, but I am new to speaker building. Is there a bump where the box is tuned?

[@DIYAudioGuy]

@@jalang63 yes, but it's a complex interplay of the parameters with the enclosure. So I just use free software to do it. kzbin.info/www/bejne/r4uxlox4jqyFgc0

[@mkloudsql3285]

Been thinking allot about ports recently. Got a question thoe cuz i cant find an anser. Ive got to believe there is such thing as the perfect port size and length given a freq say 31. Shortt and narrow vs wide open and long. Question 1 is there such thing as to big or to small a port keeping the same freq. Question 2 how do you determine the perfect port for a tune. A great example sub would be a DC audio neo 4.0 thanks 😎

[@DIYAudioGuy]

You want the port opening to be big enough to avoid port noise, and then from their the proper length to get your tuning frequency.

[@chriscrockett5969]

Excellent information. I just received 2 - 12” kicker comp Q. I love rock , metal and old school rap. Will this be better for a sealed enclosure????

[@DIYAudioGuy]

I tend to prefer ported, but that is just me.

[@chriscrockett5969]

@@DIYAudioGuy will it be able to play a wide genre of music without sounding boomy

[@chriscrockett5969]

@@DIYAudioGuy can you design something for me or point me in the right direction? I will pay for your time

[@DIYAudioGuy]

@@chriscrockett5969 Yes, just have to tune it properly.

[@DIYAudioGuy]

@@chriscrockett5969 shoot me an email, [e-mail]

[@edwardrivera640]

Looking to build a sub box for a single cab Silverado for a 8inch sub or 10inch sub do you have any recommendations on box plans?

[@DIYAudioGuy]

That is a tight space. See if Kicker has a pre-fab that will fit.

[@pirotex2005]

Nice comparison 👍 informative

[@DIYAudioGuy]

Thanks!

[@premierdenvereventrentals9401]

Instead of one long port, can you use two ports that are half the length of a single port?

[@DIYAudioGuy]

I answered that question in this video. kzbin.info/www/bejne/eGHGooaqaLeBgZosi=X_Gx7babxJU8k6a0

[@thekidbart4528]

Where should I set my Subsonic filter if box is tuned at 36hz

[@rajeshbridgelal8105]

when designing subwoofer enclosure does the external dimensions of the port in cubic ft have to be added to cubic of the box or just the internal volume of the port?

[@DIYAudioGuy]

Net volume is just the airspace alone. Gross volume will include the airspace, the port, all of the material used to make the box and the port, and the drivers.

[@lex_parsimoniae]

Great video, thanks

[@DIYAudioGuy]

You're welcome!

[@RandoManFPV]

Laughing so hard at the types of answers I get when going to Google for audio info. I searched "is cold weather bad for your subs?" Here's what I found lol: *How do you warm up subs?* take the top off the sub, put the sub on some aluminum foil, turn your oven on broil, put your sub in the oven for like 3 minutes (just stay close by, you'll smell when it's done depending on how much stuff is on your sub), remove sub from oven, reconstruct, devour

[@DIYAudioGuy]

🤔🤣🤣🤣🤣

[@TheMichaelvolz]

I like to think of it with one of those pull whistles that you blow in and pull the bottom. The longer the vent / longer out you pull the whistle end, the lower the note. That's just to grasp the concept tho, nothing specific.

[@DIYAudioGuy]

I had never thought about that.