How does a port work? Myths Busted!

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In this video I explain how a port works, and in the process bust a few myths about the function of a port. To learn more about ports check out this video: • Everything you need to...
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lddy.no/1073r
amzn.to/3cBWis0
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Chapters:
0:00 Introduction
0:50 Myth #1
1:20 Air Has Mass
2:45 Resonating Air
3:50 Port Gain
5:25 Port Tuning Frequency
6:30 Port Airflow Demonstration
6:50 Cone Excursion
7:50 Myth #2
‪@Toid‬
*As an amazon associate marketer I may earn a small commission on qualified purchases. As an affiliate marketer I may earn a small commission when you make a purchase at Parts Express, Sonic Electronix or Down4Sound.

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Опубликовано:

30 июн 2024

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Комментарии : 694

@THE8K47 2 года назад

I started a business a year ago building custom bass boxes with 0 prior knowledge but I studied your videos and utilized all the knowledge I took from them. Now I have a solid reputation for my boxes performing perfectly

@DIYAudioGuy 2 года назад

That is awesome! Nice work.

@applejack2374 2 года назад

That's really cool! More power to ya! 👊

@eldrickejleest Год назад

This awesome..

@sonus289 Год назад

what about custom bass guitar cabs?

@fredymredy Год назад

Why some boxes have membrane instead of ooen hole?

@bennettshapiro2965 2 года назад

Great description of the beauty of the band pass design. I have rarely heard it so well articulated. Just a pleasure to watch and listen to. Some of us are old hats with some of the science, but hearing it explained succinctly and clearly is still a beautiful experience. Thanks for that.

@DIYAudioGuy 2 года назад

Thank you!

@easydiy_beginners Год назад

OMG 10 mins of non stop technical words, need hours to understand the basics of the port, wonderful explanation!! thanks for sharing the knowledge!!!

@DIYAudioGuy Год назад

Glad you enjoyed it!

@Clobercow1 2 года назад

Great video and great explanation! You're explaining this at next level and I'm certainly going to link this video when people start with the subwoofer myths!

@DIYAudioGuy 2 года назад

You are far to kind!

@wally7856 Год назад

Wow, super impressed! I've never seen so much correct information condensed into 10 minutes on audio as this. In a sea of audio half truths this was refreshing to see not a single misunderstanding of the physics/engineering of how ports operate. My background is live sound engineer/speaker builder/car audio way back when and I spend more time on the math and physics of audio that I care to admit and you hit all the bases. The only thing I would of added would be some of the pro's/cons/trade off's of ported enclosures. Things like efficiency, size, distortion vs group delay, phase, f3, harmonics.

@DIYAudioGuy Год назад

You are far too kind. As far as the pros and cons, my original plan was to make a video covering that topic. I just haven't gotten around to it yet. But you're exactly right. I need to make that video.

@nunyabusiness2127 Год назад

Great video! You covered a ton of material in a very short period. I started studying the body of work by Theil & Small in the early 1980s. I began plotting freq response charts and then building a lot of "tuned" boxes back then. Amazing how much speakers have changed since then. Would like to see you do a video on passive crossovers as well. Most folks do not understand a simple 6dB/octave let alone an 18 dB/octave x-over or when to use each.

@DIYAudioGuy Год назад

I tried reading the original papers. I don't have enough background in the subject to understand them.

@DIYAudioGuy 5 месяцев назад

I have always wondered how to the TS parameters to generate the plots. I am sure somebody out their has this posted online, or it is in a book. Can you point me in the right direction?

@jamband4230 2 года назад

This was a great video. So much information packed into a few minutes. No fluff just the facts and it was explained in simple enough terms you don’t have to be a engineer to understand this information. This is why I follow this channel. Thank you

@DIYAudioGuy 2 года назад

Thank you!

@dannylewandowski2822 Год назад

Just ported a box this weekend after watching your video! I added 3 smaller ports instead of one large one due to the size of the speaker and allowable drilling on the sub box. It sounds amazing. as I added each port 1-2-3 it got better sounding each time. I did the math and found the correct ratio to surface area and volume of the cone in order to convert to smaller ports. I see a lot of air but barely see the subwoofer speaker moving. I would say this is most efficient sound I can get out of my setup. Tuned to 59.7 hz.

@jimmiejamese.4006 5 месяцев назад

That's sweet, I was looking for information on the exact same idea, and I figured the ratios were easy to calculate. Looks like you found out it's pretty simple.

@jimjones3287 3 месяца назад

is adding an extra identical aero port the same as making the original port longer?

@jimmiejamese.4006 3 месяца назад

@@jimjones3287 it seems so theoretically, I tried a design the same way, but I didn't calculate port noise yet. I would see that as being the biggest difference, but haven't put that theory into practice yet. Did you try to search for answers online?

@bricebowlin8834 2 месяца назад

Why do you have it tuned to 60 Hertz?

@riazmoosa8320 2 года назад

Next level stuff... Love this videos... Everything Audio makes sense for a sound fanatic as myself... Keep it up...🤩

@DIYAudioGuy 2 года назад

Thank you! Will do!

@stout7668 2 года назад

So much awesome info. I always built boxes to hrtz by size I would degree the main port tunnel. From opening it up to a smaller opening or a very small opening to a larger opening. It works phenomenally well and just a few degrees makes a huge difference

@DIYAudioGuy 2 года назад

You mean like a flare. Yeah, that works great.

@rpaip 2 года назад

Excellent video! One of the best and most comprehensive overviews of bass reflex systems 👍

@DIYAudioGuy 2 года назад

Glad you enjoyed it!

@jimmyjam5588 2 года назад

Hey thank you I needed this video I'm doing a spl build for next year and this put everything into perspective, very detailed 👌 been following you for a year now and always something to learn 😀

@DIYAudioGuy 2 года назад

Glad it was helpful!

@jimmyjam5588 2 года назад

Keep up the good work

@muttBunch 2 года назад

Beautifully detailed ❤️. I’m a sealed box kind of guy and have been into car audio for over 25+ years. I remember long before “bazooka” tubes, Kicker actually made speakers back in the late 80s that were of an oblong igloo. What was amazing about that design was it include a port, but sort of a hybrid port/sealed enclosure as it came with a port plug. I’m surprised I haven’t seen them since.

@DIYAudioGuy 2 года назад

I remember those.

@hispls 2 года назад

Generally speaking a subwoofer is going to perform better in either ported or sealed alignment and even with some of the fence-sitters you'll wind up with either larger than optimum sealed or smaller than optimum ported by just plugging the port.

@beerman9807 Год назад

@@Mr.Robert1 some were , depending on model some weren’t

@beerman9807 Год назад

What was the model , I never knew and would like to see it if it’s on line

@mephInc Год назад

Port plugs are still a thing in the home theater world. Each of my 15s, for example, have 3 ports and I have the ability to plug each one. This helps with fine tuning to fit your room acoustics.

@lordhostile 2 года назад

Wow alot of good info, I never saw a port like a passive radiator before but it makes sense the way you explained it. thanks!

@DIYAudioGuy 2 года назад

Glad you liked it!

@ryanmichalski7420 Год назад

You’re educational videos are really well done. Your teaching style makes topics easier to understand.

@DIYAudioGuy Год назад

Glad you like them!

@MadLadCustoms Год назад

Wow, just found your channel. No bs straight to the point and in an understanding way for the rest of us. Subbed!

@DIYAudioGuy Год назад

Thanks.

@fredgeitner713 2 года назад

Very interesting. You explain it in a way that actually makes sense to me. Thank you.

@DIYAudioGuy 2 года назад

Glad you liked it!

@clearme2 2 года назад

Hexibase did a great job explaining port variations. This is another good example for explanation 👍🏻

@DIYAudioGuy 2 года назад

His stuff is entertaining.

@johnenglishIII 10 месяцев назад

This was excellent and helped me a lot to understand a bunch of stuff. Thanks you so much.

@Poekieman 2 года назад

It was interesting to see what's happening to both woofers and the port of an old JBL Northridge 100 at different frequencies. Both woofers are not always in phase, as I had expected. And I heard a lot of rattles and stuff resonating in all kinds of places, at different frequencies.

@DIYAudioGuy 2 года назад

Odd

@slvice14 Год назад

Dude! This was so educational, I learned so much just now! Thanks for posting this.

@djs1809 Год назад

Thank you for a very detailed and professional explanation brother, I love your passion.

@DIYAudioGuy Год назад

Thanks!

@jasonchapman2845 Год назад

I just discovered your channel. Out-effin-standing work, info, and presentation! New subscriber here!

@DIYAudioGuy Год назад

Welcome to the party.

@JAM-ur8tj 2 года назад

Excellent information and you explained it perfectly! Keep up the good content.

@DIYAudioGuy 2 года назад

You are to kind!

@JaykUS354 Год назад

Wow, I still have so much to learn! I’m tearing down the Roku wireless subwoofer and looking into using the components in a total upgrade of the woofer and enclosure… going to be a fun project!

@DIYAudioGuy Год назад

Does that subwoofer have any kind of DSP applied to it?

@JaykUS354 Год назад

I should add: a simpler project we had in mind was to splice in some RCA jacks exposed in the back of current enclosure and hook up a small external amp to power some buttkickers… that would be our main preference just given our current setup.

@ajc-th5ei 2 года назад

Great video. Erin's Audio Corner also had a talk on use of Finite Element Method for design of drivers and enclosures. In it, they mention at one point when there is a high pressure or low pressure at the surface of the cone. Aside from that recent video, there is something else I've been playing with: Changing the Qa (absorption) value in the advanced settings in the box tuning tab. With an absorption value of 20 (what Unibox and BassBox Pro use for an enclosure lined with insulation), this changes the excursion of the driver in such a way as to suggest the absorption makes the box act more like a sealed enclosure, which also allows for more power to be given to the driver before reaching X-max. That may be a fun video, discussing box absorption and the effects on different types of enclosures, rather than the standard of using it to make the Q of the box seem to approach that of a larger box. But, this means some of the negatives surrounding ported enclosures may be able to be combated through the use of insulation. Either way, love the videos. Hope you are having a great weekend.

@DIYAudioGuy 2 года назад

Definitely something to think about! At some point I'm going to do some experiments with box stuffing. Just need to do some more research and build some enclosures before I jump on that.

@BabyCharlotteschannel 2 года назад

Sounds like fun and what could certainly be an awesome learning experience! Especially since I am probably going to have to build my next box so I can have exactly what I'm looking for! My goodness I can't wait to have a Rocking system in my vehicle again!!

@Rene_Christensen 2 года назад

What I mentioned on Erin’s video is that steady state the cone moves outward and at it outermost displacement you have the lowest pressure in front of it, not the highest. A big misconception but often not of much consequence. The current video here is really good, great job.

@ajc-th5ei 2 года назад

@@Rene_Christensen - The way I remember it is thinking about the system in a ported enclosure. When the cone is at its innermost, it creates the highest potential or vacuum within the enclosure (lowest pressure) which then pulls air in to fill the low pressure as the cone moves outwards. Meanwhile, when the cone is at the outermost displacement, inside the box has the highest pressure at that point because it just filled the box and now that air is pushing back against the cone that is at its peak excursion outwards. But that is just how I think about it to keep it straight. And obviously, what is true on one side is the opposite on the other side (so when low on the inside of the enclosure, it is high on the cone on the outside of the enclosure).

@donaldglaser7686 2 года назад

I read Great Sound Stereo Speaker Manual many times cover to cover in the 90's as a teenage box builder. People were always amazed at the output of a single driver in a properly tuned ported box. Then I started building single reflex bandpasses. Same thing. I'd get 18" sound out of a single JL12W1 driver over a fairly narrow band.

@DIYAudioGuy 2 года назад

Knowledge is power.

@victorpin4957 2 года назад

Do you build for sale?

@cmosdaboss 2 года назад

Wish I knew all this 20 years ago, so many years of bass wasted. Great video bro. Lots of people don’t know and your video help people build an enclosure the right way before making a costly mistake

@DIYAudioGuy 2 года назад

👍

@travisbroughton7773 5 месяцев назад

Thank you for giving me your subwoofer knowledge

@timmyfingaz100 Год назад

Wow, I watch a fair bit of youtube tutorials and your way of explanting things is great!! Thanks for the info's!!

@DIYAudioGuy Год назад

Thanks for watching!

@fortwisers6070 Год назад

Best video I've seen on the subject without going into the math involved, great job!

@DIYAudioGuy Год назад

Glad you enjoyed it!

@SparkedEd 2 года назад

I love this, great explanation

@DIYAudioGuy 2 года назад

I appreciate you saying that.

@dragan3290 Год назад

I love your explanation! Very informative 🙂👍👍👍

@DIYAudioGuy Год назад

Thank you! 😃

@supakrunch 2 года назад

Excellent explanation of ports!

@DIYAudioGuy 2 года назад

Ports are a ton of fun.

@TheUniversalid Год назад

The humble paddleball is a representation of this. The paddle is the driver, the ball is the air inside the port (in my case, it's instead a passive radiator) the air inside the cabinet is the rubber band. In the ideal scenario, both the ball and paddle should be traveling in opposing directions for as much of the span of said desired wave, as to transmit the most energy into the action. Same as a driver and port air should do the same. The most phase offset I have seen is up to 170°, which is amazing!

@DIYAudioGuy Год назад

That is a cool trick.

@ksb916 2 года назад

Great video and lots of great information!

@DIYAudioGuy 2 года назад

Glad you enjoyed it!

@DannerPlace Год назад

Wow, this is really good stuff, thank you for posting.

@DIYAudioGuy Год назад

Glad you liked it!

@greengamerguy623 Год назад

this was very well explained thank you

@DIYAudioGuy Год назад

Glad you enjoyed it!

@shawnsanderson3695 2 года назад

The explanation is legit my man!

@DIYAudioGuy 2 года назад

Thanks!

@youngfeezy7969 2 года назад

Wow I love this explanation. Subbed!

@DIYAudioGuy 2 года назад

Welcome to the party!

@danielpierce175 Год назад

Wow, great video man.! Beyond impressed with how much knowledge you crammed into such a short video.! Had a question though, so I have a skar audio evl 65-d4 and I need to build a box.. any ideas on what to use, not to use.. dimensions etc.. Very much appreciated in advance. Keep up the exceptional work

@DIYAudioGuy Год назад

I typically model them in WinISD to figure all of that out. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yZNeYBYGRKk.html I offer design services, but I am a little busy right now (fall 2022), so I am not taking on any design clients for a few months. The easy thing to do is grab a pro-fab box. Not sure if they have one for a 6.5. lddy.no/1c0u1

@DIYAudioGuy Год назад

Looks like they do have a pro fab for a pair of 6.5's. lddy.no/1cm30

@turboduckhead6179 2 года назад

This video is jam packed full of information

@DIYAudioGuy 2 года назад

Jammed for sure.

@SS-sw8de 2 года назад

Great job man💯

@DIYAudioGuy 2 года назад

Thanks 💯

@mtj8alienartandteck867 Год назад

Dude you have been compressing .. my chamber with .. knowledgeable .. comprehensive .. notions .. tha As motions ... thank you .. Duee

@DIYAudioGuy Год назад

Happy to help

@gsxroyce256 6 месяцев назад

May i suggest an idea for a future video? Would you make a video on how you learned all this? How you got started in audio. How you got involved/ inspired/ influenced/ interested/ esc. Schooling / collage on the subject if so. (You seem professionally educated on the subject) I think it would be cool to see how you got started and what you were interested in when starting out. And the difference on the equipment from them until now. And how that effected what you know / learned. Thanks 🙏🏼

@HifiVega 2 года назад

Great info

@DIYAudioGuy 2 года назад

Thanks

@shawnsanderson3695 2 года назад

I'm already loving this one.

@DIYAudioGuy 2 года назад

Glad you liked it.

@PetarBozic 2 года назад

You just scored yourself a subscriber my good man. Amazing video, thank you!!

@DIYAudioGuy 2 года назад

Thanks!

@psyphonyxaudio 2 года назад

Air Mass - ..anyone ever been close to a Tornado know that Air can express a force / pressure. .. same with walking near a building during a windy day. ( wind tunnel ) Very nice, detailed and well explained video on the physics of how this works.

@DIYAudioGuy 2 года назад

Or just roll down one car window part of the way. Then roll down a second window a little bit and notice how the resonance stops.

@psyphonyxaudio 2 года назад

@@DIYAudioGuy - Through flow. Yes! See, I like what you've just done here. This gives most regular people who happen to enjoy audio an everyday experience that relates to how sound functions and a practical WAY to recognize and listen for in an audio specific situation.

@garethfoulkes768 7 дней назад

Love the bass use to enclosures in the 90s on my metro

@ppitowman Год назад

Ah yes, well spoken educational videos about audio, I’ve been searching for this for months

@kierenalvarez Год назад

Thanks for this video this is fantastic

@DIYAudioGuy Год назад

You're very welcome!

@halrichard1969 8 месяцев назад

I havent watched any Subwoofer building Videos for just about one year. I was determined to learn just about everything I needed to know regarding the technical aspects of it. And I did. The point is having watched your video here and a couple others of yours today I can gladly say that you have improved your video presentation in 2023, not that it was bad by any means. You are much appreciated. Your videos are music to my ears. Please keep it up.

@DIYAudioGuy 7 месяцев назад

I try to get a little better every day. I use the money provided by my patrons to (www.patreon.com/DIYAudioGuy) to upgrade camera gear, lights, microphones, software, etc...

@ChrisWard64658 2 месяца назад

I learned a lot, thanks.

@DIYAudioGuy 2 месяца назад

Glad to hear it!

@robertliskey420 Год назад

Outstanding!! If viewers look at speakers made prior to the AR-5 it brings this home big time amps were low power tube yet they thundered the speakers of the day

@DIYAudioGuy Год назад

Modern car subwoofers with their massive and stiff suspension are just not very efficient.

@icekid099 2 года назад

Based off of your explanation of port size and pressure at different frequencies would it be possibl to adjust the port length with say a consitina setup which is controlled by a stepper motor for different frequency ranges using a frequency controller, e.g. At higher frequency shorten/lengthen the port a few cm (inches - I work in metric) and then at lower frequencies adjust the port again so that the optimal Fb works over a broader range, and the effective frequency range for maximum bass range is widened? Not sure if you understand the question... I'm not technical by any means, but it sounds like a logical approach to expanding the bass range for full enjoyment without compromising choice of the size of the product. Could be overkill, but does such a active port setup exist? Should not be a massively expensive alternative in my mind. Would be interesting to hear your feedback. Very good video BTW, explaining the port logic, even for a non techie like myself!

@gordythecreator 2 года назад

@3:00 I've never heard that explanation... thanks!

@DIYAudioGuy 2 года назад

Thanks!

@stephenbailey3496 Год назад

I'm loving these videos! So much new knowledge. Does your plan for 10" Dayton sub also work with the ultimax model? Greetings from Amsterdam 👍

@DIYAudioGuy Год назад

I prefer a lower tuning for the Ultimax, and it needs a bigger speaker cut out. Otherwise it will work. It just may not be optimal.

@bass305-HCCA 2 года назад

You're an excellent teacher. 😎👍

@DIYAudioGuy 2 года назад

Thanks.

@workingclassperson2124 2 года назад

Great vid as always. I’m always learning and experimenting and learning some more. I like a 25-28 hz tune for the lows ya some day it’s a waist but I’m always changing my port tuning about every 2 months or so anyhow. Motorized port??

@DIYAudioGuy 2 года назад

I think it would be cool to build a box with a removable panel, just cut a hole in the panel and stick in an arrow port. Then you could swap out ports anytime you wanted.

@troubleship6064 2 года назад

25-28 is the life, low life. That’s where I live

@Bianchi77 2 года назад

Creative video, thanks for sharing it :)

@DIYAudioGuy 2 года назад

Thank you! Cheers!

@dilbeckskate 2 года назад

great video man

@DIYAudioGuy 2 года назад

Thanks!

@tsomer07 Год назад

We're fish swimming in our own sea! Your remarks on air pressure provided me an intuitive impression of something that before now I could only accept as theory. Thank you!

@DIYAudioGuy Год назад

Well said!

@whydotheathensrage Год назад

thanks, I am in the process of building my first box with some left over drivers tweeter/mid-range from a JBL 4412. I Have a pyle 12" blue wave woofer that i got for near nothing. This will be fun, in fact I will probable use this creation(combined with the software) as a dedicated sound physics experimental box. Thanks again, as i am sure your teachings will spare me from much trial and error.👍👍

@DIYAudioGuy Год назад

I have a good video on box building that you should check out! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-SVZ5uD_smpc.html

@whydotheathensrage Год назад

@@DIYAudioGuy thanks, I was going to .45 degree cut my box, but decided not to on my first try with a 3 way box. I decided not to go with the Pyle bass, and used a 12 inch from an l100, it sounds better combined with the tweeter and mid from the 4412👍👍

@DIYAudioGuy 2 года назад

To learn more check out this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--yopTneS7g8.html

@robertquinlan9297 2 года назад

I've owned both sealed design speakers or air suspension speakers like older Boston acoustic, and I loved the tightness and defined response of bass, was all that traded for the loudness and efficiency of ported designed speakers? Because I believe the sealed design sound a lot more pleasing.

@DIYAudioGuy 2 года назад

A lot of people like that sound.

@chef_boi_ar_teej4523 3 месяца назад

You really do give off a sub character from mythbusters and i enjoy it

@DIYAudioGuy 3 месяца назад

Your comment made my day.

@broken51N 11 месяцев назад

Thank you for showing people how to Do the Math! Win ISD is the best. You truly are a great builder and very knowledgeable. As I normally post. Do your math! Fantastic Brother!

@DIYAudioGuy 11 месяцев назад

I agree! A little math goes a long way!

@atlantajunglepythons1744 2 года назад

Such a great info-dump. Totally new to this, so trying to pick up some bits. I know you covered a lot, but as I sip information, and don't get a chance to swallow, my thimble just chokes then overflows. I'm left with a bit of the flavor, but most of the nutrition is gone (when people cover advanced topics and go _so_ fast!) I realize for much of your audience this is all 'old hat', nothing new, no need for pace-pause-repeat [[Teaching -->Learning]] because they all know it already. Hey, maybe I can watch 6 more times, keep stopping it and take notes! Meanwhile, thanks for putting the info out there.

@DIYAudioGuy 2 года назад

👍

@jimbobdobbs1597 2 месяца назад

My issue with ports- is you come to find out half the songs sound like crap and you find yourself playing the same 5 songs that sound "great" in your range, not the music you enjoy- IF you listen to actual music. Thats why i am going back to sealed box this build.

@jasonwilliamson1854 2 года назад

wow impressive and informative for sure.... im sure you get the same kind of looks when you speak with people that i do.....lol when a question is asked, is yes or no ever a response that will validate the question properly. cheers

@DIYAudioGuy 2 года назад

Ha! Truth.

@gloriawashington7876 2 года назад

Excellent

@DIYAudioGuy 2 года назад

Thanks!

@juanchernandez3129 Год назад

Awesome video!! What type of enclosure do you recommend to get some decent bass from ceiling speakers?

@DIYAudioGuy Год назад

Most of them are designed to operate free air.

@thomaslechner1622 2 года назад

The main problem is that below the tuning frequency, the port goes out of resonance and DOES cancel the speaker output. It is an acoustical short circuit at very low frequencies. That is why a lowcut is needed with a BR woofer - to not over-excite and damage the speaker.

@DIYAudioGuy 2 года назад

Yep, very sharp roll-off below tuning frequency.

@richtomlinson7090 Год назад

When I was looking to make a speaker for my Bass guitar and I had a 15" woofer from an older cabinet, I bought a book at RadioShack and started to research how I would do it. I eventually became intimidated by the math I needed to make the perfect cabinet for a speaker of relatively unknown specs, so I made a solid and airtight box with insulation stuffed into it. I learned what the tuned ports were for back around 1984 and I've cringed a little every time I have seen poorly controlled woofers, just sitting out in the open in some idiots car, and they thought their music didn't suck. I've since learned that speakers for the original production of music, can add character to the sound, and that's sort of okay, but when we want to reproduce the original sound, it really pays to have perfect well thought out speakers that produce a flatter well controlled sound that sounds like the original recording. I would like to produce some interesting speakers with tight bass, and it's probably easier now because bare speakers often come with the important information and recommendations for proper cabinet volume and design.

@wrenchhead944 2 года назад

I recently started watching your channel. First rate work , fairly easy to understand , should be very helpful . I recently started the planning stage for a low power bass cabinet (20 watts ). Being low power, efficiency will be a big deal . When installing 2 different speakers (2-4'' mid bass and a single 10'') in the same cabinet . How do you determine the port size ?

@DIYAudioGuy 2 года назад

Here is what you want: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yZNeYBYGRKk.html

@wrenchhead944 2 года назад

@@DIYAudioGuy Thank you so much

@wrenchhead944 Год назад

@@Mr.Robert1 Thanks for the input. I like to build my own stuff if I can .

@tritop Год назад

Best explanation

@DIYAudioGuy Год назад

Glad you think so!

@gizmoochi 2 года назад

Speaking of ports......any chance of doing a video explaining T-line boxws? Thanks and keep up the great work.

@DIYAudioGuy 2 года назад

There seems to be a lot of interest in it!

@ladjkaoz 6 месяцев назад

lots great info... something I keep getting lost is the octabe.. 1/8 etc... not sure what it meams...

@justlooking6898 5 месяцев назад

If you mean 'octave' and I'm not a speaker expert, then if you were to talk to a guitarist or musician, an octave, or the plateau that IS an octave above or below any pitch, is twelve notes above it, so, let's just say that an octave above 40 Hz is 80 Hz, 40 is an octave above 20 Hz, and as such. Think of Tom Sawyer by RUSH - When the bass guitar kicks in, those 2 distinct, XXX-X....notes are an octave apart - They sound the same but are so different in frequency. '18 dB per octave'? That would mean 'that much over that far' if it were about an EQ or bass dropoff in response, etc. Hope I helped. Need more BV and Coke! 🤪🤪🤪

@RenLacerda Год назад

Just wanted to find out what those tubes on my speaker do. This video got me more confused than when I started! 😂😂

@rrios283s73 Год назад

😅🎉

@jeremycravens6973 Год назад

Wow! How many years of school did it take to learn all that! Damm that was a lot of information! Thanks!

@DIYAudioGuy Год назад

100% self taught.

@narmale Год назад

i JUST made the connection between the sub and the port listening to you talk about the "not a fan, because its pushing and pulling" so the port is 101% tied to the T&S of the speakers due to Vas, Fs, BL and MMS... all have a direct effect with the port, both shape and length are affected by each other due to the interaction of air molecules inside the port, change the length and shape, you just changed everything about it

@DIYAudioGuy Год назад

Yep, it is an interesting bit of physics!

@narmale Год назад

@@DIYAudioGuy i just never made the connection, easy way for newbies to think of it would be the air acts like a passive radiator... only not solid... but gas particles

@mickduprez9598 2 года назад

Quick question if I may? This is more of an experiment to try with some typical 15" + horn passive PA speakers enclosures (plastic...), I was wondering if I could 'tune' an enclosure to get the best mid range from the front of the cone into a horn say and maximise the bass frequencies using a port or horn or combination of both? Maybe using a 4th or 6th order setup? Enclosure size isn't a problem within reason :) I'd use a standard style horn for the tweeter. I would like to achieve a bigger bass and keep the mids with a better spl for smaller outdoor gigs (the bass disappears outside!) without having to setup our big rig that requires lots of watts(amps) using what I have to hand. Not asking for much am I :D Your vid's are great and I'm just getting started into them, a lot to learn, thanks and cheers

@DIYAudioGuy 2 года назад

I don't know enough about horns to really help you with that. I suggest that you check out my buddy Nick he is a true guru when it comes to home speakers. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RQlrNc3qqnw.html

@davebing11 Год назад

once you get beyond 4th order, it gets very difficult to measure all of the parameters involved, and they all change with spl loads, ageing, and probably even moon phase.

@djs1809 Год назад

Thanks!

@DIYAudioGuy Год назад

Thank you!

@THESUBZILLA 2 года назад

good video!

@DIYAudioGuy 2 года назад

Thanks.

@turdfurgason8476 2 месяца назад

Awesome information. No BS either. 🎉

@DIYAudioGuy 2 месяца назад

Thanks!

@TimpBizkit 2 года назад

There's actually 2 resonances. One around the mid band where the driver is moving the most and the port and driver are in phase. This happens from a combination of the driver springing against its share of air in the box and the port springing against its share of air (I'm not sure how this air is divided but it is some fraction that changes with speaker parameters, box sizes and tunings). The second resonance is that of the port springing against almost all the air in the box and the driver barely moving. The port output will be 90 degrees behind the output of the back of the speaker (or 270 behind the front). The net 90 degree phase is still additive, especially when the port is making most of the sound. You can actually see two resonances with a mass on a spring and your hand. One where your hand moves up and down a lot and the weight does the opposite of your hand. The other where the weight does most of the motion and your hand moves only enough to make up for losses and may as well be a fixed point. Below the tuning, the port will be making some sound but will begin to act like a leak in the box, meaning the driver will act like it is in free air. In fact it resonates even more at very low frequencies due to the momentum of the air in the box and the port increasing the effective moving mass of the speaker. You can damage your speaker if it's playing too loud down there. I have pa subwoofers that are tuned between 35 and 40 Hz depending on boundary loading and they can move like crazy at 10-15 Hz with just a handful of watts.

@DIYAudioGuy 2 года назад

Yes, I've only barely scratched the surface in this video.

@topixfromthetropix1674 Год назад

I suppose I'm a DIY guy, too. I built a sound system that could play to 50,000 people. Although people have transmigrated through a lot of sub-woofers, we worked with the old JBL single 18" folded horn ported speaker enclosure. When stacked in a 4 X 2 configuration, it goes to 40 CPS almost flat. It only occupies 16' to 20 feet of wing space in a coliseum stage and sounds as tight as JBL L200 studio monitors.

@DIYAudioGuy Год назад

Impressive!

@dudders___1684 Год назад

From my experience, with a 12 inch kicker sub, I’ve tried both ported and non ported. Non ported hit harder the the system I have and there’s a lot more resonance. Maybe the ported box I tried was made for a lot more power, idk

@johnnycarter6196 Год назад

I am doing now a x2 12 inch Kickers L5, and DIY a ported box with a port in the middle. I had one of them in a sealed box, and sound was good, but heard same speaker in a ported box, and the sound and bass was 10 times more intense and deep then mine. So now i building it.

@lyricalcoma1979 Год назад

Dude I’m 2 mins into this video and still understand what the heck your talking about, great job I’m quite simple so I’m gonna keep watching and I’m sure I’ll learn something 🎉

@DIYAudioGuy Год назад

Thanks.

@leiferickson3183 2 года назад

Mind Blown. Crystal clear description. Thanks!

@DIYAudioGuy 2 года назад

Good! I was not sure if I was being clear.

@larrygaines7462 Год назад

I decided to go with pre cut 2x4 3/4 in mdf same 11.75 for top and sides ,bottom center. 18 in daytons 3.75 cuft per driver. Plate amp 500w dayton. On rollers 4 in off floor. Killer bass 90 to 18 hertz. Make sure to use lots of stuffing. I also put 3/8 in bolts (8) around the woofers to compress the whole cabinet ie increase rigidity. Trying new grs planer tweeter soon with cast frame usher 8 in carbon fiber towers I did DIY in 1968..

@DIYAudioGuy Год назад

Awesome!

@larrygaines7462 Год назад

Dual monoblock tpa3255 amps for towers @ 38v. Attention to details , research and carefully choosing drivers, with eq in phone , and good signal, quiet cables and short distance from amplifier to speakers all add up . I have retired and work in wheelchair. It helps the pain of a 68 year old diabetic heart amputee.. Love music loud Love to praise the Lord ....

@larrygaines7462 Год назад

Rustnoilum 'leather' color with epoxy coat makes a perfect finish that looks like no other and tough

@Domaudeo 8 месяцев назад

You should try a comparison between a cheap woofer in a premium, well made box vs. a premium woofer in the cheapest box you can buy, just to see how good the cheap sub can be when used in the best conditions.

@johnviera3884 2 года назад

Best and most digestible explanation I’ve ever heard.

@DIYAudioGuy 2 года назад

Thank you!

@jamesconnors5653 Год назад

Thank you.

@DIYAudioGuy Год назад

You're welcome!

@psyphonyxaudio 2 года назад

....Also.... Could you perhaps do a video like this about Transmission Line designs? I think there are very few ..and letting people know why that is .. or how it works differently could be of value to Audio fans. =)

@DIYAudioGuy 2 года назад

I have downloaded hornresp, as soon as I get it figured out I will post a video.

@psyphonyxaudio 2 года назад

@@DIYAudioGuy ...🙏🙏🙏.. Ive heard details that lead me to think its a pain in the ass... butt I think it'll be worth while.. I mean.. PMC thinks so..

@killabee623 2 года назад

I flip my speaker box cone facing up, place some rice on the cone and play a test tone. When the rice stop moving that's my tuning frequency.

@DIYAudioGuy 2 года назад

Yep!

@SpeedBoosted136 11 месяцев назад

Perfect explanation, thank you a lot! Question - so actually every ported box adds additional extra power(pressure) around that Fb? And does this mean that best option for SQ and linear output is to go with sealed box?

@DIYAudioGuy 11 месяцев назад

People have been debating that for decades. I prefer ported since you can tune it flat with great low-end extension. Sealed enclosures don't have great low end extension. If you want to go sealed for sound quality then you will want a huge subwoofer and a DSP so you can shape the sound to get the low end extension.

@SpeedBoosted136 11 месяцев назад

@@DIYAudioGuy learned from you a lot. Thanks for doing a great job ! :)

@markfischer3626 8 месяцев назад

The best tool for understanding woofer enclosure performance is Newton's second law of motion applied to forced oscillation. In this equation three factors are important, moving mass, damping factor, and spring constant. In a ported design the port acts like a pipe in a pipe organ tuned to one frequency. The same is true for wind instruments, reeds and horns. You change the notes by changing the length of the air column. At the tuned frequency air moves easily through the port. Half an octave higher and lower air won't move easily through the port at all. So at the tuning frequency there is low back pressure resistance to air moving and the cone continues to vibrate for awhile. Light cone weight tend to reduce this effect but lack of strength leads to breakup of the cone into harmonic modes called Bessel functions like the membrane of a drum. The spring constant and damping factor are largely controlled by a fairly tight outer suspension and the spider. Differences in restoring force varying circumferential tends to twist the cone while differences in force radially tend to shear it. Therefore the spring force and damping factor vary with both frequency and amplitude. IMO it's not a good design. Not all sealed speakers are acoustic suspension which should have been called pneumatic suspension. Those which are and are optimized overcome these problems. Further advantages are explained by the ideal gas laws.

@oliverj1428 11 месяцев назад

Great video, thanks. I'm an acoustic guitar builder wishing to lower the resonant frequency of my bass guitars. By adding port tubes to my last instrument, it lowered the frequency from 58.6 Hz to 49.8 Hz. Ideally it would be 41Hz to cover the range of the lowest string. Given that a guitar body has rigid sides/back and a flexible top, can the principles of speaker cabinet design be used to optimize this system?

@DIYAudioGuy 11 месяцев назад

I have no idea! But I am intrigued by the question. Porting a bass guitar! If you can figure out how to make that work it will be a game changer.