How does a port work? Myths Busted!
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День томуIn 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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Links* to products used in the video
Subwoofers:
howl.me/cg0totF3HI1
parts-express.sjv.io/DVNOay
parts-express.sjv.io/e4Wejg
amzn.to/3qXEy2J
Ports: parts-express.sjv.io/NKqRmV
Subwoofer Enclosures:
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.
@THE8K47 Рік тому
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 Рік тому
That is awesome! Nice work.
@applejack2374 Рік тому
That's really cool! More power to ya! 👊
@eldrickejleest Рік тому
This awesome..
@sonus289 Рік тому
what about custom bass guitar cabs?
@fredymredy Рік тому
Why some boxes have membrane instead of ooen hole?
@bennettshapiro2965 2 роки тому
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 роки тому
Thank you!
@easydiy_beginners Рік тому
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 Рік тому
Glad you enjoyed it!
@nunyabusiness2127 Рік тому
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 Рік тому
I tried reading the original papers. I don't have enough background in the subject to understand them.
@DIYAudioGuy 3 місяці тому
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?
@muttBunch Рік тому
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 Рік тому
I remember those.
@hispls Рік тому
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 Рік тому
@@Mr.Robert1 some were , depending on model some weren’t
@beerman9807 Рік тому
What was the model , I never knew and would like to see it if it’s on line
@mephInc Рік тому
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.
@jamband4230 2 роки тому
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 роки тому
Thank you!
@wally7856 Рік тому
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 Рік тому
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.
@dannylewandowski2822 Рік тому
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 3 місяці тому
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 Місяць тому
is adding an extra identical aero port the same as making the original port longer?
@jimmiejamese.4006 Місяць тому
@@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 21 день тому
Why do you have it tuned to 60 Hertz?
@Clobercow1 2 роки тому
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 роки тому
You are far to kind!
@stout7668 Рік тому
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 Рік тому
You mean like a flare. Yeah, that works great.
@Poekieman Рік тому
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 Рік тому
Odd
@jimmyjam5588 2 роки тому
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 роки тому
Glad it was helpful!
@jimmyjam5588 2 роки тому
Keep up the good work
@clearme2 2 роки тому
Hexibase did a great job explaining port variations. This is another good example for explanation 👍🏻
@DIYAudioGuy 2 роки тому
His stuff is entertaining.
@donaldglaser7686 2 роки тому
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 роки тому
Knowledge is power.
@victorpin4957 2 роки тому
Do you build for sale?
@johnenglishIII 8 місяців тому
This was excellent and helped me a lot to understand a bunch of stuff. Thanks you so much.
@ajc-th5ei 2 роки тому
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 роки тому
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 роки тому
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 роки тому
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 роки тому
@@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).
@rpaip 2 роки тому
Excellent video! One of the best and most comprehensive overviews of bass reflex systems 👍
@DIYAudioGuy 2 роки тому
Glad you enjoyed it!
@lordhostile 2 роки тому
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 роки тому
Glad you liked it!
@cmosdaboss 2 роки тому
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 роки тому
👍
@riazmoosa8320 2 роки тому
Next level stuff... Love this videos... Everything Audio makes sense for a sound fanatic as myself... Keep it up...🤩
@DIYAudioGuy 2 роки тому
Thank you! Will do!
@MadLadCustoms Рік тому
Wow, just found your channel. No bs straight to the point and in an understanding way for the rest of us. Subbed!
@DIYAudioGuy Рік тому
Thanks.
@ryanmichalski7420 Рік тому
You’re educational videos are really well done. Your teaching style makes topics easier to understand.
@DIYAudioGuy Рік тому
Glad you like them!
@fredgeitner713 2 роки тому
Very interesting. You explain it in a way that actually makes sense to me. Thank you.
@DIYAudioGuy 2 роки тому
Glad you liked it!
@slvice14 Рік тому
Dude! This was so educational, I learned so much just now! Thanks for posting this.
@JaykUS354 Рік тому
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 Рік тому
Does that subwoofer have any kind of DSP applied to it?
@JaykUS354 Рік тому
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.
@fortwisers6070 Рік тому
Best video I've seen on the subject without going into the math involved, great job!
@DIYAudioGuy Рік тому
Glad you enjoyed it!
@djs1809 Рік тому
Thank you for a very detailed and professional explanation brother, I love your passion.
@DIYAudioGuy Рік тому
Thanks!
@jasonchapman2845 Рік тому
I just discovered your channel. Out-effin-standing work, info, and presentation! New subscriber here!
@DIYAudioGuy Рік тому
Welcome to the party.
@travisbroughton7773 3 місяці тому
Thank you for giving me your subwoofer knowledge
@danielpierce175 Рік тому
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 Рік тому
I typically model them in WinISD to figure all of that out. ukposts.info/have/v-deo/sYp_mY95kH2DrJ8.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 Рік тому
Looks like they do have a pro fab for a pair of 6.5's. lddy.no/1cm30
@timmyfingaz100 Рік тому
Wow, I watch a fair bit of youtube tutorials and your way of explanting things is great!! Thanks for the info's!!
@DIYAudioGuy Рік тому
Thanks for watching!
@JAM-ur8tj 2 роки тому
Excellent information and you explained it perfectly! Keep up the good content.
@DIYAudioGuy 2 роки тому
You are to kind!
@TheUniversalid Рік тому
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 Рік тому
That is a cool trick.
@psyphonyxaudio 2 роки тому
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 роки тому
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 роки тому
@@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.
@gsxroyce2506 4 місяці тому
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 🙏🏼
@stephenbailey3496 Рік тому
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 Рік тому
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.
@shawnsanderson3695 2 роки тому
The explanation is legit my man!
@DIYAudioGuy 2 роки тому
Thanks!
@workingclassperson2124 2 роки тому
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 роки тому
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 роки тому
25-28 is the life, low life. That’s where I live
@robertquinlan9297 Рік тому
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 Рік тому
A lot of people like that sound.
@icekid099 2 роки тому
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!
@SpeedBoosted136 9 місяців тому
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 9 місяців тому
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 9 місяців тому
@@DIYAudioGuy learned from you a lot. Thanks for doing a great job ! :)
@wrenchhead944 Рік тому
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 Рік тому
Here is what you want: ukposts.info/have/v-deo/sYp_mY95kH2DrJ8.html
@wrenchhead944 Рік тому
@@DIYAudioGuy Thank you so much
@wrenchhead944 Рік тому
@@Mr.Robert1 Thanks for the input. I like to build my own stuff if I can .
@mtj8alienartandteck867 Рік тому
Dude you have been compressing .. my chamber with .. knowledgeable .. comprehensive .. notions .. tha As motions ... thank you .. Duee
@DIYAudioGuy Рік тому
Happy to help
@robertliskey420 Рік тому
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 Рік тому
Modern car subwoofers with their massive and stiff suspension are just not very efficient.
@juanchernandez3129 Рік тому
Awesome video!! What type of enclosure do you recommend to get some decent bass from ceiling speakers?
@DIYAudioGuy Рік тому
Most of them are designed to operate free air.
@greengamerguy623 Рік тому
this was very well explained thank you
@DIYAudioGuy Рік тому
Glad you enjoyed it!
@tsomer07 Рік тому
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 Рік тому
Well said!
@turboduckhead6179 2 роки тому
This video is jam packed full of information
@DIYAudioGuy 2 роки тому
Jammed for sure.
@vincentpereira8416 9 місяців тому
I want to build 2 speaker boxes for outdoor activities and I want to use 2 15" subwoofers for each box with 2 midrange speakers and tweeters in each box how box should the box be ty
@DIYAudioGuy 9 місяців тому
That's a question for Toids DIY. That kind of build is right up his alley, you can join his forum and find helpful people that can help you figure out how to do it.
@DannerPlace Рік тому
Wow, this is really good stuff, thank you for posting.
@DIYAudioGuy Рік тому
Glad you liked it!
@supakrunch 2 роки тому
Excellent explanation of ports!
@DIYAudioGuy 2 роки тому
Ports are a ton of fun.
@newENIO11 8 днів тому
I simulated a dayton woofer in Speaker Box lite. But the diameter of the port is a bit odd. The closent diameter of tube i can find is about 3mm wider. Would that be ok? Is there a tolerance for speaker port size? TIA
@ahayward6002 2 роки тому
Hello, what type of box would you recommend for two kicker L7 8” subs? I listen to all types of music and I want to hear every detail possible. And, how much do you charge for the cut sheet of that box? Thanks
@DIYAudioGuy 2 роки тому
Reach out to @MBEnclosures, he is the expert on a box for the L78.
@dragan3290 Рік тому
I love your explanation! Very informative 🙂👍👍👍
@DIYAudioGuy Рік тому
Thank you! 😃
@RenLacerda Рік тому
Just wanted to find out what those tubes on my speaker do. This video got me more confused than when I started! 😂😂
@rrios283s73 Рік тому
😅🎉
@oliverj1428 9 місяців тому
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 9 місяців тому
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.
@drs-Rigo-Reus 2 роки тому
I have a set of bass bases for a couple of monitors. These are 15 liter closed Boxes. With Vifa M18WO, which lend themselves to ported and langer boxes. Would they thus more present?
@DIYAudioGuy 2 роки тому
That enclosure seems to be way too small to make good bass.
@ronnieorr10 9 місяців тому
Great video .. What state are you located in?
@mickduprez9598 2 роки тому
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 роки тому
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. ukposts.info/have/v-deo/ioGdpoSaaqeiz6s.html
@davebing11 Рік тому
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.
@halrichard1969 6 місяців тому
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 5 місяців тому
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...
@PetarBozic Рік тому
You just scored yourself a subscriber my good man. Amazing video, thank you!!
@DIYAudioGuy Рік тому
Thanks!
@jakefriesenjake Рік тому
I've got some krk rokit 8's, and they do go loud enough, but usually I have to turn it down because at some higher frequencies, while playing guitar, they start to unload and the 8" woofer starts to over-excursionate-ify. Should I get bigger pa speakers or is there a fix? If I start to adjust the bass using eq's and or hp filters, the guitar doesn't sound as nice or powerful...... Any suggestions?
@DIYAudioGuy Рік тому
Sounds like you need a bigger speaker.
@jakefriesenjake Рік тому
@@DIYAudioGuy yeah, looking at a used pair of Yorkville YX10P. They are 10". Going to see if I can rent the same type from a music store, before I buy them.
@acerhanslee1269 11 місяців тому
Can you give me advice if what's good design for a Hard Kick bass??? Cause here in the Philippines we commonly use Cerwin Vega Design, and mostly are modified... What should we do to make it more better like more harder and can give more output power?? And should we try to put port in the cover or at the back part of the speaker? Cause it's an enclosed type of design. Your reply will be much appreciated, Thanks!
@thomaslechner1622 Рік тому
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 Рік тому
Yep, very sharp roll-off below tuning frequency.
@richtomlinson7090 Рік тому
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.
@ppitowman Рік тому
Ah yes, well spoken educational videos about audio, I’ve been searching for this for months
@jdavibedoya 6 місяців тому
Is there any difference between the resonance frequency of the port itself and the resonance frequency of the system (i.e., the box plus the port)? I have come across some texts that describe them as distinct frequencies. Thanks for your help!
@DIYAudioGuy 6 місяців тому
That is a great question, join us on our next live show and we will try to give a detailed answer: bit.ly/3PYKG5P
@atlantajunglepythons1744 Рік тому
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 Рік тому
👍
@shawnsanderson3695 2 роки тому
I'm already loving this one.
@DIYAudioGuy 2 роки тому
Glad you liked it.
@youngfeezy7969 2 роки тому
Wow I love this explanation. Subbed!
@DIYAudioGuy 2 роки тому
Welcome to the party!
@focusinc4266 2 роки тому
please give your opinion on my plan. I'm looking for loud and low. 4.4 cubic foot box. (1 Memphis MOJO 15 4ohm) for my 2door tahoe. I'd love to have a nice clean bottom end. I'm thinking Ported but love sealed boxes
@DIYAudioGuy 2 роки тому
If you want loud and low then go with ported.
@narmale Рік тому
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 Рік тому
Yep, it is an interesting bit of physics!
@narmale Рік тому
@@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
@ladjkaoz 4 місяці тому
lots great info... something I keep getting lost is the octabe.. 1/8 etc... not sure what it meams...
@justlooking6898 3 місяці тому
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! 🤪🤪🤪
@jamesfair9751 3 місяці тому
So a subsonic filter can help from playing to low of frequency and bottoming out your subs in a ported box. Is it true that a sealed enclosure wouldn’t need a subsonic filter to be set since there is no port to push all the air out and therefore you always have that air suspension on the subs?
@whydotheathensrage Рік тому
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 Рік тому
I have a good video on box building that you should check out! ukposts.info/have/v-deo/i4aLaat7lqme0Zc.html
@whydotheathensrage Рік тому
@@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👍👍
@royrogers7644 6 місяців тому
Interesting video! But i have a question. Why does for example a 12" speakermembrane with heavy mass produce deeper bass than another 12" speaker with a lighter membrane? both membranes swing +- 1 Inch, but the heavy one goes deeper in bass right?..
@DIYAudioGuy 6 місяців тому
Probably because the ones with heaver cones also have bigger magnets and voice coils.
@royrogers7644 6 місяців тому
Hmm sounds logical but i have JBL speakers with the same magnetmotor/basket and the heavy membrane GTI series goes deeper down in bass than the PA edition with lighter membrane... anyway, the membrane weight should not affect the bass then, if the "motor" is the same on both speakers?@@DIYAudioGuy
@Domaudeo 6 місяців тому
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.
@gordythecreator 2 роки тому
@3:00 I've never heard that explanation... thanks!
@DIYAudioGuy 2 роки тому
Thanks!
@jesusledesma8960 Рік тому
to calculate the port based on the frequency it is done based on the total volume of the internal box. If I have a port of 8inch round and my box has an internal volume of 3.8 cubic feet at 37hrz the port is 20" long, or to tune a 37hrz I need to add the port displacement + 3.8?
@DIYAudioGuy Рік тому
Correct.
@topixfromthetropix1674 Рік тому
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 Рік тому
Impressive!
@lambo25 Рік тому
Great science video Mr. DYI. I have an H2 Hummer and want to feel the sound pressure of deep bass. I'm not looking for competition but want to feel the bass pressure not just hear it. This is the equipment I am thinking of getting. Subwoofer = Skar Audio VXF-12 D2 12" 3000 Watt Max 1500 Watts RMS Power Dual 2 Ohm Amp = Sundown Audio SFB-1500D Monoblock Amplifier 1500 Watts RMS Box = ported Box. Maybe i can future-proof and get Sundown Audio SFB-5000D Monoblock Amplifier 3200 Watts RMS. If I plan to get a second subwoofer later on. What do you think? Will one 12-inch at 1200 to 1500 watts give me the Bass pressure I want to feel? Thanks Carlos Exotic
@jacosta5580 Рік тому
You want a pair of 15s in a sealed box with a hellafied amp.
@broken51N 9 місяців тому
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 9 місяців тому
I agree! A little math goes a long way!
@LostSoulsMed. Рік тому
Will it work if I parallel two identical subwoofers, but put it in 2 different 4order bandpass enc. box that the ports of each is tuned in different frequency range i.e. one is tuned to 20hrz and the other is at 60hrz?
@DIYAudioGuy Рік тому
It can work, but it would be a lot of trouble to get it right.
@TheDarmach 3 місяці тому
About the lower end of frequency spectrum you mentioned, I've been looking for cheap subs, and noticed that some of these specify lower limit as 50 or even 60 Hz. Isn't this very high for 8" diameter sub? Or are these manufacturers the rare example of cheap manufacturer posting real specs? (Taga TSW-60 vs Jamo 210 )
@DIYAudioGuy 3 місяці тому
That number means nothing, it is just marketing.
@matk22 Рік тому
I need some advise. Does this sound right for the box spec I'm gonna build a box for two 15s with 31.5hz tuning. The specs call for 35hz but going slightly lower since the overall box size will be 0.3cuft under spec. The box size is 39" wide, 23" deep 23" high With a 4inch slot port 21inch high 24inch long
@DIYAudioGuy Рік тому
diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html
@chef_boi_ar_teej4523 Місяць тому
You really do give off a sub character from mythbusters and i enjoy it
@DIYAudioGuy Місяць тому
Your comment made my day.
@johnviera3884 2 роки тому
Best and most digestible explanation I’ve ever heard.
@DIYAudioGuy 2 роки тому
Thank you!
@gizmoochi 2 роки тому
Speaking of ports......any chance of doing a video explaining T-line boxws? Thanks and keep up the great work.
@DIYAudioGuy 2 роки тому
There seems to be a lot of interest in it!
@ksb916 2 роки тому
Great video and lots of great information!
@DIYAudioGuy 2 роки тому
Glad you enjoyed it!
@KEVLERPRO Рік тому
HI, what should the right port tuning freq. for the outdoor pro subwoofer?
@DIYAudioGuy Рік тому
What do you mean? Like a PA or concert system at an outdoor venue? I am not really sure, I mostly stick to home theater and cars. But the exact frequency will depend on the speaker.
@SparkedEd 2 роки тому
I love this, great explanation
@DIYAudioGuy 2 роки тому
I appreciate you saying that.
@mikebass2700 3 місяці тому
I'm a newbie at home theater and have a question. I have a vented port on my sub and have "chuffing". Will the polyfill reduce the amount of chuffing? Thx and enjoyed your vlog!
@DIYAudioGuy 3 місяці тому
Probably not, the port needs to be larger. One option is to turn the sub so that the port faces a wall, then the chuffing may not be audible.
@larrygaines7462 Рік тому
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 Рік тому
Awesome!
@larrygaines7462 Рік тому
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 Рік тому
Rustnoilum 'leather' color with epoxy coat makes a perfect finish that looks like no other and tough
@bass305-HCCA Рік тому
You're an excellent teacher. 😎👍
@DIYAudioGuy Рік тому
Thanks.
@wiredperformance6130 Рік тому
What about kerfing the port? How about if port in the middle so both sides are kerfed? Or does kerfing have 0 effect and just look pretty? I’ve tried getting a better understanding of kerf ports but I can’t find much. I kerf most enclosures and ports if the enclosure is visible. Thanks for all the info! Excellent video about how ports work!
@DIYAudioGuy Рік тому
Kerfs are just flares. Flares let you use a port with a smaller cross section, which means you can use a shorter report.
@Carson316 9 місяців тому
If your port is being blocked does it reduce proformance? ( I have a dual 12 build, my port is facing towards the back of my seats with little to no room left between the seat and the box.
@DIYAudioGuy 9 місяців тому
Yes, but, seats are not brick walls so sound does make it through. If you can move the box (even just to test it) try moving and seeing if there is a difference.
@jasonwilliamson1854 Рік тому
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 Рік тому
Ha! Truth.
@SS-sw8de 2 роки тому
Great job man💯
@DIYAudioGuy 2 роки тому
Thanks 💯
@TimpBizkit 2 роки тому
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 роки тому
Yes, I've only barely scratched the surface in this video.
@kierenalvarez Рік тому
Thanks for this video this is fantastic
@DIYAudioGuy Рік тому
You're very welcome!
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