Making A Quadratic Diffuser From Plywood - Acoustics
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- Опубликовано: 1 окт 2024
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I know I didn't exactly say what a quadratic diffuser does in this video, but I did in the project build article: ibuildit.ca/pr...
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I know I didn't exactly say what a quadratic diffuser does in this video, but I did in the project build article: ibuildit.ca/projects/how-to-make-a-quadratic-diffuser/
My Speakers and Audio channel: ruclips.net/channel/UCzGbp-rRVNwyFhn9gHoZr5g
Did this treatment to my audio room a few years ago and it made a WORLD of difference. Did a bi-directional though out of reclaimed wood and because I use bipolar speakers the placement was super critical.
ruclips.net/video/IqBWaXpyad0/видео.html
Ah yes, the old quadratic diffuser. That takes me back to when I was a younger man when I was first introduced to one.......about 7 minutes ago.
Haha, funny guy.
People are still waiting to find out what a quadratic diffuser is.
I think it's quite obvious that it diffuses, much like other diffusers, but in a quadratic way. You're welcome.
@@keithklassen5320 Rhombohedric sound will become quadratic sound upon seeing the diffuser. Got it.
@@stianyttervik9070
What if I fill it with marshmallows will that help?
@@garyoldham4449 no! You must use circus peanuts to achieve maximum diffusion in a quadratic orientation. Marshmallows will result in a quintuplic symbiosis. Definitely not the effect we are going for here.
By far the scariest use of a table saw I have seen in a long time. Use a push stick!
Sketched me out for sure
I was waiting for a push bar or a lost finger.
Glad I'm not the only one. Those things scare the bejaysis out of me...
And the push stick was laying on the fence. Apparently it was only used for another video “How to make a push stick you won’t use”.
Here we go again...seek life elsewhere
I really thought it was going to tell how it works and what it does
Okay, so what he is making is more likely a quadratic residual diffuser. The math is way over most of our heads but the basic premise is most rooms are not designed with sound in mind so they echo badly and those echos ripple back and forth and that lowers the detail of the sound at your ears. Worse all rooms have a harmonic value which means you can actually get a type of mechanical feedback at the right (or wrong) frequency. So, if you understand the math involved you can calculate the wave lengths which are problematic and design passive diffusers which reduce the echos so that the sound reaching your ears is clearer from any given angle. Or at least that is the way I understand the concept.
Agreed. I mean you should be able to expect any question asked IN THE TITLE to be answered in the video.
@@richardtroell6407 Seems like a good hypothesis Richard. Looking at other places for an explanation (which fail miserably in 'lay man' terms). It seems like the halfway point between an anechoic chamber and a very echoey room (like a squash court). Anechoic chambers are the exact opposite of the 'squash court', they deaden all frequencies and sound doesn't sound right or natural. In a squash court you can't talk with a normal voice for the echo. So maybe they're tuning a room to the range of frequencies they want to use.
From the video description and my opening comment pinned at the top of the feed:
"I know I didn't exactly say what a quadratic diffuser does in this video, but I did in the project build article: ibuildit.ca/projects/how-to-make-a-quadratic-diffuser/"
@@JohnHeisz Ok, thanks for the link.
The quadratic residue diffusor or Schroeder diffusor (Schroeder was the scientist who pioneered the development) is typically a box made with a number of wells of different, carefully chosen depths. As a sound wave strikes the irregular surface, instead of bouncing off it like a mirror, it bounces out of each well at a slightly different time. The result is many small reflections spread out in both time and space making is a richer, livelier sound with an enhanced sense of space. Listeners claim that the panels seem to make the walls disappear.
Thumbs down. The teaser that was designed to get me to watch said I would find out what a quadratic diffuser is. That did not happen. I wasted my time watching this.
Well at least you got to see one. Follow the link in the description if you want to know how it improves the acoustics of the room.
Loved the flat painters pad for Poly application! So much so, I'll give my tip: keep some Poly in a ketchup bottle and you'll be quick in applying it by squirting it out. It maximizes working time, since it's not evaporating in an open container such as any pan or even just the original container, and you can just squirt in front of your brush and work very quickly rather than go back and forth from can to surface.
Won't beat your pad for large areas like an entire sheet, but perfect for smaller applications you'll be brushing, and you'll find it doesn't go bad with the nib top on: I've pulled it off the shelf 6 months later and after a good shake, it's fully ready to go!
No explanation of dimensions or reasoning for sizing or numbers of wells.
I did a glue-up yesterday for the first time with "polyurethane construction adhesive". Felt like a John Heisz apprentice! haha
I've never seen that stuff before in any hardware store. Silicone, acrylic sealant, extreme high temp silicone, but none of that, weird.
@@Yonatan24 liquid nails
It's not Liquid Nails. Liquid Nails is a different, much less strong adhesive.
@@Yonatan24 Loctite has one:
www.loctiteproducts.com/en/products/build/construction-adhesives/loctite_pl_premiumpolyurethaneconstructionadhesive.html
Look for PL premium. It’s good stuff and widely available
you cutting wood gives me anxiety lol. kept waiting for you to lose a thumb
Same here, sooner or later...
He had a push stick literally right next to his hand too!
If you watch the video he is obviously looking at what he is cutting and concentrating very intently. This may give you anxiety but when you are using power tools you need to know exactly what will happen with certain equipment and certain materials with certain procedure. He is standing to the left of the blade so kick back although rare on a proper square setup can happen but in his case he might bruise his thumb but the piece would pass his abdomin to the right. If you watch his fingers they follow the fence and his thumb looks like a straight straight thumb. I have a double jointed thumb and big hands that in cutting a 3" strip could be a problem if not carefull. Anyway, I digress. This is my first time watching this man but he appears to know what he is doing and not drinking or on drugs. Please save your aniety for something else he will be fine and he is not an a fool or idiot either like obamareallysuucks says even if I agree with that!
@@paulkitchen5802 making an excuse for bad practices is how you lose fingers and get hurt. you can justify it how ever you want. when you are pushing wood through a table saw with your hand that close to the blade all it takes is a sneeze and you are making a trip to the emergency room.
@@paulkitchen5802 ruclips.net/video/qSbS5zhH7cE/видео.html
These are often called 2D diffusers because they only scatter the sound to the left and right. I would suggest you add bass absorbing material behind them. I’m curious to see the other treatments you have planned for this room. Should be interesting.
This is amazing content, this is the two of my hobbies, woodworking and make acoustic boxes, actually I start to woodworking to make some mdf boxes for my car...
Best thing about this video? Finding out that I also don’t have to be able to make pretty sketch ups to make nice functional pieces... thanks you!
ruddy clickbait! "whats a quadratic diffuser?" watched the video and no explanation of what one is, or what it does.
When sound travels across a parking lot and bounces off a brick building the echo is pretty quick. Speed of sound. In a small room the echo is extremely quick and it messes up what you hear. Diffuser has pockets of different depths so the timing of the reflections is not all at once so there is less distortion. By distortion I don't mean rock guitar distortion I just mean distortion of the true sound. The distortions occur because the waves interfere with each other. You hear the first sound and you hear the reflected sound mixing with it. The air in the room is vibrating so imagine if the initial sound is trying to pull the molecules but the reflected sound is trying to push them. if those two forces are equal the molecules won't move at all. Like the rope won't move when the forces of tug of war are equal. Like if you are above a planet you will fall. If you are midway between two planets of equal gravity you won't move at all. Now imagine if the initial sound is trying to push air molecules in a direction and the reflections are trying to pull them in the same direction. Then that particular vibration will have a double dose of energy it will sound louder than it was meant to sound in the original recording. That is distortion of the truth. A particular frequency could be reduced or it could be boosted by the interaction of the original sound with the reflected sounds which are coming from all directions. The sound loses energy when it bounces off a wall. It might only be 10% of its original strength. But reflections are coming from every direction and they can really add up or subtract up depending on the sum total of all vibrations.
He put a link in the description if you want to learn more.
Anything you can do to get your walls and ceiling to absorb, trap or diffuse. Furniture carpeting and heavy curtains can absorb middle and higher frequencies and reduce the echo. But bass will still bounce off of them. The diffuser can help with Bass in conjunction with bass traps which is a different article. Search around his channel and you'll find lots of information.
The diffuser breaks up the timing of the reflection but because it is a baffle it is also somewhat of a trap. Some of the sound will enter a baffle strike the rear wall and come straight back out again. But some of the sound will hit a side wall bounce to the back, bounce to the opposite wall and then come out again. Just like pool balls striking rails. It loses energy every time it reflects. some of the sound in the room will enter the baffles at an extreme angle and may bounce many times before coming back out into the room. So it is somewhat of a trap. All bass traps are somewhat of a trap. Bass frequencies have more energy than the mids and highs. one of them can completely absorb all Bass frequency. If you treat a room for mids and highs but do nothing for the bass that is also a distortion of the true sound. Is it really important? For a recording studio it is. It can greatly improve home theater sound or listening to music. It relates to volume because at low volumes you won't have high energy reflections.
Hey, cool trick! Using gaff tape to pull pricetag adhesive off the panels was worth the price of admission all by itself. :D
Nice shop! Especially that wooden bench vice.
Quadratic Diffuser comes right before quadratic equation in the dictionary.
How big is the TV opening? Is it sized for a 55" ? The photo makes it look a bit small so I'm thinking I'm misjuding it
50" wide - the wall is 14' long.
Most 55" TV's are less than 49" wide these days. But then this isn't a home theater. I'll watch stuff down there but it's primarily for listening to music.
Pretty cool
I don't understand how it works yet, but it sure looks awesome
I'm ready to move my drums down there. 😝 This is awesome John!!
1. What did you use to determine the RT60 time and prime? 2. Why would you have an alcove in the middle? I don't see use of horizontal just 2-dimentional, why is that? I do like your build philosophy...
I'm not into acoustic engineering but I find these panels make an interesting design.
Agreed. But I would still have liked to learn something about the principle behind the design.
Hey! I’d LOVE to make a few of these for my Recording studio. How do I get the plans for this? I appreciate you and I look forward to your reply.
I was skeptical, but your version of my shelves + random depth books looks better. I bet your plywood bill would pay for two or three in-home performances by a good jazz ensemble, but you beat the Great Plywood Depression by a few months.
I hated the way my old house sounded. The nag of my exwife was unbearable.
Title: What's a Quadratic Diffuser?
Answer: No idea, it wasn't explained at all.
Would love to see the acoustic measurements when you are finished .👍
It is nice that Stephen Root is making woodworking videos now.
The title says "What's a Quadratic Diffuser?" and yet you never address this in the video. Disappointing.
Seems Like Click bait. He never tells you what a diffuser does. Save time and look it up
WHY AREN'T YOU USING YOUR FISH!!! You're teaching everyone who watches, to cut their fingers off!!!
No he's not. Stop being safely police 🖕
Can you please add the Diffuser width and Theoretical depth of this diffuser ?
Is the applicator pad your preference for applying water based poly? I tend to get bubbles with brushes or fine napped rollers.
All these comments and not ONE regarding his choice of clothing?
mental masturbation and of course water based poly urethane
Man I want to do all of this... someday...
Hi Guys, I cant find it, what is the well width in that project?
Could you hqve used a pin nailer instead of the brad nailer?
This is definitely a cool looking build, John.
Looks like a very complicated DIY for rookies like me
GOOD JOB..👍👍,, #KAWANUA MEUBEL..👍👍🙏🙏😊
Why polyurethane, instead of varnish?
That's amazing, I just finished a BEM simulation of QDRs for a project at engineering school 😅 insane timing
George Lucas doing woodworking is exactly what i needed rn
Hey. Is there a specific reason you are not using a riving knife on your table saw? I've read that those are one of the most basic and easy table saw safety features. I'm just wondering what situations besides using a dado or ultra thin-kerf blade would have you not use one. Thanks.
I noticed you did not answer the question that got me to watch your video. Watching you build it was fun, but I still don't know what a quadratic diffuser is. I guess I'll go google it.
What is the width of the wells ?
Can this be painted with acrylic car paint ?
Did this treatment to my audio room and it made a WORLD of difference. Did a Bi-Directional though, out of reclaimed wood.
I suppose RPG's patent has expired
Ah, the old Quad Diffuser, been a long time since last exposure to this misunderstood method of handling Sound Phase Shifts. Like we say in the biz " don't let your sound die, it just heats up the room " haha (inside joke). I digress, so you're listening to your favorite music and you wonder " can I get it to sound even better " .... why hell yes ! You can spend a ton of money and time by building your own Quadratic Sound Diffuser, at home where you feel safe and secure in your thoughts and hairbrained schemes to take things a little too far. So, after you review the plans and consult with your psychotherapist you will probably go to Amazon and buy top of the line Ear Buds for your listening pleasure. Ear buds, a comfortable chair, some kind of alcoholic beverage combined with closing your eyes will make Comfortably Numb, comfortably numb. So it goes and hi - ho.
Hi John, I've recently discovered your channel and I'm enjoying all your builds. Have you considered putting a filling such as rockwool in the wells of a QRD diffuser? What would be the outcome if you did? Would you get absorption and diffusion? Thanks
Your name is amazingly close to mine, both first and last name if John Heisz is your name and not just a channel name.
👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻🥰🙋🏻♀️🇧🇷 Your videos are wonderful, please, if possible, put subtitles in Portuguese. Thank you!
Would it make any difference in their effectiveness if the panels were installed horizontally?
They would scatter the reflections vertically if mounted horizontally.
With all this discussion about acoustics... made me think... have you ever made any wooden musical instruments? I know you're a Rush fan (I've seen the 2112 shirt)... how about trying your hand at making some Temple Blocks like the ones Peart used to use on Xanadu and The Trees...? just a thought...
Nice work documentary. I confess I was disappointed that with a title as you have, you did not explain what the QD is, or does. I mean, really.
When making a hollow structure like that, it's important to make sure it's perfectly airtight, or you'll cause sound issues.
guessing that it bends sound waves, ... bwtfdik either that or creates total harmonic distortion which is also the same as manipulating negative space...
Hey John, new to your channelI! Dig all your A/V booms and gaffers made out of wood instead of the typical metal or fibre glass "store-boughts"! They blend right into the shots. BAD ASS!
What did you use to eq the room and formula to know exactly the dimensions of diffusers, please? I've limited knowledge in this audio sculpting and applying it to my studio. Thanks!
I remember watching a movie about a quadratic diffuser. It was exciting, but at the end the guy got killed because he cut the wrong wire and the quadratic blew up.
been meaning to for a couple of years now but your videos dont come up in my feed too often....SUBSRIBED AND HIT THE BELL!!
you are a very talented craftsman. I would like to do some woodworking but I live in a small flat in London and don't have the space. Maybe one day, but until then I will try to learn about the techniques you use. Big ups!
Awesome! One problem I have with this. Basement. Not in my world. You would need to make it from mold treated cement.
But.... what IS a Quadratic Diffuser? besides very entertaining build?
you are a real carpenter. Great job done.
That looks freaking awesome thanks for the great work.
This is the coolest project ever.
Sharp-looking build. How did it sound in the end?
So why not just finish both panels on both sides, helps preserve the wood, & avoids any possible mix ups ?
John I would like to ask an unrelated question : How do you heat your workshop ? I live in Ontario and would be very interested in your answer. I enjoy your videos and have built many of your projects using your plans, keep up the good work.
You mentioned better sound for a TV or movie room at the beginning. Would it help the sound in my living room for movies and sports on the big TV and sound system? The sound in my living room is terrible.
What are the messurements?
Very nice. Cracked barn wood or a random criss-crossing of slats works extremely well too and can be made to look like amazing wood art. Lots of ways to diffuse!
Nice. I have a quadratic diffusor design that I did for a studio that George Augspurger designed. It is very simple with very minimal ripping you just have to buy 1x2, 1x3, 1x4, 1x6. and only a few pieces are ripped. Saved a lot of time. Anyways, your craftsmanship is great and you definitely have a lot of patience which is rare these days.
Hey! I’d love to get a hold of that design plan so I can build some!
Quadratic is a bit too low degree, I'd rather go with cubic diffuser.
nope.... led zeppelin quadrophenia... that is the cause of all this mania.
Pretty interesting work, John!!! 😃
And it looks pretty nice!
Stay safe there with your family! 🖖😊
Dude you have almost 100K followers and 250,000 views in a week. You inspire people to try what you doing. That means you have a responsibility to show them proper safe use of tools. Don't push boards through a tables saw with your fingers. It takes two seconds to use a stick to push it through. It's really inappropriate to not be a good safe mentor/teacher. I do love your builds though.
🖕
I love the mechanical equipment in your office, it's modern and powerful
I've started to get into my audio kit recently, but as my house is an absolute tip of a construction site, I've cheated and just gone with headphones. Sennheiser hd800s, Chord Hugo 2, Focus Clear, Chord Mojo, and a Qobuz subscription.
When is the party?
might as well just paint both side of both sheets. Less things to worry about
This looks like a similar process as to the finishing work of Stradivari with his construction of a violin. At a microscopic level their is a honeycomb chamber effect on the violin making the sound of the instrument very distinct and enticing.
Hey John,
Did you use a calculator for your wells? If so, I'm glad you went so deep with them, a lot of people make them shallow.
For more rudimentary diffusion, try bookcases and random books.
Dear John. Big thank you! You inspire me. I've signed up for your both channels. All you the best!!!
Beautiful work my friend 👌
He sounds like the guy that does speak from penn and teller.
I want to build these for my studio
Sweet setup. Love the ply look. How does it sound?
Did you not have an issue with raised grain with water carried varnish?
Gave you a like to get you off the devil's number. I like what you're doing here John. Having been in the home theater and automation industry, I'm intrigued to see the outcome and the system going in.
Hi John, I am going to make one exactly as yours, may I have the well width? BTW, do well width and height make difference?
I meant the diffuser height.
Thank you.
Very impressive! You have great tools and the skill to use them. The sky is the limit to your creations! Any chance you could video the build of a half column diffuser with a flat back to secure to the wall: perhaps 8 feet tall, 2 feet wide, and a radius of 1 foot.
Is this better than the cone of silence ?
Still don't know what they are after watching the video