How I Built My Quadratic Diffusers

[@davidsarge7851]

It seems that you are not installing the well depth sections in the proper order. According to the "Calculator", the first well "0" should be at 0 inches depth; the "1" well at 13/8 inches, et cetera. Could you explain why you didn't follow the prescribed order? Thanks for an awesome build plan, otherwise.

[@marklydon435]

Prime 7 are the shallowest at around 4". As you go up in prime numbers they get thicker and thicker. The higher primes can defuse lower frequencies. Small rooms can benefit from defussion as it makes the room appear larger to your ears. Only issue you have is that there is a minimum distance you need to be away from each defuser and that increases as with the prime used.

[@Notinserviceij]

No, but yes There is an optimum distance away you have to be to benefit the full effect of the diffuser but even a very close distance from a qrd diffuser is better than a bare wall where you don't have absorption It's not a set in stone thing people in small rooms benefit but not as much as some in an optimum room but who has an optimum room? Not many people

[@cap706]

I'm disappointed that this creative way to build a diffuser without router wasn't out before I built mine. I could've had this cut at lowes and nailed myself. Awesome job!

[@JesemanuelRamirez]

A router?

[@JesemanuelRamirez]

In any case yours is the more functional one. I don't really like how he contracted it. I think the frame is too thick, making it heavier than necessary, but because the construction method is too flimsy, it needs it. He didn't glue the wells together, so if it's for a listening room, the loose boards could vibrate and produce unnecessary rattling sound. Low frequencies are like bulldozers and will vibrate this diffuser if you have a subwoofer

[@TylrVncnt]

Studio looks AMAZING (!!) great work! Thanks so much for sharing what you know and also what you *dont* (!!) super key! You the man Peace

[@TrueSoundTV]

My pleasure!

[@rhodoliteproductions8344]

Any particular reason why you didn’t use glue in between those Wells?

[@FanaticDrummer]

Just speed. Thats about it. Although i’d both glue and nail to help keep the support solid for years.

[@scoremoore4280]

Just casually built a house, by yourself. Good stuff. Amazing video. Looking forward to more.

[@audiononsense1611]

Just some advice- determining what prime # to use is critical and is based on frequency range and distance (this determines the 1/4 and 1/2 wave octaves...

[@sangsseerup960]

How do you record vocals in that booth? By facing towards quadratic diffuser or backward? And how much distance you made from that diffuser

[@pennesalmone6350]

I am coming from the audiophile side and I understand that a studio will always be more damped than a listening room but the sound in the finished studio is kinda dead for me. Nevertheless really useful stuff, helps to treat a room without paying a fortune. I'm afraid the key is though where, how many and what type of acoustic panels to place in a room...

[@briansallee4262]

Love the build. 2 questions though. Is it usually recommended to have 2 mirrored diffusers side by side? I see that a lot. Also, wouldn’t those curved panels focus the reflections? I would think they would need to be convex in order to scatter reflections.

[@montrosvids]

Thank u for sharing , showing the world all your knowledge 🏆🏆🏆🏆🏆

[@uptownphotography]

Another super nice and well detailed video. Great job. Is there a video on how you made those panels that are on the walls to the left and to the right of your control room monitors? (with the horizontal slats). Also, being as I caught this studio build from part 12 (I will watch earlier ones too), can you tell me the length, width and ceiling height of your control room. Excellent job. Thanks and all the best. Philip

[@tomhoscheidt5056]

Thanks for the video. I built 2 QRD13s using this method for around $80. I have built about 9 QRDs over the years ranging from 7's to 23s and I believe this is a very good, very accurate way to build them. I did use QRdude to do my design but I doubt makes much difference. My only other comment is to dry fit your fins/faces to make sure you are dead on with your last well. Its a bummer to end up with extra space and have to trim it down post build. I see you filled it with extra material to fit your space but I wanted mine to be the same width of my other diffusers.

[@DMKahn]

I’m building this. Thanks. I seem to notice you did not follow the well depths in the calculator.. Is there a reason for that? Not sure if anyone else pointed this out already. Anyways thank you for showing us how to build this, it’s gonna be great in my studio.

[@milkman100001]

your calc didnt take into account of the fins

[@BabBobia]

Is that a staple gun you re using ?

[@_ren5506]

this looks like the roofing on my house

[@nathanieljohnsonjr775]

Great to see you posting again!! Great video as well!!

[@TrueSoundTV]

Nathaniel Johnson Jr hey thank you! Yeah I am finally back on a schedule and have enough videos ready to go that I can start a normal posting schedule again!

[@rossbarmache4252]

gawd that intro is cringe cheesy

[@thirdtribestudio]

Great video ! What kind of lights do you have in the background at the beginning?

[@TrueSoundTV]

They are just standard led strip lights!

[@marklydon435]

Should have used a wood glue.

[@bilba99]

Nice build method, I like how simple and quick it is. I would have added glue so there is no air leaking out of the bottom of the wells. I'll add a link to your vid when I get a chance. Regards, Bill, QRDude author.

[@gordthor5351]

You also get more nail blowouts when you don't hold your brad nailer perpendicular to the narrowest dimension of the piece susceptible to blowing out. Brad nails have a chisel tip, thus the nails will tend to veer sideways relative to your gun, not up or down. So, when you hold your gun parallel to the longest dimension of your wood 1.5", the direction of veering will be in the 3/4" dimension, rather in the 1.5" dimension. Which allows for more room to avoid nails blowing out. You don't even have to hit a knot for a brad nail to blow out with only 3/8" wood on each side. The chisel point will sometime follow the grain of the wood and blow out even if you are holding the gun dead straight. The way you were positioning your nail gun in the video was just begging for blowouts. Turn it 90 degrees next time to greatly broaden your odds of no nails blowing out.

[@stvticsteve7249]

This video is amazing thank you so much! Very easy to follow and well shot. One engineer to another I appreciate you! 🙏

[@mostirreverent]

You could probably have someone cut some closed cell polyethylene foam for you and just press it in the right depth and/or add several pieces for the deep wells. This way all the facing pieces would be The skin side of the foam. Or you could just have 1 inch thick foam cut for each depth, and then spray the open cell face of the foam with rubber bedliner or something

[@CobraChamp]

Awesome videos! Thank you!!!!! I’m off to Home Depot to build some for my dedicated listening room.

[@thedayones4918]

I didn’t know Saul from you “Better call Saul” or “Breaking Bad” was also into recording studio design. 😁✌🏽

[@bravedave90]

Would a quadriiac diffuser be necessary or, even effective in an open living room over a window in space smaller than 1500sq?

[@janoskrieser1050]

Thank you for this video, it's really helpful for me! What type of nails did you use to join the pieces?

[@dougleydorite]

I have some absorbers on my side walls that have scatter plates on them. Fairly small room but they are behind my first reflections so hopefully I’m okay

[@Campbell1.]

I cant see from here...what Prime are they?

[@TrueSoundTV]

All the info is in the description!

[@ColocasiaCorm]

Hack

[@РадикСадыков-м4р]

great!golden hands.

[@gdel5104]

Awesome! Thanks for sharing this!

[@TrueSoundTV]

Thanks for watching!

[@gurindersingh7933]

Great video

[@gurindersingh7933]

Can we get frequency response comparison with or without these stuff. Thanks again to make us informative.

[@TrueSoundTV]

gurinder singh there’s no way for me to do a comparison because I’d have to take these out of the wall in order to do that. Thanks for watching though!

[@gurindersingh7933]

@@TrueSoundTV it completely fine I will do some search over that

[@krkbeats007]

Awesome videos! Great work thanks for helpful tips

[@sergeykouptsov]

Amazing!

[@vinahousefromuk4785]

how about stick with glue ?????

[@EdistoDavid]

What was the cost?

[@TrueSoundTV]

I'm not 100% sure but around $120. It was about $50 in pine, About $50 for the thin luan wood, then about $20 in paint and screws/nails

[@audiokemestry]

Really slick design. Great work!

[@RoboticusMusic]

I wonder how quadratic compare to rooms like Studio C at Blackbird Studio.

[@Oneness100]

If you want to learn more about quadratic diffusion, I'd head over to Acoustic Field's KZbin site. They have a bunch of different videos on Diffusion.. There's probably about 10 or more videos on their YT site that discuss diffusion. Really informative and more practical explanations. Plus, they cover absorption and they also talk about the myths in the industry.

[@C--A]

RoboticusMusic check out Audioholics recent Room treatment video series on their KZbin channel. They have a video specifically on diffusion. You know with Audioholics you don't get any snakeoil. Or marketing nonsense from companies like AcousticFields with their activated carbon wrongly claiming its much better than it actually is.

[@RoboticusMusic]

@@C--A Has anyone tested Acoustic Field's carbon vs different kinds of ultratouch, mineral wool, fiberglass? Producers are polarized on his advice. I know it's massively more expensive to use carbon and such heavy duty wood for QRD's and other construction, but is it 1% better or 15% better, someone really should test his products against cheaper alternatives with a measurement binaural head and other testing methods.

[@jackc8120]

@@RoboticusMusic my friend spent so much money on his carbon technology and it was zero difference when compared with home made OC703 panels and MDF diffusers. Activated Carbon and his "special foam" is all hype. Save your money and make your own.

[@RoboticusMusic]

@@jackc8120 Wow, MDF works? How thick? Does it have a wood veneer? Does he have any A/B recordings? This could be pretty useful for the community but it's up to him and his personal time. Thank you for the information.

[@patrickwilliams1886]

Man thank you for your insight. Love your channel

[@simonanthonymusic6992]

Hi. Great vid but can I ask. Where did you get the original 5” etc from to put into the calculator? Is that based on your room or is it just the wood size?

[@castro619a]

In the video he said 5.5 because he has 1x6 boards already.

[@gamingmusicandjokesandabit1240]

Quadratic diffusers: (hears discriminant - b^2-4ac - has no solution) Am I a joke to you? (no offence).

[@hammerfall321]

There are always two solutions in the comples numbers.

[@rossbarmache4252]

the studio guy made you pay him?

[@johanarens9798]

Amazing work ! I'm looking at building quadratic panels, your method is by far the easiest and the one that is giving the best looking panel. Other point, your control room sounds great, at least with your voice !

[@billibe7035]

Nice job

[@garyshirinian]

Thanks for sharing. It really was helpful, in the future I might make them . However what did you use for bass traps. I have room size 11 feet by 13 feet by 8 feet ceiling. What ever you think . I'm just a hobbyist. Thx again.

[@garyshirinian]

@Sendit Sunday thx .

[@garyshirinian]

@Sendit Sunday I know .however, that the only room I have In my house . Haa haa

[@TrueSoundTV]

In my studio i have 4 giant 9 foot tall 2 foot thick bass traps in each corner but i'm mixing and mastering everyday. You might want to start with 1 large trap in the back of the room, as a cloud panel, or 2 next to your monitors.

[@erikabbor4520]

did you put the wells in the proper order according to the calculations? I have a hard time following where you started from :)

[@TrueSoundTV]

Oh yeah of course, without it it would kind of be pointless! It is definitely a little confusing especially watching someone else build it, but if you end up doing it yourself, it’s easy to build it in order and keep it all correct

[@erikabbor4520]

@@TrueSoundTV Ok, I'm probably wrong, but it seems to me that nr 2 and 5 are all the way up, when they should be all the way down 🤔 Just to make sure before I start on my own 😅

[@MattKane]

@@erikabbor4520 yes I was wondering the same thing. I was just starting on my own and noticed this as well.

[@mcsweet1966]

Thanks for the Great Video, Is there a reason you did not use any glue at all

[@TrueSoundTV]

Thanks for watching! So i felt it was strong enough with just the brads, not to mention if i had to modify them for whatever reason i could

[@mcsweet1966]

@@TrueSoundTV They look amazing, Great Job

[@natlove219]

💪💪🙏

[@weetzybat]

the online diffuser calculator ink doesn't work now:(( Any alternative you recommend??

[@alwaysexplicit]

Whats considered a small room?

[@TrueSoundTV]

Rooms under 1,500 sq ft!!!