How To Build A Quadratic Residue Diffuser (QRD)

[@soundproofyourstudio]

FREE Soundproofing Workshop: www.soundproofyourstudio.com/acoustic

[@koki8399]

Honestly, I watched around 80 Videos on KZbin to this topic now, but none of them summarizes the topic as good as this one. Well done!!!

[@soundproofyourstudio]

Thanks! This was a big vid to do. Glad it landed well

[@jonathanday7787]

simplest explanation of QRD i have found to date. thankyou!

[@soundproofyourstudio]

Glad it was helpful!

[@kibatail]

I love how informative your videos are, plus how well you communicate complex information. I have a big question that I'm sure alot people have. I live on the second floor of a two story apartment where footsteps vibrate down to my lower neighbors if I'm not careful. I love to sing, (but im not great) and would like to create a structure that would allow me to practice singing without my voice bothering my neighbors. I would say the walls and floor are fairly thin as sound passes through muffled pretty easily. My current plan is to buy 1 inch 12x12 thick corkwood panels and make a rectangle box about two feet long and one foot tall. Next I'd apply adhesive polyurethane foam to the inside and simply sing within it. Do you think it would work in reducing the sound entering the room below? What do you think the best option is in this situation. What's the best value option based on your expertise? I live at the end of the building so I only need to worry about the room below mine.

[@soundproofyourstudio]

This is a tricky one. I have been imagining a vocal booth design for this type of situation. I think I might design one and sell the plans since it is so common. The key is to add mass on all sides, especially the floor and then decouple that mass. It’s complex enough that it would require more explaining. If you want me to design the be just shoot me an email - [e-mail]

[@stevenbarnard]

Hey Dude. This is a great video thank you. I have the carpentry skills I need but not the math skills, I'm going to need to watch it again and let that sink in. Problem is I can't seem to open the link to that calculator. Any chance you could post it in the comments? I think I saw the same link on another site and it also wouldn't open there...just gets stuck whilst loading. Really struggling to find another calculator. Appreciate any guidance with that. Thanks

[@Carl-iw9sy]

Other videos show how to build them without giving you bandwidth details. This video is perfect for my needs. Thank you sir.

[@soundproofyourstudio]

Awesome!

[@dragonstone6594]

Amazing video explaination man, best one I've seen! Question: What if I build a QRD without the fins, like lets say make the wells from solid wood and place them next to each other? Will that make the performance better or worse compared to the normal QRD with fins?

[@soundproofyourstudio]

You need the dividers for it to work. Not sure I understand what you are trying to do.

[@plexibreath]

I understand a certain distance needs to be kept of the microphone to the QRD diffuser, but I don't know how to calculate that. Is there a ratio, of the deepest well of the panel, to how far away from the panel microphones need to be? So If I have 6" deep QRD panels, what's the closest I can set up a drum kit with it's microphones, to the wall with the QRD diffusers?

[@soundproofyourstudio]

Great question. This is from acoustic fields : For the interference patterns to fully develop into a diffuse field, it is recommended that the minimum seating distance be three times the longest wavelength diffused. Diffused wavelengths need time to form completely before they reach the listening position. If one is seated too close or has the diffusor too close to the speaker or sound source, the diffused wave does not have time to properly form and you can have image shifting.”

[@insidepianos]

I had the same question. Also from Acoustic Fields: the listener or microphone should be at least the wavelength of the lowest frequency. If that is 250 hz that would be about 4.5 feet.

[@ERMAV]

What’s up modulo how you doin? Thanks for explaining this equation:)

[@MajorGRecording]

Are you familiar with Tim Perry's Fractal Sound Diffuser design? (Arqen Audio) The DIY plans are free on his website.

[@soundproofyourstudio]

I am not but thanks for sharing. I will have to check it out.

[@groovybeanaudio]

Roughly how many do you need for a typical single room home studio?

[@enzodonovan5691]

Whats the algebric relations between well width and high frenquency cutoff

[@soundproofyourstudio]

So the deeper the wells the lower the diffusion goes. The thinner the fins the higher the diffusion goes. Ideally you would have super deep wells with razor thin fins, but that is structurally difficult.

[@wallstreetcrash1]

I like this. I’m on it… Thank you .🙂🇬🇧👍

[@soundproofyourstudio]

You are welcome

[@angelohypolito4955]

Nice i'm about to built some of them.

[@soundproofyourstudio]

Awesome

[@therockhour1386]

PREACH!!!

[@stevekamala]

thanks alot for making this video.

[@ProdbyCeeSick]

Where have you been all my life.😂TY🙏

[@soundproofyourstudio]

Haha

[@audfrknaveen2256]

Awesome explanation ❤❤❤

[@soundproofyourstudio]

Glad you liked it

[@anhellehna6858]

Where is the "how to build" video?

[@soundproofyourstudio]

Coming eventually. Stay tuned

[@DoYouDJ]

Maybe rap it

[@soundproofyourstudio]

Thanks for watching

[@stevenbarnard]

😂

[@BettyHernandez-j2o]

Lewis Amy Allen Mary Thomas Joseph

[@aprop544]

I'm not happy with the measurements and your explanation...the measurements in the drawing can't be found unless the thickness of the fins is 5mm and not 6mm as you say in the video

[@soundproofyourstudio]

I will have to double back on that. Sorry if I misspoke

[@longfade]

Your vocal recording on this video sounds suspiciously bad. It kind undermines your message, and if my recording setup produced results like this I’d be very unhappy.

[@soundproofyourstudio]

Yeah you know if you turn it up you hear a little hiss. At the time I didn’t have a cloud lifter on my SM7B. Now I do so that don’t have to gain it up only using my Apollo pres. Fair point, but I have addressed the issue.