Small Room Acoustics: Traps and Frequency Response - Part One
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- Опубликовано: 16 ноя 2024
- Small Room Acoustics series includes info on:
• Traps and Frequency Response
• Small Room Treatment Basics
www.jhbrandt.net
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Music: "What Makes People" by Jimmy D.Lane
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So glad you make these videos John!! Hope you keep making them I'd love to see your "dream build" sometime. Just pull out all the stops and design your ideal studio from the ground up!! I want to build a very small 12'x8' on a relatively low budget and I'd love to see what features are most important to you in acoustic design if you were building from the ground-up!!
Much love
Wishing you GREAT SUCESS with your studio. Would love 💓 to see the finished project because will be creating the same.
@@robbinbigham9305 Wonderful, I'd be happy to share once it's done :)
This is just such an unbelievable resource. I can't thank you enough for all this information you are providing..
I have been researching and planning for almost a year now. I have a large garage I am going to convert. I want to use it for a tracking and mixing room. Going to try and go with a combination room.
I have removed all the Sheetrock from ceiling and walls. And in the process of reinforcing the outer sheathing by attaching the Sheetrock to the sheathing from inside the bays leaving enough room for backer rod. I sealed the sheathing with silicon then applied the Sheetrock and sealied that with silicon. Then I am going to put the pink fluffy back in existing cavity.
Frame new walls leaving 4 inches between 2x4 edges. Then pink fluffy in new leaf, which will be properly decoupled and have firestops in the proper locations. Then 2 layers of 5/8 rock with green glue between. Th ceiling is going to be on hat channel attached to RSIC #1 clips , 2 layers of rock with GG in between.
I intend to trap at all 12 corners, and by building the corner traps detailed in Rod book as well as Everest.
I am wondering how to put my values into your room mode calc if I have an L shaped room?
I have not framed walls yet so I certainly have the ability to alter plans. I have purchased all my 2x4 material, most of my gypsum, the green glue, clips, hat channel, a pallet of pink fluffy, a bunch of 703 and some 705 FRK (do you agree with Everest on using that with foil facing out in corners?), a MINI SPLIT unit. Pretty much 90% of material.
I have a lot of various hardwoods on hand at my shop, and want to build my own desk etc, QRD, etc.
I was considering building the acoustic frame so that I could be modular in a way. Essentially place and remove panels as necessary or reverse boxes that are absorptive on one side diffusive on the other.
I have got to the point that I have talked myself in and out of just about every option and design, and I'm back to where I started .
Anyway thank you for you videos.
Very Informative indeed John
Your videos are fantastic! Thank you so much for sharing your knowledge
Love you batik shirt sir 👍🏼👍🏼
Thanks a lot for your videos. Very easy to understand. One question. For isolation, what do you think about fiber glass? Where I live I can get 10 cm fiber glass (cheaper to fill a 30 cm space between 2 walls). Thanks again
Hello John i live in a country where MLV is impossible to purchase and rubber as well what can i do?
Great looking bass trap! I wonder, does this simply get pushed into a corner or should it be angled across the corner? Thanks
Terry Doyle these membrane traps are usually placed at wall centers. I don't usually use these in corners. Also, this type of trap is rarely needed in a framed room with gypsum panels.
does the back wall of the membrane absorber need to be parallel to the membrane? I want to mount it into the corners and safe money and work with building a parallel wall
It does if you want to know the resonant frequency of the membrane. It is very difficult to predict the resonance when the trapped air has more than two 'modes'. Depth being the critical factor.
Limp membrane traps work at one frequency. They work best when placed in the center of the wall where that axial mode is at its peak performance 😉
@@JHBrandt Thank you!
Does the weight of the membrane only tune the resonator down, or does it also increase the performance of the unit. I can imagine that it could handle lower frequencies better, because it doesnt move that easily
Yea
God has spoken!
Does every membrane need its own cabinet with side walls or can i use a whole wall as one cabinet and mount several membranes next to each other? It would safe money and time but will it loose performance?
I wouldn't do it. I have no supporting data to say that it would even work. Membrane units, even limp bag types, are tuned. The larger they are more unwieldy they become. I also would not go 'crazy' with them. Us them for the amount of trapping needed AT THAT FREQUENCY. The rest should be broadband and diffusion. That's my opinion based on very little information about your situation. LOL.
@@JHBrandt put a perforated panel in it and it works broadband ;)
I think a 16 inch depth with 1lbs/ft2 would trap down to around 35.75 with the isothermal air mass in your model?
Really appreciate your expert knowledge. Awesome videos and explanation. I'm planning on building an isolation booth for voice-over recording & making it portable being that I am renting right now. As soon as I turn on the mic, I pic up EVERYTHING even my downstairs neighbors ceiling fan. Planing on using double layered OSB or MDF panels with Green Glue sandwiched in-between with screws and cotton insulation on top of the walls. I've heard a lot about not having two walls that are the same size. Would you recommend a pentagon shape of sorts? Sort of like a diamond or superman logo?
You CAN make it asymmetrical, but sometimes that is not the best use for the space. Remember, when soundproofing, mass is your friend. You should use the cheapest, heaviest material for the wall panels. For this reason we use gypsum board (drywall). Cotton insulation is very, very expensive compared to the good-old pink stuff. And it does not perform better! Use standard building insulation and save the money for your treatment.
Hello sir John,
I'm going to do a DIY audiophile room.
1.) Would it be alright if the right side of the wall is made of concrete (the existing one) and the left side is made of drywall with rockwool insulation (new wall)?
*will having different wall materials affect the sound quality of the room?
2.) What thickness is recommended for the drywall and rockwool?
Thank you!
Your questions tell me that you need to educate yourself a bit more on acoustic treatment before attempting this build. What are you trying to do, build a room that is soundproof, or build a room that is acoustically pleasant, or both? Concrete reflects almost everything back into the room. Drywall walls, even with 2 layers of drywall on both sided of the stud and rockwool in between will leak most of the sub-bass through. Furthermore, this room will not be acoustically pleasant without some acoustic panels that decrease sound reflections.
I had a crazy idea to use stacked 5 gallon paint pails with lids on them as mini helmholtz resonators targeted to certain frequencies.. All along the walls. THink that could work?
😁 No. Because the buckets are not massive enough.
I am not a fan of Helmholtz resonators in studios, except for very specific applications
Lovely batik sir,
Sir, I'm about building my very first vocal booth, because I lived in a noisy area, do you have any suggestions for me? Thank you sir
See my resources page. There are DIY booth plans.
wow, you wear Batik I noticed! suite for you, John...
Hey! just found your channel. Im building a small production home studio in my 10' x 10 'room (im not allowed to open the walls because im renting) and my ceiling is cement, my 4 walls are gypsium and my floors are wood. What would you recommend as acoustic treatment to cover the cement ceiling?
Thanks!
10 by 10 is not recommended, honestly. Are these dimensions exactly 10 feet?
Send me an email please. John@jhbrandt.net
Excellent video. My only question (because I wan't to try and build some of these) is: What is the material that is being held by the metal frame (the diaphragm). What is that material? Thanks
Some use an MLV, but I have found it to be far too thick at the correct mass. Therefore I specify a sheet steel and rubber sandwich. This sandwich is different for each application and determined by the mass required to obtain the desire frequency of resonance.
My question to YOU is: why do you think you need membrane traps? :)
Mr. Brandt, thank you for your quick response! My room is 10.5ft x 12ft. Because of how the room is situated, I am set up with monitors dead center of the room, and I am facing the 12ft wall. I have a fiberglass panel facing me, and another identical panel behind me. The walls are mostly drywall, floor is ceramic tile. The bass in here is not good, and is all over the place. I don't believe in foam at all for bass. Judging from the research that I've done, the only way to tame bass is with membrane traps. I am currently selling my monitors, which are 8", and too big for this room I think. I'm going to change those to 5", and see how that works. However, this is a new home, so I'm trying to dial this thing in, because right now - it has too much reflection, and is impossible to mix in.
If your ceiling are 8', you don't have enough volume. You only have 2/3 of the recommended volume of 1500 cubic feet for even modal distribution.
Now THAT said: you CAN treat the room and get some decent work done, but you'll need a LOT of broadband treatment. Membrane traps are NOT going to help you in this instance. You do not have concrete walls. You have a framed structure and if it is residential, your wall resonance/transfer frequency is around 70 Hz. At resonance, sound passes right through, as well as all of the frequencies that fall below resonance.
I've said this before, you don't TARGET nulls with membrane trapping, you target Axial Modes! And your axial modes most definitely will fall below the wall resonance... it gets complicated here and I don't have the keystrokes to explain. Perhaps in the next video.
Please read my Balanced Non-Environment Criteria paper found on my resources page. All the best!
Thank you!
I've read your paper on Balanced Non-Environment Criteria, and it's way over my head. I really don't completely understand what "broadband" treatment is. For my room, I think that it would sound a lot better if I would to lessen the reflections, and continue to mix my demos at a low volume so that the room doesn't come into play as much. I have to keep reading your resources. I'm certainly no engineer!
Hey John I'm in room which has ceiling height approx 2.5 meter. And I have room which is above this room and has the same dimensions as the room below where I have my monitors right now, but it is under the roof and has weird angled roof that has 8 corners. In the center of the room is the biggest distance from the floor to ceiling (tip of the roof) in this room which is approx 3.7 meters. Should I move my studio to this room istead of the room below?
Thank you!
Daniel, I don't know. I need to know a LOT more about the spaces. Perhaps you could send me an email with drawings??
@@JHBrandt I could send you photos of the room, which email shall I use?
Thank you!
@@danielkisel5661, use john@jhbrandt.net.
Talk to you soon.
I LOVE YOU MAN
Well I'll be. Hello John,. This is Rick Fitzpatrick. Just found this by accident. Hope you are well. I quit my interest in studio design right as I worked for you. Not enough time and age became an issue too. Anyway, just thought I'd say hi.
Rick, send me an email. John@jhbrandt.net 😁
super
nice batik..;)
Man I swear it is Heinsenberg voice!!!!
LMAO! Glad you liked it. Are you a fan of "Breaking Bad". That was a good series. :D
@@JHBrandt nice talk, I started Watching because Guido from cats and Beats. Great information,keep Watching your channel. Btw, it was so good that I still hate Skyler hahaha