Where To Place Absorption/Diffusion - www.AcousticFields.com
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- Опубликовано: 5 фев 2025
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In this video chief acoustics engineer Dennis Foley talks about where to place absorption and diffusion elements within our rooms. Watch this video to learn more.
I found a lot of people said different things this video made sense of it, thanks!
Glad it helped!
Great information to get a general overview of right sound sculpting measures usage to achieve desired and predictable results. Absorbtion of good quality is a necessity to achieve LF desired level and it just can not be enough of diffusion if it has the right placement and dictance to the listening/recording source for the room of any purpose in most situations. Diffusion is a final key and a great way of polishing the frequency responce of your room naturally.
Hi L, There is a systematic approach that must be followed in any small room strategy. You must first address the low frequency energy below 100 Hz. Failure to address this issue first, will result in systematic failure throughout any middle and high frequency absorption or diffusion treatments.
So, based on this information I'm planning to get two 23" x 23" diffusers (one in front of me, one behind), and sound absorption panels (one on each wall beside me, and one or two on the ceiling. My vocal booth/room (which will be used for audiobook recording) is roughly 6.5 x 6.5 x 6.5, with an angled doorway on two sides. I was also planning to get some foam bass traps for the ceiling corners. I'm just not sure if what I've calculated (as far as how many diffusers and sound absorption panels) is enough ...
why would the rear wall problem mentioned for mixing not be relevant for mastering?
All walls are relevant. If budget is an issue, you must treat the front and sidewalls. Rear wall diffusion is specified for mix and mastering rooms.
Hello M. Foley. Thanks again for sharing your knowledge with us. I would be really interested to know more about speaker types (espacially stands vs inwall speakers) according to their usage. I mean, what are the benefits and the caveats of each type in a home theater room from an acoustical point of view? Forgive my English, I'm French🙏🏻😅. Thanks again!
L, In wall speakers suffer from diffraction issues. Freestanding speakers are a better choice where sound quality is a concern.
Very interesting! I need treatment for sure 😅. Question: diffusion on ceiling will disturb feeling of distance. How does that work with Dolby Atmos where accurate placement of sound objects is key?
We are building a new Atmos studio and will report on this very issue through the summer.
Mr Foley... you've stated the space between the front mains is sacred ground, meaning nothing should be there. Well, what is your answer to a 5.1 theater setup, when the main attraction is the 60" screen that just so happens to be (your favorite material) "glass"? If your comments weren't available to me, I would just locate my mains and center slightly behind the screen, with absorption behind them. Any comment is always welcome!
You can not located speakers behind the screen. It does nothing to tame the reflections from the screen. You need to treat the edges of the screens to minimize reflections from hard surfaces..
wow. you just gave me so much clarity for my setup! subscribed!
A, You are welcome.
so mix / mastering rooms diffusion for ceiling at the first reflection points?
It depends on the engineer's preference and the music mixed. Most studios we do the diffusion is limited to the rear walls.
ty Dennis, you are doing a great in general underestimated job!
Z, Thank you for your support.
Thanks for this wealth of info!
Question: how would handle the ceiling and related surfaces for an ATMOS 7.1.4, specifically related to the 4 monitors on the ceiling for mixing and mastering?
Also, are you planning on doing an immersive / ATMOS video. We are in the process of doing the world’s first DXD/DSD 256+ ATMOS mixing and mastering studio. We are testing the software and hardware currently in our media lab, which we plan to retrofit from its current +/- 5 dB with a few resonance spikes to a more optimized facility. The results of this in terms of what we learn and improve upon will be going into a next generation studio being built as we speak, which will be done by January 2023.
More full range energy from floor to ceiling means greater pressure problems in the room's smallest dimension.
@@AcousticFields So, i guess you’d recommend additional tuned HHoltz LF absorption at the low end, and a bit more diffusion and acoustic mat absorption on the ceiling between them- or some variation on that?
First of all, thank you for this video! I didn‘t quite catch though the part about ceiling treatment for Mixing & Mastering. Is it better to just diffuse, if the ceiling isn‘t that high and the room not that huge or is it better to mix diffusion and absorption for this kind of room?
A, It depends on what type of music you are mixing and what impact you want the ceiling to play in the mix.
Acoustic Fields Thank you for the quick response! I‘ll rather mix Synthpop and Rock then heavily limited music like Hip Hop or the new EDM genres. The ceiling is about 240cm high and I try to have a clean and organic mixing space for rather classical mixing and less „everything in your face“ mix. Hope this helps clarifying what I‘m aiming for! Greetings from Hamburg, Germany. :)
Appreciate this amount of information these days. I am building a 4x4 with 7 a foot ceiling, for voice I am going to try this, do you think the recordings will sound dry enough, yet open?
The 7' ceiling height will produce issues that can not be overcome especially if amplitudes (strength) of the sound source increases. Unfortunately, the room is too small for diffusion.
WOW What an informative vid!
Hi Dominik, Thank you for your following.
Excuse me Sir, So my budget is small so i have a room that include : Bed room, playing music and record , and my room size is : Height :285cm,Lenght:360cm,Width:276cm, Can i ask you a question ? : My room is what kind of room is belong 6 types of room as you listed above , if My room not fit at all that , so can i have a reccomand for where to place Absorption/Diffusion?.Thanks so much sir. Sincerely.
C, Stay with low,middle, high frequency absorption for this room size. Place it on all four walls.
@@AcousticFields Thank you so much :)
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Thank you.
Is it possible to create a Good Live AND Listening space in One room?
20x30x10-ceilings
L, Yes, you must use a variable acoustic treatment system where you have the flexibility to move things around.
Cool videos Im a huge fan !!!
Hi Joe, Thanks for your support. If you have a topic you wished covered, let us know.
4:57 I used absorption at the front of my HT room and it sounded great before the 120" screen was hung (e.g.- RT-60 tripled from 0.4 to 1.2). Would diffusion on the drop ceiling help mitigate comb filtering?
B, When you covered your front wall with the screen, you reduced the air flow over the sound absorption material. Reduced air flow means reduced absorption.performance when you are dealing with middle and higher frequencies. You must get the Rt-60 times under control before you worry about comb filtering. You must cover the same surface area on the ceiling that you lost with the screen.
So the "Voice" part applies on a vocal recording soundbooth too but not too small right?
L, Voice and music are different. What are you trying to accomplish?
@@AcousticFields To make the highest frequencies possible live in a drywall soundbooth that is already like around 70% covered with 2" inch wedge tiles acoustic foam with a good NRC so vocals sounds just a liiittle boxy but not too much, im even impressed that almost doesnt sounds boxy sound but the vocals sounds a little dead. The thing is that if I remove a few foam tiles, then I'll hear reflections . Is a soundbooth just for vocals but im like obsessed to know if I really need any type of diffusers inside like Skyline type or Quadratic small or big because I really know how diffusion works. The soundbooth is around 9ft height, 6ft width and 9ft length (which is facing me and backwards). I really appreciate your response Dennis! and thanks.
Thank you for this breakdown. For the "voice" - would that also apply to voiceover work? Or just vocals?
C, Any recording done in a room with a microphone.
Thank you!
C, Both are voice.
Hello, I just watched your series. May you help me explain clearer about diffusion frequency by room volume for front and rear wall in listening? Any example? Thanks!
Diffusion prime numbers are based upon distance from diffuser to listening position. You must have enough distance for the lowest waveforms to fully form.
My entire rear wall is glass. Are great acoustics impossible or can i use absorption or diffusion to save it?
K, It depends on usage and distance. Fill out the information in this link and let's take a look: www.acousticfields.com/free-room-analysis/
Umm, I am "listening" to music in a hometheater setup. Would that mean a) diffusion panels on the back wall b) absorption panels behind the tv and c) diffusion panels behind the speakers on the front wall (front speakers are a few feet on both sides of the tv). Another complication i have is....i listen to music on a 4.1 "multi stereo" setup in this room. My 2 surrounds are on the sides of the couch near the back wall. So essentially, the back wall acts like a side wall to the surround speakers. What would i do? ( i have a 2nd treated room for a 2 channel setup, i am clear on that. But, please provide some advise on my hometheater music room setup).
W, Home Theater / Listening room treatments must be specific to both usages. You can use absorption for front and sidewalls for both usages. You can use diffusion on the ceiling and rear walls for both usages.
@@AcousticFields Thank you!
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Thank you.