For the next knowledge bomb!!! - Please talk about Dennis Foley and Acoustic Fields' diaphragmatic bass absorbers (ACDA-10 and ACDA-12)... is it all voodoo!?
It doesn't seem like it assuming the measurements on the website are accurate. Though I've never tried the product myself. Would love to but I can't afford it at the moment. Hehe
@@djhmax09 no, I don’t trust him for some reason and I built my studio from the ground up thinking about acoustics and the massive amount of bass traps and diffusers I would need to make it sound good… I still have a dip at 130hz which is SBIR problem that I need to fix, but other then that I love the sound in there… paying somebody to do it and to use his products would cost a fortune, I rather do it DIY
Thank you for all the knowledge! I have a question for the next bomb: I'm moving my studio to another room which is rectangular with the door in one of the corners. In your opinion, what's the better compromise: filling 3 of the 4 corners with floor-to-ceiling bass traps for more absorption, or leaving 2 corners untrapped for more LR symmetry?
Good question, symmetry is vital, especially left/right symmetry. However in this scenario, it would depend on the layout and proximity to the mix position. I've seen and built myself both diffusion and absorption panels onto the door itself.
Man. This is more pure gold! I've been hung up on copying a friend's studio design concept in my space (sent questions and stuff in the course) and your comments about doing things in perfectly prepped spaces vs most of our real-world situation has gotten me off that. I'm all in to do my room with your diffuser bass traps, getting as many in there as possible, and working from there to get things set up and working. Basing everything in measurable, scientific concepts is so great.
late comment here, but a definite big up for a walkthrough on the different control room designs!!! I’ve been going through the control room section of the fifth edition of the Master Handbook Of Acoustics by Everest and Pohlmann recently, but I would absolutely watch the shit out of your analysis and overview in this video talking format! Cheers! ❤
The way I understand it, the thickness of the material matters. So the very thin plastic (below 0.1mm thickness) will stop very high frequencies from getting into the material, but this will not be significant for frequencies below 10-20kHz. If you get a non-breathable fabric with higher thickness, 1 mm and up I guess, then the affected frequencies will become significant enough to hinder your ability to mix high end.
11:56 Thank you! Yes,that would be cool! This is what I am looking for exactly. Those crossed wooden sheets in the wall... I want to know about how they designed,the size,the physics.
It's interesting because there's a lot of debate in regards to speaker size vs room size. I noticed that, usually, bass methodology indicates it does not matter but those who have experience in building actual rooms in addition to some speaker manufacturers (such as REL) say it does. Who's right? I don't know. Maybe when looking at it in isolation it doesn't matter but when accounting for all these variables it does. I guess the best way is trial and error and see if you hear differences.
Hi. Enjoying the info and shared knowledge. I'd like to submit a question for future Knowledge Bombs. I've recently moved home, and have a new room to treat. It's small, slightly L shape, and has surprisingly bad acoustics in some positions. My last home studio was designed for digital production and mixing, but my needs have changed, now I need a more all purpose set-up, and not audio production based. I need decent vocal recording from the listening position, a multi visual monitor setup, and large, almost empty desk space. I'd like some external sound isolation, to reduce sound transmission to nearby rooms, and have good speaker placement without compromising my visual monitor position. I have nearfield audio monitors. Long list, I know, but this seems a high use case, a little bit of everything, with lots of constraints. What should be the priorities and compromises? I realise this is channel is more for recording / mixing / mastering use cases, but I think lots of people also have multi-use cases, that also need to be living spaces. Just an idea.
Wrapping the wool in plastic makes no sense....i actually tried it for the same reasons , yet ended with panels that not only rejected most of the high end flutter, but some low end as well....😵 Bass also needs to hit a soft material , ideally many fibers scattered together, would be of greater effect, it`s all trial and error. There are many myths out there, one guy says this, one says the other, the only good results i had was by making them myself over the years, using different materials, like couch foam, fiberglass, rockwool, actual animal wool, and changed different material types, tried putting them with an air gap, tried without, tried different sizes, depths and wrapping methods. At the end of the day, the best materials were in this order : 1.Very dense sponge(almost close to rubber) 2.Rockwool 3.Fiberglass 4.Thick blankets and towels 5."Studio Foam" which is basically useless Now, for the wrapping material, try not to use stuff that`s made of polyester, it`s the same effect as using plastic . Better is to use cotton that is pretty rigid, so that you can stretch it right so you don`t get any bloating of the panels , or even worse, having it too loose 😱. The absolute best is the stuff used for making t-shirts, but it will rip easily and it stretches a lot, so...use cotton ! Quick tip for guys who don`t care about cost, there is something better than rockwool and that is 100% safe , ENVIZOL . Just...google it :D
Hey Jesco, love your content, very helpful! Got one question for the next bomb: Would bass traps as speaker stands be useful? There's quite a few bass traps (e.g. Hofa) that can serve as nice stands. I am wondering if the positioning of those bass traps underneath speakers and away from the walls would still make them useful. Thank you and keep up the good job!
hello.nice channel buddy ! here is a weird question...i never really made a measurement but will do it soon => if you crack the windows of the room (if you live in a quiet area) this going to solve the air presure inside,but is this going to solve some of the standing waves issue,or this is only a presure related thing ? keep up the good work !
I wrapped rockwool in my absorbers with plastic foil and have been wondering for months was it a mistake, because I was back then only getting into acoutics. It seemed reasonable not to have that rockwool dust flying around my room and to be honest, at that moment, I wasn't thinking about it reflecting any frequencies. The funny thing is that many people, even some very knowledgable and experienced people in acoustics will tell you that the air must go through the material, otherwise it's not effective. And that's just wrong. My room wouldn't sound like a treated room at all then!
Thats funny, I did the same (wrapped Rockwool in very thin plastic foil) and after building I had doubts that this is wrong. Then I asked Thomas of Northward Acoustics (on of the most intelligent guys of acoustics) if this is a problem, and he said yes! He said the air must go through (into the material). Uff... But like you I still could recognise improvements with the wrapped Absorbers, but since then I am wondering how much better it would be without plastic foil.
Great Vids! To the Qustion about the Plasticwrapping of insolation: I am used to use "Baumwollnesselstoff" (Raw Cooton like a Sealtowel )as Wrapping-Material for Panels. For my Big BassTrap i left at First the Plasticwrapping from the Factory on. But i wasnt sure exactly about the Efficiency of Bass Absorbing. What i learnd by that was, that its very importend to make sure, that the Air can flow trough the Wrapping Material. Is there no Problem in Panels when they should absorb also higher Frequencys? Thx
Yeah a Studio Designs series would be very awesome! To see the different concepts and philosophies of great minds! Of course there is to be an episode about Northward Acoustics! Their rooms are probably the more advanced design right now!
What kind of plastic specifically do you use to wrap the insulation material in panels? And how do you apply it? Is it heat shrink wrap and a large wire heating element to seal the ends and sides?
hey jesco, pls talk about cheap vs expensive studio monitors. is the difference of a pair of cheap yamahas or jbls that great, compared to neumann 310s, barefoots, genelec the ones, etc? i guess for the first years learning piano, a steinway doesn't give you anything useful compared to the cheapest yamaha piano right? the main question is i guess, are jbl lsr305 or yamaha hs series that bad really with port ringing, etc. now that i got so many high end and expensive plugins, i honestly realized i could get along with the most basic stuff just fine, except some very rare and specific stuff.
What do you think about the PSI Audio Avaa C 20 Active Bass Traps? They look like the perfect solution for low end control in home studios, unfortunately as you need to use more than one they are prohibitively expensive for me. Is something like this inherently expensive to produce and do you think it is likely that we may see a much more affordable mass produced version of an active bass trap in the future coming from other companies?
Very nice video. In the section where you mention that you wrap the panels with thin foil of plastic, i have heard from some nerds that we can also use geotextile for wrapping and then put the fabric. Are you aware of that? Would you suggest it? Thanks
I saw some tutorials that wrapped the absorption material in quite thick black trash bags for the reason of health and also to reflect highs so the room doesn’t get too dead. Is that senseless or actually a good idea?
9:15 Can woofer smaller than 8" produce real bass? What is real bass? It would be more a more difficult to go lower and lower in frequency distortion free with the same SPL as for higher frequencies.
You're right, it's challenging for any sized woofer to maintain a specific output level as the frequency decreases. Theoretically, 4x the stroke is needed to maintain a given level and reproduce an octave lower. However, driver diameter has zero relationship to it's low freq extension, -3dB point. No connection. Jesco's example of an earbud's ability to extend down to 20hz and below, is spot on (I often use the same example). However a driver's swept volume, Vd (Sd • Xmax) determines it's overall capabilities for adequate LF in a given environment.
Any thoughts on using a diluted solution of PVA glue and water, to spray the insulation panels to "fix" the fibers (as opposed to using a thin plastic wrap)?
Hi!. Thanks for a great video. Have you test Psi Audio Avaa C20 active bass trap?. They are pretty small and can trap from 15 to 150hz, they cost quite a lot but can fit small room, do you have any thoughts on that?. Best/Mathias
What do you prefer from acoustics prepective? Windows or glass doors to see from the control room to the live(s) room(s) or a very good camera and TV setup in each room?
Very informative as always… would you recommend the GIK tuned membrane bass traps. The T40’s tuned to 30 hz are the ones I’m considering getting, I’ve a very small box bedroom and from any reading I’ve done (Bobby Owsinski etc) it’s all about absorption, absorption, absorption… I can’t afford the PSI active bass traps and figure the lower the absorption frequency the better. At the moment I have 2 Hofa baby bass traps, 8 Auralex LENRD bass traps and 9 Addictive Sound premium absorbers 100 x 50 x 11 cm covering the first & second reflection points including rear wall and the window directly behind the monitors. I’m really stuck regarding the listening position so I’m trying the best I can within the space I’ve got, thanks in advance
I have heard you give the balloon / pressure explanation a few times with regards to a room being too small to produce low frequencies, but I still don't quite understand. You say a small room that does not allow the full wavelength cycle to complete, will mean there will be no standing waves at that frequency and below, which makes sense and to me sounds like a good thing, as standing waves are bad right? However, you say that what it will do is put more pressure in the room, like a ballon in a box, which sounds like a bad thing? Can you explain if small rooms are bad or good for bass? How does this pressure manifest itself audibly? We know standing waves means a build up of those frequencies. Thanks.
Standing waves mean the pressure (perceived level) varies at different points in the room. Frequencies with wavelengths too long to produce standing waves will result in a more even level (and quieter due to lack of ‘modal support’) throughout the space
I agree, the ballon analogy isn't as clear as it could be (a rare mis-step for Jesco;) Pressure Vessel Gain (PVG) is the scenario whereby the longest dimension of the room can no longer support full propagation of the waveform. Below the room's fundamental mode, propagation transitions to pressurization. The manner in which the sound is reproduced into the space changes from a normal cyclic propagation, to pressurization because the wavelengths are too big for the space. Note; the temporary pressurization is followed by rarefaction, etc., etc... The frequency at which this occurs is approximately the point whereby half the wavelength of a given frequency is equal to the rooms longest dimension. So, a 20 hz frequency has a wavelength 56.5 feet (17m). Half of that, 28.25 feet (8.5m), is the point of transition. Any frequency below that point pressurizes the room, and any frequency above that point propagates freely. In this theoretical room that's approximately 28 feet (8.5m) in the longest dimension, from 20 hz downward, the room gives back acoustically. At this frequency, the results are a gain in acoustic pressures in the room that grows as the frequency decreases. This acoustic support reciprocity, is theoretically 12dB per octave. The percentage of the 12dB/octave gain one achieves, entirely depends on the integrity of the boundary walls and surfaces. If it was the theoretical concrete bunker, close to a full 12dB/octave boost would occur. Typically, somewhere between 6-10dB octave could result. Also, in addition to the walls and surfaces flexing, other aspects may affect the point at which room gain begins. Furniture, cabinets etc, anything that consumes a certain measure of cubic feet, may slightly alter the transition frequency merely because the items take up space. * A fascinating element to PVG, is that the fundamental frequency is supported more than the distortion harmonics above... quite beneficial... as reproduction of the deep stuff is mammothly challenging for the entire system. I know that's a ton, I hope that helps.
Hi Jesco! Happy New Year! I hope you keep releasing this amazing videos in 2022! To a next episode.. What is you opinion on Bastotect! This material is pretty amazing in just helping me taming my desk reflections.. 10X better than any foam.. I have bass traps and acoustic panels but the on thing that was messing my mids/highs was the table reflections... i bought some put one on the ceiling (i cant put rockwool because of holes on ceiling) and on the table.. and bang!! no more com filters from the desk.. Cheers!
I have a closet door in the corner of the room that resonants at sub F notes. How should I go about dampening the door, I'm renting and can't permanently damage the door. I do have butyl rubber from treating my car I figure that may work but would likely damage the door. Any advice?
I don't get that Home Studio Treatment Framework back to my email even though I subscribed and followed every step - it just don't work for me, any other option? I tried 3 different emails
There are some light spray adhesives I've heard of being used. But you're probably better off just putting on a basic dust mask and gloves (gloves are less necessary for mineral wool than fiberglass) and doing the thin plastic wrapping. I'd like to find the recorded weight of plastic, myself. I'll probably build my own panels wrapped with 0.7mil plastic at first, since that seems pretty thin, and borderline fragile.
![Tee Grizzley - Robbery 8 [Official Video]](http://i.ytimg.com/vi/34_vkNV6wrU/mqdefault.jpg)
For the next knowledge bomb!!! - Please talk about Dennis Foley and Acoustic Fields' diaphragmatic bass absorbers (ACDA-10 and ACDA-12)... is it all voodoo!?
It doesn't seem like it assuming the measurements on the website are accurate. Though I've never tried the product myself. Would love to but I can't afford it at the moment. Hehe
Dennis always sounds like snake oil seller with his videos. He knows the problems but never offer solutions other then his overpriced products…
@@TomislavRupic well have you tried his products? I've never tried them but I like to keep an open mind. If it doesn't work then it doesn't work.
@@djhmax09 no, I don’t trust him for some reason and I built my studio from the ground up thinking about acoustics and the massive amount of bass traps and diffusers I would need to make it sound good… I still have a dip at 130hz which is SBIR problem that I need to fix, but other then that I love the sound in there… paying somebody to do it and to use his products would cost a fortune, I rather do it DIY
@@TomislavRupic well that's awesome. good on you for doing it yourself!
a video about differing control room designs and the pros/cons would be terrific!
Thank you for all the knowledge! I have a question for the next bomb: I'm moving my studio to another room which is rectangular with the door in one of the corners. In your opinion, what's the better compromise: filling 3 of the 4 corners with floor-to-ceiling bass traps for more absorption, or leaving 2 corners untrapped for more LR symmetry?
This is something I would also like to know being in the same situation.
Good question, symmetry is vital, especially left/right symmetry.
However in this scenario, it would depend on the layout and proximity to the mix position.
I've seen and built myself both diffusion and absorption panels onto the door itself.
Definitely would like a video discussing the different studio types
Dankeschoen from an ex-German in Adelaide. Thanks for debunking so much BS in your videos, I really enjoy your scientific approach.
Man. This is more pure gold! I've been hung up on copying a friend's studio design concept in my space (sent questions and stuff in the course) and your comments about doing things in perfectly prepped spaces vs most of our real-world situation has gotten me off that. I'm all in to do my room with your diffuser bass traps, getting as many in there as possible, and working from there to get things set up and working. Basing everything in measurable, scientific concepts is so great.
late comment here, but a definite big up for a walkthrough on the different control room designs!!! I’ve been going through the control room section of the fifth edition of the Master Handbook Of Acoustics by Everest and Pohlmann recently, but I would absolutely watch the shit out of your analysis and overview in this video talking format! Cheers! ❤
Good read on studio desks with clear measurments demonstrating before vs after
Thanks so much for making these. I’m new to acoustics and I’ve been learning so much thanks to your channel. Please keep these coming!
If you can wrap a porous absorber in plastic, what's the point of breathable fabrics?
The way I understand it, the thickness of the material matters. So the very thin plastic (below 0.1mm thickness) will stop very high frequencies from getting into the material, but this will not be significant for frequencies below 10-20kHz. If you get a non-breathable fabric with higher thickness, 1 mm and up I guess, then the affected frequencies will become significant enough to hinder your ability to mix high end.
Awesome stuff Jesco, as always. Keep it up !
André
Best Knowledge Bomb so far 👍🏻
Thank you 🙏🏻
Yes. A video on LEDE control rooms and various types would be excellent! Sorry for late response! What would the speaker size be best in?
Happy New year, looking forward to your videos this year.
11:56 Thank you! Yes,that would be cool! This is what I am looking for exactly. Those crossed wooden sheets in the wall... I want to know about how they designed,the size,the physics.
Oh different styles of controlrooms/live rooms would be really nice.
If possible, soundexamples would be amazing.
It's interesting because there's a lot of debate in regards to speaker size vs room size. I noticed that, usually, bass methodology indicates it does not matter but those who have experience in building actual rooms in addition to some speaker manufacturers (such as REL) say it does. Who's right? I don't know. Maybe when looking at it in isolation it doesn't matter but when accounting for all these variables it does. I guess the best way is trial and error and see if you hear differences.
Hi. Enjoying the info and shared knowledge. I'd like to submit a question for future Knowledge Bombs.
I've recently moved home, and have a new room to treat. It's small, slightly L shape, and has surprisingly bad acoustics in some positions. My last home studio was designed for digital production and mixing, but my needs have changed, now I need a more all purpose set-up, and not audio production based. I need decent vocal recording from the listening position, a multi visual monitor setup, and large, almost empty desk space. I'd like some external sound isolation, to reduce sound transmission to nearby rooms, and have good speaker placement without compromising my visual monitor position. I have nearfield audio monitors.
Long list, I know, but this seems a high use case, a little bit of everything, with lots of constraints. What should be the priorities and compromises?
I realise this is channel is more for recording / mixing / mastering use cases, but I think lots of people also have multi-use cases, that also need to be living spaces.
Just an idea.
Wrapping the wool in plastic makes no sense....i actually tried it for the same reasons , yet ended with panels that not only rejected most of the high end flutter, but some low end as well....😵
Bass also needs to hit a soft material , ideally many fibers scattered together, would be of greater effect, it`s all trial and error. There are many myths out there, one guy says this, one says the other, the only good results i had was by making them myself over the years, using different materials, like couch foam, fiberglass, rockwool, actual animal wool, and changed different material types, tried putting them with an air gap, tried without, tried different sizes, depths and wrapping methods.
At the end of the day, the best materials were in this order :
1.Very dense sponge(almost close to rubber)
2.Rockwool
3.Fiberglass
4.Thick blankets and towels
5."Studio Foam" which is basically useless
Now, for the wrapping material, try not to use stuff that`s made of polyester, it`s the same effect as using plastic . Better is to use cotton that is pretty rigid, so that you can stretch it right so you don`t get any bloating of the panels , or even worse, having it too loose 😱. The absolute best is the stuff used for making t-shirts, but it will rip easily and it stretches a lot, so...use cotton !
Quick tip for guys who don`t care about cost, there is something better than rockwool and that is 100% safe , ENVIZOL . Just...google it :D
Hey Jesco, love your content, very helpful!
Got one question for the next bomb: Would bass traps as speaker stands be useful? There's quite a few bass traps (e.g. Hofa) that can serve as nice stands. I am wondering if the positioning of those bass traps underneath speakers and away from the walls would still make them useful.
Thank you and keep up the good job!
hello.nice channel buddy ! here is a weird question...i never really made a measurement but will do it soon =>
if you crack the windows of the room (if you live in a quiet area) this going to solve the air presure inside,but is this going to solve some of the standing waves issue,or this is only a presure related thing ?
keep up the good work !
I wrapped rockwool in my absorbers with plastic foil and have been wondering for months was it a mistake, because I was back then only getting into acoutics.
It seemed reasonable not to have that rockwool dust flying around my room and to be honest, at that moment, I wasn't thinking about it reflecting any frequencies.
The funny thing is that many people, even some very knowledgable and experienced people in acoustics will tell you that the air must go through the material, otherwise it's not effective.
And that's just wrong. My room wouldn't sound like a treated room at all then!
Thats funny, I did the same (wrapped Rockwool in very thin plastic foil) and after building I had doubts that this is wrong. Then I asked Thomas of Northward Acoustics (on of the most intelligent guys of acoustics) if this is a problem, and he said yes! He said the air must go through (into the material). Uff... But like you I still could recognise improvements with the wrapped Absorbers, but since then I am wondering how much better it would be without plastic foil.
Great Vids! To the Qustion about the Plasticwrapping of insolation: I am used to use "Baumwollnesselstoff" (Raw Cooton like a Sealtowel )as Wrapping-Material for Panels. For my Big BassTrap i left at First the Plasticwrapping from the Factory on. But i wasnt sure exactly about the Efficiency of Bass Absorbing. What i learnd by that was, that its very importend to make sure, that the Air can flow trough the Wrapping Material. Is there no Problem in Panels when they should absorb also higher Frequencys? Thx
Should I buy your new course if I’m just planning to record vocals in my room?
Happy New Year, Jesco! Keep up the good work, I hope you get well soon!
Love your channel
Yeah a Studio Designs series would be very awesome! To see the different concepts and philosophies of great minds! Of course there is to be an episode about Northward Acoustics! Their rooms are probably the more advanced design right now!
What kind of plastic specifically do you use to wrap the insulation material in panels? And how do you apply it? Is it heat shrink wrap and a large wire heating element to seal the ends and sides?
Hey, frohes Neues! Kommt irgendwann auch mal was auf Deutsch? Ich verstehe zwar 90% aber entspannter wäre es auf Deutsch xD
hey jesco, pls talk about cheap vs expensive studio monitors. is the difference of a pair of cheap yamahas or jbls that great, compared to neumann 310s, barefoots, genelec the ones, etc? i guess for the first years learning piano, a steinway doesn't give you anything useful compared to the cheapest yamaha piano right? the main question is i guess, are jbl lsr305 or yamaha hs series that bad really with port ringing, etc. now that i got so many high end and expensive plugins, i honestly realized i could get along with the most basic stuff just fine, except some very rare and specific stuff.
What do you think about the PSI Audio Avaa C 20 Active Bass Traps?
They look like the perfect solution for low end control in home studios, unfortunately as you need to use more than one they are prohibitively expensive for me. Is something like this inherently expensive to produce and do you think it is likely that we may see a much more affordable mass produced version of an active bass trap in the future coming from other companies?
Very nice video. In the section where you mention that you wrap the panels with thin foil of plastic, i have heard from some nerds that we can also use geotextile for wrapping and then put the fabric. Are you aware of that? Would you suggest it? Thanks
I saw some tutorials that wrapped the absorption material in quite thick black trash bags for the reason of health and also to reflect highs so the room doesn’t get too dead. Is that senseless or actually a good idea?
9:15 Can woofer smaller than 8" produce real bass? What is real bass? It would be more a more difficult to go lower and lower in frequency distortion free with the same SPL as for higher frequencies.
You're right, it's challenging for any sized woofer to maintain a specific output level as the frequency decreases.
Theoretically, 4x the stroke is needed to maintain a given level and reproduce an octave lower.
However, driver diameter has zero relationship to it's low freq extension, -3dB point.
No connection.
Jesco's example of an earbud's ability to extend down to 20hz and below, is spot on (I often use the same example).
However a driver's swept volume, Vd (Sd • Xmax) determines it's overall capabilities for adequate LF in a given environment.
Any thoughts on using a diluted solution of PVA glue and water, to spray the insulation panels to "fix" the fibers (as opposed to using a thin plastic wrap)?
Hi!. Thanks for a great video. Have you test Psi Audio Avaa C20 active bass trap?. They are pretty small and can trap from 15 to 150hz, they cost quite a lot but can fit small room, do you have any thoughts on that?. Best/Mathias
What do you prefer from acoustics prepective? Windows or glass doors to see from the control room to the live(s) room(s) or a very good camera and TV setup in each room?
Very informative as always… would you recommend the GIK tuned membrane bass traps. The T40’s tuned to 30 hz are the ones I’m considering getting, I’ve a very small box bedroom and from any reading I’ve done (Bobby Owsinski etc) it’s all about absorption, absorption, absorption… I can’t afford the PSI active bass traps and figure the lower the absorption frequency the better. At the moment I have 2 Hofa baby bass traps, 8 Auralex LENRD bass traps and 9 Addictive Sound premium absorbers 100 x 50 x 11 cm covering the first & second reflection points including rear wall and the window directly behind the monitors. I’m really stuck regarding the listening position so I’m trying the best I can within the space I’ve got, thanks in advance
I have heard you give the balloon / pressure explanation a few times with regards to a room being too small to produce low frequencies, but I still don't quite understand. You say a small room that does not allow the full wavelength cycle to complete, will mean there will be no standing waves at that frequency and below, which makes sense and to me sounds like a good thing, as standing waves are bad right? However, you say that what it will do is put more pressure in the room, like a ballon in a box, which sounds like a bad thing? Can you explain if small rooms are bad or good for bass? How does this pressure manifest itself audibly? We know standing waves means a build up of those frequencies. Thanks.
Standing waves mean the pressure (perceived level) varies at different points in the room. Frequencies with wavelengths too long to produce standing waves will result in a more even level (and quieter due to lack of ‘modal support’) throughout the space
I agree, the ballon analogy isn't as clear as it could be (a rare mis-step for Jesco;)
Pressure Vessel Gain (PVG) is the scenario whereby the longest dimension of the room can no longer support full propagation of the waveform.
Below the room's fundamental mode, propagation transitions to pressurization. The manner in which the sound is reproduced into the space changes from a normal cyclic propagation, to pressurization because the wavelengths are too big for the space.
Note; the temporary pressurization is followed by rarefaction, etc., etc...
The frequency at which this occurs is approximately the point whereby half the wavelength of a given frequency is equal to the rooms longest dimension.
So, a 20 hz frequency has a wavelength 56.5 feet (17m). Half of that, 28.25 feet (8.5m), is the point of transition.
Any frequency below that point pressurizes the room, and any frequency above that point propagates freely.
In this theoretical room that's approximately 28 feet (8.5m) in the longest dimension, from 20 hz downward, the room gives back acoustically.
At this frequency, the results are a gain in acoustic pressures in the room that grows as the frequency decreases. This acoustic support reciprocity, is theoretically 12dB per octave. The percentage of the 12dB/octave gain one achieves, entirely depends on the integrity of the boundary walls and surfaces.
If it was the theoretical concrete bunker, close to a full 12dB/octave boost would occur.
Typically, somewhere between 6-10dB octave could result. Also, in addition to the walls and surfaces flexing, other aspects may affect the point at which room gain begins. Furniture, cabinets etc, anything that consumes a certain measure of cubic feet, may slightly alter the transition frequency merely because the items take up space.
* A fascinating element to PVG, is that the fundamental frequency is supported more than the distortion harmonics above... quite beneficial... as reproduction of the deep stuff is mammothly challenging for the entire system.
I know that's a ton, I hope that helps.
Hi Jesco! Happy New Year! I hope you keep releasing this amazing videos in 2022! To a next episode.. What is you opinion on Bastotect! This material is pretty amazing in just helping me taming my desk reflections.. 10X better than any foam.. I have bass traps and acoustic panels but the on thing that was messing my mids/highs was the table reflections... i bought some put one on the ceiling (i cant put rockwool because of holes on ceiling) and on the table.. and bang!! no more com filters from the desk.. Cheers!
I have a closet door in the corner of the room that resonants at sub F notes. How should I go about dampening the door, I'm renting and can't permanently damage the door. I do have butyl rubber from treating my car I figure that may work but would likely damage the door. Any advice?
Decided to switch accounts in case I want to ask some questions! lol
I don't get that Home Studio Treatment Framework back to my email even though I subscribed and followed every step - it just don't work for me, any other option? I tried 3 different emails
Thank you Jesco !!!
Can you buy a spray for the panels rather than plastic wrap for health and safety? Or, can you buy the panels with the plastic wrap already applied?
There are some light spray adhesives I've heard of being used. But you're probably better off just putting on a basic dust mask and gloves (gloves are less necessary for mineral wool than fiberglass) and doing the thin plastic wrapping. I'd like to find the recorded weight of plastic, myself. I'll probably build my own panels wrapped with 0.7mil plastic at first, since that seems pretty thin, and borderline fragile.