As a musician who has significant hearing loss, listening to TH-cam videos through earbuds for the last three hours, I'm struck by how clear and beautiful the sound of this video is compared to all the other videos I've watched today. Good to know there are people who understand and care about sound.
Nice video production. I really liked the visual examples and education on how bass works in rooms. You've said that porous absorption is not effective under 200 Hz though, and that's just untrue. If that was true, and the only thing that worked were pressure-based treatments, then you'd never see professional studio builders filling their rooms with rock wool and fiberglass at depths up to several meters. Those treatments absolutely work, way down to 30 Hz, when you build them with correct depth and density. I can support that statement with a real world experience and acoustic testing data. It's definitely correct that as particle velocity decreases the effectiveness of porous treatments declines, that's why airgaps are used. Even without airgaps, fiberglass can damp room modes down very low in the LF. In my control room we have a front-back axial room mode of 35 Hz that we treated with 1 m of fiberglass and slats. The low end is completely controlled. And of course pressure treatments have their place and use. But it's off base to claim that under the Schroeder frequency you cannot use porous absorption. People like myself are doing it with excellent effectiveness.
Thanks a million John, I saw one of your videos about speaker isolation a couple of days ago and I decided to test it. Went and bought rubber cushions for my mains and sub woofer. The difference is night and day. Magic 👌🏾👌🏾
Hey man, these are also extremely useful resources for studying the science of sound and recording if you're interested. th-cam.com/users/geoffgmartinvideos th-cam.com/channels/N5UUY5P4IO1nCuQSfo-Uug.html th-cam.com/channels/SCwzZX29jTILlsP4MhjQvg.html
Same! (Fun fact, by the way, if you put a sub in and facing a corner with an obstruction (like cabinets) a few feet above it, the output is greatly increased throughout the room with fewer noticeable modes. It's the same with putting it under a desk or something like that. The modes even out to give more accurate output. Why do I know this? Testing! How does it work? Reverb I guess. I don't know.)
Great videos! Informative and made easy to understand. I'd love to see a video about the acoustics in a round room. I have a such room with a sound system and I'm having a hard time to understand how to manage the acoustics. It seems like the sound bounces in an almost chaotic way to different directions.
It still works in a similar way to a rectangular room at low frequencies, except for the length and width are identical every which way, meaning there is one very strong horizontal room mode right in the centre rather than many weaker ones.
Exceptional video! But what have "I" learned??? That I am not going to be able to sound treat my living room unless I buy expensive accoustic panels that must be placed by expensive specialists who know what they are doing....Oh well...
I agree. Interesting video but no help whatsoever with setting up my hi fi system and in particular my sub woofers. well its back to good old trial and error for set up.
@@johngarbutt I agree guys, there is some nice knowledge in here, but as for me and my setup, this doesn't really do much for me other than to play around with my own testing of acoustical materials and where place them in the room and then for the hours of listening tests as in A to B and back to A....
2021: Acoustic Engineer consultant Designed my music room w/grand pianos(2) 25x35'. It is not s rectangle but has built up corner absorbers; w/Glass Blocks to absorb 50% Street bus noises. Sound travels 100'/sec
Absorbing the room effects... Does that also increase the sound pressures in certain areas that were otherwise cancelledbout by a room effect? I.e. Lower spl at resonance, and higher spl at a null?
So these are a broadband membrane absorber ? I thought membrane absorbers only worked in a very narrow band and need to be build to for the room after extensive testing ?
Awesome content! By chance could you do a video on a round room? Or a Yurt Shape? I am helping a friend build a Yurt recording Studio and struggling to find much information on the general acoustic response of the rooms. Thanks for any help and the great knowledge you've put out! Cheers!
Round is the second worst geometry for a sound room after sphere. It hugely magnifies one or two frequencies beyond repair. I'd advise against it. Thanks, John Calder
This is a great video breaking down the complex topic. I just wish you'd have given credit to the proper name, and credited the discoverer, of the Schroeder frequency.
when i look at the room correction results on my avr i can see there is a huge dip in response at around 80hz from a bunch of channels that dip also did not get corrected by the room correction. is that a room mode problem or a null as the video talked about?
Would sound high intensity create tsunami too? Possible and by superposition freeway and drainage design accurately could be able to generate tsunami from freeway traffic
Some engeneer told a solution to avoid room issues on bass response is to put a line of bass speakers on 3/4 of roomhight....Infinity IRS applied this with their 6 x 12" bass speakers ....?!
When you say velocity based absorbers (fiberglass and rockwool) aren't effective under 200, do you mean not effective at the same depth as pressure based absorbers or do you mean its inefficient use of the space in the room due to the depth you need for them to make a difference, or porous absorbers cant do under 200 hz even if they are a meter deep?
Thanks for your question, Casper - It's a good one. Fiber-based absorbers (and obviously foam) are ineffective compared to the relatively small size of membrane absorbers; fiber is also less efficient under 200Hz than membrane absorbers; and fiber must be placed in the additive mode points (the anti-node) to be somewhat more effective, which is usually in the useful space in a room. The "original bass traps" were designed by Tom Hidley to be used in high-end recording studios . They were about an additional 1/4 the size of the control room space (my estimate) and were an entire small room filled with fiberglass (lining the walls and covering a large number of "blades" hanging from the ceiling, with a slot-type "port" opening). These were effective, but obviously used a huge amount of expensive real estate. Properly designed membrane-based low-frequency absorbers (I really don't like the term "bass traps") are more efficient, are best used at boundary surfaces (thereby out of the way without using valuable room space), and end up being cost-effective.
at 0:45 the 6' tube resonance = 188 Hz at 1:46 there is a sweep from 188 Hz and down to 94 Hz The narrator says that below the modal range (188 Hz) bass can't fully develop while the video is very clear what happens. There is plenty of energy in the whole tube at 94 Hz at 1:52! Bass very obviously develops without any issue below the modal range. -There's plenty of bass inside a loudspeaker box. -We can hear the whole frequency range with earbuds, even if the modal range of the ear canal is at about 15kHz. 1:57 "the room crossover". This is the "transition range" (Schroeder frequency) and it indicates the area where the room transitions from Ray-based acoustics to the modal range where the sound is dictated by the room dimension. It is not "velocity based to pressure based" sound behavior. The pressure range is below the lowest mode of the room (the longest dimension of the room). Maybe what the narrator wants to say is that most typically, but certainly not all the time, it is beneficial to use pressure-based absorbers in the modal range. ...at least with regards to how much space the bass trap occupies. "Only accurately tested & lab-proven bass absorbers are known to work" That is a very strange statement. A Helmholtz resonator doesn't need to be tested for it to work. Just blow across the neck of a bottle... it works. Further: there's a reason why Sabine's numbers are just above 125 Hz (sometimes 63 Hz) and that is because, as the narrator said earlier in the video if a pressure-based absorber is placed in the wrong location, it has zero effect.
Hi Lars, thanks for your comments. When trying to explain complex topics simply, it becomes necessary to under-explain deeper parts of the topic; the goal of our video isn't a PhD. level course in room acoustics, it is an awareness that there is a lot going on at low frequencies in a room and that with some knowledge, reasonable choices can be made to improve one's listening space. The point of the Kundt's Tube demonstration in the video is that below the resonant frequency of that particular dimension, the wavelengths are too long to fully develop and as a result, the usual methods of absorbing sound to reduce resonance energy, which are wavelength-dependent, are far less effective. Of course there is energy in the room from the speaker or instrument - the point is that to control resonances, different methods must be used. Many research resources use the terminology "velocity-based" and "pressure-based" - I decided to go with those terms. Yes - there are other LF absorber choices, but they all use much more space and can be unpredictable unless fully tested in an acoustics lab accurate down to the target frequencies. As for Helmholtz resonators, I have two problems with them: 1) as air conditions (temperature and humidity) in a room change, so too will the resonant frequencies (speed of sound varies by temp...) - will the Helmholtz resonator track those changes linearly? 2) More importantly, why would anyone add a new resonance to an existing resonance? Sound transients will be destructively affected. Well-designed and accurately-tested membrane low-frequency absorbers work, and if properly placed, remain the best choice to mitigate room modes, IMHO. There's a lot of misinformation and bad or non-existent "bass trap" specifications in the marketplace; there are test results from laboratories that cannot be accurate below 150-200 Hz due to Schroeder frequency test room size limitations. I'm confident that more information, even if condensed into short videos like this one, is helpful in making purchasing decisions, whether for our products or for other manufacturers. I wish the industry would get its' act together and insist on accurate product testing and specifications for these areas. Thanks again for your insightful comments! John
While NWA did have some awesome bass, NWAA Labs in Elma, Washington is the best place to test bass absorbers and other acoustical products. 'Prolly can't do the six-fo tho. Maybe could measure the car's engine sound...
Great information and demonstration. But for a speaker system, a subwoofer array is always going to be the best solution to getting rid of room modes below 100Hz.
Multiple subwoofers placed optimally in a room are better than a single sub, but the room will affect the sound at low frequencies regardless of where and how many are in the room. Adding subs and "room EQ" will not remove resonances or the fact that below room crossover, wavelengths become pressure-based. Properly treating a room for low-frequency modes and then adding subwoofers is advised. Laws of physics...
@@johncalder8490 Room treatment is not the foundation for having great bass, but more like the cherry on top. Subwoofers and their proper placement and integration and subsequently room correction will get you to elite levels of bass performance. The frequency response dominates our perception of bass performance. Below 100Hz, subwoofers are required to fill in the nulls. And with 2 subs you can have null free bass in many rooms. Couple that with a good room correction like DIRAC and you have bass performance that is damn near perfect in the frequency domain and very good in the time domain. Can room treatment help improve things further? Sure, but all the leg work has already been done. And room treatment is so damn expensive that it becomes more cost effective to just buy more subs.
Cool video! I wonder if you can talk about some design solutions to these bass problems. Like, what would be the ideally dimensioned room for accurate bass? Or what about a room with no parallel walls? Would that make it easier to achieve accurate bass? Could the walls be fitted with textured shapes that disperse sound, or would it be better to just have them angled away from each other, or maybe both?
To answer that, you have to know ahead of time where the speakers and subs will be placed before the room dimensions can be optimized. See Floyd Toole.
Thanks for your questions! Designing a room without parallel walls and non-parallel floor-ceiling geometry is a great partial solution, and many recording studios and high-end listening rooms do just that. But volume-based low frequency resonances (the same effect as blowing across the top of an empty bottle) will continue to be a problem. Also, due to room crossover, there are no diffusion treatments that will diffuse wavelengths longer than the room dimensions. The best solution to room modes and bass resonances will include combining effective low frequency absorbers with optimal room geometry design (as well as optimizing speaker placements).
@@johncalder8490 Thanks for the answer. Is there a program you use to determine optimal speaker placement and absorber placement in a given room? Also does room crossover cease to be a problem if your room is large enough to contain any anticipated bass wavelengths?
I like how I learned something and was sold an ad at the same time.
😂
I had a stupid cadburys ad - if their chocolate wasn't so bloody expensive I would buy it
😂😂😂
YOU STINK
This demo knocks it out of the park explaining the acoustic anomalies associated with smaller rooms. Thanks so much for putting this together.
The use of props in this and every other video has been astounding. Props to you sir!
Ha! Nicely played!
I see what you did there
Like the irony👌
Prop squared!
As a musician who has significant hearing loss, listening to TH-cam videos through earbuds for the last three hours, I'm struck by how clear and beautiful the sound of this video is compared to all the other videos I've watched today. Good to know there are people who understand and care about sound.
Clear, concise, and easy to watch. Love it!
Keep making these videos! This channel and the people behind it are amazing
We appreciate the kind words!
Nice video production. I really liked the visual examples and education on how bass works in rooms. You've said that porous absorption is not effective under 200 Hz though, and that's just untrue. If that was true, and the only thing that worked were pressure-based treatments, then you'd never see professional studio builders filling their rooms with rock wool and fiberglass at depths up to several meters. Those treatments absolutely work, way down to 30 Hz, when you build them with correct depth and density. I can support that statement with a real world experience and acoustic testing data.
It's definitely correct that as particle velocity decreases the effectiveness of porous treatments declines, that's why airgaps are used. Even without airgaps, fiberglass can damp room modes down very low in the LF. In my control room we have a front-back axial room mode of 35 Hz that we treated with 1 m of fiberglass and slats. The low end is completely controlled.
And of course pressure treatments have their place and use. But it's off base to claim that under the Schroeder frequency you cannot use porous absorption. People like myself are doing it with excellent effectiveness.
Some of the very best demonstrations! Awesome work!
Thank you for the support!
I wouldn't really call this video "demonstrations" as much as pictures and graphs.
Thanks a million John,
I saw one of your videos about speaker isolation a couple of days ago and I decided to test it. Went and bought rubber cushions for my mains and sub woofer. The difference is night and day. Magic 👌🏾👌🏾
I'm constantly researching sound related information and so I'm glad that I found this channel!
Absolutely brilliant!! John - thank you so much for your unrivaled advancement of acoustic education on TH-cam. Bravo!
Thanks!
You described so many concepts so quickly and well thank you.
Studying audio engineering and this chanel is pure gold
Hey man, these are also extremely useful resources for studying the science of sound and recording if you're interested.
th-cam.com/users/geoffgmartinvideos
th-cam.com/channels/N5UUY5P4IO1nCuQSfo-Uug.html
th-cam.com/channels/SCwzZX29jTILlsP4MhjQvg.html
@@murphyalvin1893 thanks bud!
Wow. A video that was actually good info! Props also to testing at NWAA labs, Ron is a valuable source of knowledge!
Best Video I Ever seen on YT . Very well Explained Thanku So Much .
Found your videos recently and I gotta say, I appreciate every single one of them. It's so cool and informative!
This video is actually phenomenal. I learned so much knowledge!
Nice job on creating a brief explanation of a complex subject
I finally understand "bass precision".
Great channel!
The way you teach is very unique
Love love love this video, well put.
I love how when he says 'bass' I imagine the word having an extreme bass boost to it.
A complex topic for sure but this helped me greatly. Thanks!
Graham Hancock is schooling us on audio now too
Great description. Thanks
I just go sit in the corner and wish the whole room was that loud.
😂
Same!
(Fun fact, by the way, if you put a sub in and facing a corner with an obstruction (like cabinets) a few feet above it, the output is greatly increased throughout the room with fewer noticeable modes. It's the same with putting it under a desk or something like that. The modes even out to give more accurate output. Why do I know this? Testing! How does it work? Reverb I guess. I don't know.)
Great videos! Informative and made easy to understand. I'd love to see a video about the acoustics in a round room. I have a such room with a sound system and I'm having a hard time to understand how to manage the acoustics. It seems like the sound bounces in an almost chaotic way to different directions.
It still works in a similar way to a rectangular room at low frequencies, except for the length and width are identical every which way, meaning there is one very strong horizontal room mode right in the centre rather than many weaker ones.
This video is very helpful. I have learned so much. Thank u lots and God bless you Sir
YOU ARE THE BEST, THANKS FROM COLOMBIA.
Exceptional video! But what have "I" learned??? That I am not going to be able to sound treat my living room unless I buy expensive accoustic panels that must be placed by expensive specialists who know what they are doing....Oh well...
I agree. Interesting video but no help whatsoever with setting up my hi fi system and in particular my sub woofers. well its back to good old trial and error for set up.
@@johngarbutt just buy reputable bass traps, the more the better basically
@@johngarbutt I agree guys, there is some nice knowledge in here, but as for me and my setup, this doesn't really do much for me other than to play around with my own testing of acoustical materials and where place them in the room and then for the hours of listening tests as in A to B and back to A....
I think this video is marketing targeted to the very specialists you mention.
@@jasonLJ bassically
2021: Acoustic Engineer consultant Designed my music room w/grand pianos(2) 25x35'. It is not s rectangle but has built up corner absorbers; w/Glass Blocks to absorb 50% Street bus noises. Sound travels 100'/sec
Yeah science experiment with imperial system..
Gotta love laws of physics!
Thanks to you for explaining all these facts.
yoooooooo this is actually insightful. nice work!!!
Thank you so much to be with us ❤️💖
Thank you. I learned something here can use. Plus your product looks good for my very small need.
Thank You this is fantastic video both as knowledge and study.
Real Sounding Video.from massive Efforts..Thank you
Awesome video. Thanks for sharing.
Thanks Graham!
Wow thats some informative stuff. Thanks
Great video! Very informative and easy to understand.
This video is like a bass poetry. ❤️
very informative , thank you
Why wasn't this uploaded when I was treating my room for university studies over 2 months ago hahaha. Thank you though, informative as always.
Beautiful!
Kinda want to take my homemade tube traps to that lab and have a full test day hahaha
I love this so much!
For the love of awesome sound, thank you!
Given all this information. What would be the ideal dimensions for a home recording studio?
brilliant video.
Superb
Absorbing the room effects... Does that also increase the sound pressures in certain areas that were otherwise cancelledbout by a room effect?
I.e. Lower spl at resonance, and higher spl at a null?
You’re an internet hero.
Excellent!
That tube is so cool
awesome video
Love the action man props!
Love this video, thank you
You can use multiple bass systems distributed around the room this allows a more even frequency response.
Please use the metric system. Thanks
Thank you, Sir
amazing video
So these are a broadband membrane absorber ? I thought membrane absorbers only worked in a very narrow band and need to be build to for the room after extensive testing ?
Awesome - I'm sold :D
Awesome content! By chance could you do a video on a round room? Or a Yurt Shape? I am helping a friend build a Yurt recording Studio and struggling to find much information on the general acoustic response of the rooms. Thanks for any help and the great knowledge you've put out! Cheers!
Round is the second worst geometry for a sound room after sphere. It hugely magnifies one or two frequencies beyond repair. I'd advise against it. Thanks, John Calder
This is a great video breaking down the complex topic. I just wish you'd have given credit to the proper name, and credited the discoverer, of the Schroeder frequency.
Brilliant !!.. Thank you Sir !
Do your bass absorbers absorb evenly at all low frequencies or do the target the resonance frequency of the room?
Good explained. Next time turn volume in your record much more up. the annoying sound is not loud enough.
when i look at the room correction results on my avr i can see there is a huge dip in response at around 80hz from a bunch of channels that dip also did not get corrected by the room correction.
is that a room mode problem or a null as the video talked about?
Bass is life.
I can explain: Bass make things go brrrrrrrrrr
Room Null locations:
1st Harmonic Null = 50%
2nd Harmonic Null = 25%, 75%
3rd Harmonic Null = 16.7%, 50%, 83.3%
4th Harmonic Null = 12.5%, 37.5%, 62.5%, 87.5%
5th Harmonic Null = 10%, 30%, 50%, 70%, 90%
6th Harmonic Null = 8.3%, 25%, 41.7%, 58.3%, 75%, 91.7%
7th Harmonic Null = 7.1%, 21.4%, 35.7%, 50%, 64.3%, 78.6%, 92.9%
Thanks for sauce, Sir
Love you sir ❤️❤️
Would sound high intensity create tsunami too? Possible and by superposition freeway and drainage design accurately could be able to generate tsunami from freeway traffic
Thanks for sharing! You're awesome
Nice infomercial! I’ll consider buying two of those if I can afford em.
Some engeneer told a solution to avoid room issues on bass response is to put a line of bass speakers on 3/4 of roomhight....Infinity IRS applied this with their 6 x 12" bass speakers ....?!
fantanstic music science
When you say velocity based absorbers (fiberglass and rockwool) aren't effective under 200, do you mean not effective at the same depth as pressure based absorbers or do you mean its inefficient use of the space in the room due to the depth you need for them to make a difference, or porous absorbers cant do under 200 hz even if they are a meter deep?
Thanks for your question, Casper - It's a good one. Fiber-based absorbers (and obviously foam) are ineffective compared to the relatively small size of membrane absorbers; fiber is also less efficient under 200Hz than membrane absorbers; and fiber must be placed in the additive mode points (the anti-node) to be somewhat more effective, which is usually in the useful space in a room.
The "original bass traps" were designed by Tom Hidley to be used in high-end recording studios . They were about an additional 1/4 the size of the control room space (my estimate) and were an entire small room filled with fiberglass (lining the walls and covering a large number of "blades" hanging from the ceiling, with a slot-type "port" opening). These were effective, but obviously used a huge amount of expensive real estate. Properly designed membrane-based low-frequency absorbers (I really don't like the term "bass traps") are more efficient, are best used at boundary surfaces (thereby out of the way without using valuable room space), and end up being cost-effective.
I’m only here because when I bend over next to my oven while my speakers are in the living room, I can feel the bass in my chest
Finally getting somewhere maybe which is actually hard bc every info source on this arena is biased toward their own products.
That why i love my concrete room as it makes a small bluetooth speaker into a large sounding subwoofer
helpful
at 0:45 the 6' tube resonance = 188 Hz
at 1:46 there is a sweep from 188 Hz and down to 94 Hz
The narrator says that below the modal range (188 Hz) bass can't fully develop while the video is very clear what happens. There is plenty of energy in the whole tube at 94 Hz at 1:52!
Bass very obviously develops without any issue below the modal range. -There's plenty of bass inside a loudspeaker box. -We can hear the whole frequency range with earbuds, even if the modal range of the ear canal is at about 15kHz.
1:57 "the room crossover". This is the "transition range" (Schroeder frequency) and it indicates the area where the room transitions from Ray-based acoustics to the modal range where the sound is dictated by the room dimension. It is not "velocity based to pressure based" sound behavior.
The pressure range is below the lowest mode of the room (the longest dimension of the room).
Maybe what the narrator wants to say is that most typically, but certainly not all the time, it is beneficial to use pressure-based absorbers in the modal range. ...at least with regards to how much space the bass trap occupies.
"Only accurately tested & lab-proven bass absorbers are known to work"
That is a very strange statement. A Helmholtz resonator doesn't need to be tested for it to work. Just blow across the neck of a bottle... it works. Further: there's a reason why Sabine's numbers are just above 125 Hz (sometimes 63 Hz) and that is because, as the narrator said earlier in the video if a pressure-based absorber is placed in the wrong location, it has zero effect.
Hi Lars, thanks for your comments. When trying to explain complex topics simply, it becomes necessary to under-explain deeper parts of the topic; the goal of our video isn't a PhD. level course in room acoustics, it is an awareness that there is a lot going on at low frequencies in a room and that with some knowledge, reasonable choices can be made to improve one's listening space.
The point of the Kundt's Tube demonstration in the video is that below the resonant frequency of that particular dimension, the wavelengths are too long to fully develop and as a result, the usual methods of absorbing sound to reduce resonance energy, which are wavelength-dependent, are far less effective. Of course there is energy in the room from the speaker or instrument - the point is that to control resonances, different methods must be used.
Many research resources use the terminology "velocity-based" and "pressure-based" - I decided to go with those terms. Yes - there are other LF absorber choices, but they all use much more space and can be unpredictable unless fully tested in an acoustics lab accurate down to the target frequencies.
As for Helmholtz resonators, I have two problems with them: 1) as air conditions (temperature and humidity) in a room change, so too will the resonant frequencies (speed of sound varies by temp...) - will the Helmholtz resonator track those changes linearly? 2) More importantly, why would anyone add a new resonance to an existing resonance? Sound transients will be destructively affected.
Well-designed and accurately-tested membrane low-frequency absorbers work, and if properly placed, remain the best choice to mitigate room modes, IMHO. There's a lot of misinformation and bad or non-existent "bass trap" specifications in the marketplace; there are test results from laboratories that cannot be accurate below 150-200 Hz due to Schroeder frequency test room size limitations. I'm confident that more information, even if condensed into short videos like this one, is helpful in making purchasing decisions, whether for our products or for other manufacturers. I wish the industry would get its' act together and insist on accurate product testing and specifications for these areas.
Thanks again for your insightful comments!
John
Good selling skills-- I'm totally ready to buy me a nice set of bass traps, even though I only use headphones. ;-)
Graham Hancock sure does know his geometry
lol
Hi ....is the soft copy/digital copy of the book MODERN ROOM ACOUSTICS is available yet ??
Figuring out bass at NWA labs? I'm down with that. Can they measure out my six-fo?
While NWA did have some awesome bass, NWAA Labs in Elma, Washington is the best place to test bass absorbers and other acoustical products. 'Prolly can't do the six-fo tho. Maybe could measure the car's engine sound...
Great information and demonstration. But for a speaker system, a subwoofer array is always going to be the best solution to getting rid of room modes below 100Hz.
Multiple subwoofers placed optimally in a room are better than a single sub, but the room will affect the sound at low frequencies regardless of where and how many are in the room. Adding subs and "room EQ" will not remove resonances or the fact that below room crossover, wavelengths become pressure-based. Properly treating a room for low-frequency modes and then adding subwoofers is advised. Laws of physics...
Nope
@@johncalder8490 Room treatment is not the foundation for having great bass, but more like the cherry on top.
Subwoofers and their proper placement and integration and subsequently room correction will get you to elite levels of bass performance.
The frequency response dominates our perception of bass performance. Below 100Hz, subwoofers are required to fill in the nulls. And with 2 subs you can have null free bass in many rooms. Couple that with a good room correction like DIRAC and you have bass performance that is damn near perfect in the frequency domain and very good in the time domain.
Can room treatment help improve things further? Sure, but all the leg work has already been done.
And room treatment is so damn expensive that it becomes more cost effective to just buy more subs.
This was great
Nice.
aren’t membrane traps more targeted for a narrow freq range?
Cool video! I wonder if you can talk about some design solutions to these bass problems. Like, what would be the ideally dimensioned room for accurate bass? Or what about a room with no parallel walls? Would that make it easier to achieve accurate bass? Could the walls be fitted with textured shapes that disperse sound, or would it be better to just have them angled away from each other, or maybe both?
To answer that, you have to know ahead of time where the speakers and subs will be placed before the room dimensions can be optimized. See Floyd Toole.
Thanks for your questions! Designing a room without parallel walls and non-parallel floor-ceiling geometry is a great partial solution, and many recording studios and high-end listening rooms do just that. But volume-based low frequency resonances (the same effect as blowing across the top of an empty bottle) will continue to be a problem. Also, due to room crossover, there are no diffusion treatments that will diffuse wavelengths longer than the room dimensions. The best solution to room modes and bass resonances will include combining effective low frequency absorbers with optimal room geometry design (as well as optimizing speaker placements).
@@johncalder8490 Thanks for the answer. Is there a program you use to determine optimal speaker placement and absorber placement in a given room? Also does room crossover cease to be a problem if your room is large enough to contain any anticipated bass wavelengths?
Nice done lads
Awesome
How can i calculate L shape room mode?
Now this is an explanation!