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This is such great advice. Thank you for this video.

Thank you, mr. Lenz. Thank you, mr. Brandt. Greetings from the Netherlands.

and what are anechoic chambers made out of? what is NRC and how and why was it developed? Complete misinformation and lack of understanding of basic physics not even knowing how sound absorption works. if rockwool didn't work then bass traps wouldn't exist and neither would recording studios or anechoic chambers.

This was just absolutely amazing! Thank you Karthick, Marzban, Ron & John for doing this!

8:40 hey John, could you elaborate on that matter? the multiplication of the schroeder frequency by the √2.. what is that frequency tells us? We want to avoid resonances specifically below that frequency, but why this frequency and not above?

Wow, Was Ron saying that air-gaps for absorbers aren't necessary?

I’ve been doing this for 40 years and the challenge of HVAC always is intimidating & evolving. But like your short answer: “turn it off” between 30 minute sessions. Then crank it up or down for the break. Iv’e tried mini splits, tapered and baffled ducts, individual room self contained and on and on. It inevitably comes back to “turn it off”.

Has any research been undertaken, investigating textile composite fiber blends (dare I say it), for example two layered composite fiber with a concentration of carbon on the forward dimension with wool woven on the reverse side. Published data shows significant bass absorption to 40hz in low freq. and significant rejection of high mid, high and transient frequencies?

@JHBrandt for a room of that size (and with the PMC monitors specifically) would you consider soft flush mounting them? PMC claims that their monitors have ultra-wide dispersion so the sweetspot area is larger, plus they have their ATL bass-loading technology -- well, they make some nice claims all around: extended accurate bass even at low volume, etc. I have the newer version of those monitors, the result6 (in a similar sized small room) hence why I'm so curious if flush-mounting was considered at all for this project or not, and if it was considered what made you go with free standing speakers in the end? Also, could you explain what's behind the prime 17 primitive root open back diffraction panels? Is it possible to place the limp bag traps with an absorption layer inbetween behind these pass-through diffraction panels, to treat different frequency ranges and achieve a more open space sound in a small room, all at once? Do you still use other types of membrane traps (perhaps targeting a more specific bass frequency) in a room with the limp bag traps as part of the design, or generally there should be no need for this? Thank you so much! Love your work.

In lieu of a poured concrete slab have you ever encountered the use of “tile” like patio paving bricks to create increase🎉mass

Hey John. Where do vents go? Can we put ventilation baffles inside the wall cavities? Like in-between a double wall system? I will end up with a 3 foot space between ceiling and roof and I want to use this space for air transfer while isolating sound as much as possible. Bad idea?

Thanks so much for all the great content John. Invaluable resource here! Quick question for you, I'm trying to find the Owens Corning Pink 8" material you are speaking of. I am in the US so that should be easy but I can't track it down but I can’t locate it. Is there another name for this perhaps? Do you possibly have a link?

In a 2x4 double stud system I'm not filling the bay completely. I just want it in against one side. Do recommend faced or un-faced insulation in this application? Seems like faced won't sag..

WOW.. so how would you hang second layer of dry wall? Just glue or double sided tap?

Listening to you guys talk through various challenges and solutions was very informative, as I continue to build out my home theater acoustic treatments. Upon doing my research, I'd actually been really curious about the seemingly prominent use of space couplers over studio desks, which you addressed as creating a diffractive cloud that helps to mask studio desk reflections. That was invaluable, so thanks for that! I'm curious why space couplers don't seem to be used as much in home theater applications over seating areas, ottomans, etc. Any thoughts on that? Thanks again!

Learnt about Ron Sauro yesterday, he certainly has a few stories to tell 😮

Awesome content!! Liked, subscribed and now binge watching to catch up. I'd be extremely interested to hear your and Ron's opinion on Acoustic Fields diaphragmatic absorber with their carbon technology, they claim to absorb down to 30hz and even lower if you go thicker. Do either of you have experience with them? I just looked into Real Acoustix and saw they are next door to me in Ogden Utah, I live in Logan, so that's awesome.

Is there a part two ? Thanks!

I have been told that Mineral wool attenuates lower frequencies better than the equivalent amount of fiberglass, but I cannot find any data on this. Fiberglass is measured in wall cavities (STC) and mineral wool is measured alone? (NRC). Do yuo any experience with this claim? I am considering mineral wool for in ceiling/wall in a home theater.

WOW WOW WOW, man.....this sessions are insanely vigorizing. It just makes you want to dig it more and more. Keep it comming please. For the ones like me that don't have anyone to discuss this kind of stuff it's life saving. Thanks to all of you, each one of you looks so commited to share information that is so difficult to get FOR FREE that it blows my mind. Really thank you so much for the time you have give us!!!!!!!!! Greetings from Uruguay!

Boy, I tried every ratio option for my 8' ceilings, but I couldn't get anything less than .29 seconds RT60. Any suggestions John?

Hi John, Thank you for these videos. You mention painting a concrete wall to seal it. What kind of paint do you recommend?

Thanks @jhbrandt You mentioned that very high quality carpet padding reduces footfall well. Is there a brand you recommend?

Dear John, I am using a mac and I can't transfer the data change with the command control+shift+S(on mac this is Save as...), is there anyway I can do this from menu commands? sorry to ask, the chart is not functional otherwise

I have a second story timber house and I'm finishing the 2nd floor attic band rehearsal/live room. For DIY, seems like the more affordable option is just to add some gypsum and two 3/4 OSB laters to the floor, maybe some gym mat in between. Am I wrong? This could be done for $1,500 as opposed to hiring a $3,000 consultant, a $3,000 structural engineer to tell me that I can't pour a slab up there. Assuming I can't do a slab, are there many other options? The rubber U-float sounds like a problem waiting to happen (additional resonance). If I take the cheap DIY, my wife may still be able to hear my band rehearsing but ultimately I don't want her to hear my acoustic guitar practice late at night. If I have the money down the road, and my DIY floor is a failure, I could pull up the plywood/gyp/osb floor and consult someone.... appreciate any advice!

"You can put a sh***y speaker in this room and it sounds good." This is one phenomena that people really need to hear to understand. I have a small decently DIY treated listening room / synth den and it's a fun experiment to show to people who say "You have good speakers": Switch speakers off and listen through a beverage can sized bluetooth speaker, a kitchen radio, heck even laptop speakers sound surprisingly good, considering what they are.

Unfortunately URSA SF38 is not 38kg/m3. It has nominal value of thermal conductivity λD = 0.038 W/mK, and the density probably below 20kg/m3. There are some products that should be better- Knauf unifit 032 - 34kg/m3, λD = 0.032 W/mK , Isover multimax 30 - 40kg/m3, λD = 0.030 W/mK. I would look for λD <= 0.032 W/mK, as its density should be around 30+kg/m3. Rockwool usually has higher λD for the same density compared to glasswool.

Great resource for Europeans 😊🇪🇺 Greetings from Poland 🇵🇱

NathanOakley1980 reviewed your video - worth a watch.

Hey fellas 3 or4 grown men that think the earth is flat are about to enter your comments, just ignore and block them. 👍

Live your channel, and your info. I’ll be covering this on my show tomorrow, I really hope some people come your way for the right reason. They will let you know I sent them.

7:22 umm, gravity hasn’t been a force to “stop you floating away” for 108 years, “Gravity is not a force.......but.....YOU CAN *think* of it as a force” George Musser 2019 ... the height of double speak. “gravity is not a force” George Musser 2019. Gravity is the bending of a conceptual meduim known as “space time”. You can’t bend concepts, and thinking about it will never give rise to any force. “There isn’t really a force of gravity at all” Professor Brian Cox The “legislators” still need the idea of gravity to be prevalent among the people. Gas behaviour, described by the second law of thermodynamics defies this out of date “theory” (it isn’t that either). Gas expands in all directions and is not effected by pseudo-geometry of Einstein’s 4d space time bending. Audio is 10 years behind, pseudo physics (taught by consensus and *not* “science”) is 108 years behind. Einstein superseded Newtonian *forces* holding us to a ball quite some time ago, doesn’t it blow your mind 😆

4:30 never has a more true statement been uttered!

i dont get whats the big problem to get data reg the VPR`s? its just the polyester stuff + cold rolled steel plates. put the stuff in rons lab and voila.

Ok.... why did 2 of my comments get deleted here ? Is this normal on this channel if you challenge the narrative ?

He is talking about pressure but porous absorbers work with velocity

I’ve seen his mug on multiple forums saying nothing works. Cmon dude

Total IDIOT ...................... ALERT !!!

FOOL, ... Exteriour Rockwool and plasterboard STOP REALLY LOUD NOISE...... This is a Fact, you are daft.

.......... and you ARE, A LIAR ! 100% YOU ARE AN IDIOT, YOU KNOW NOTHING FOOL, NOTHING !

Dude, YOU are talking shite. YOU sir, are A Fool !

😎

John helped me design a home studio that is amazing and was really an amazing experience.

Promo sm 🤩

At first it looks like a nice presentation with graphs which is rare. At the second look not very much. Firstly you don't have Schroeder frequency at 41 Hz in your lab but rather at least at 282 Hz. To reach 41 Hz Schoerder you would have to have 0,12 s RT60 with 210 Sabins in the room. Therefore there would be no diffuse field, nor could you measure adding 20 more Sabins into the room accurately. The ISO norm states for 281m3 you can have 8,15 Sabins in an emty room at maximum. So the basics are wrong. The vast differences when reasonators placed in different positions furthermore support the basics beeing wrong. Not sure how customer relevant tilting the panels is, when nobody uses it this way. Measurements shown are not valid for other rooms, since the effect will be very different according to room size and placement. Graphs should not be called Sabins at all. There can be a discussion of how to measure it and I support it and will gladly contribute to it. But this seeems to be presented as a breakthrough which is not. Only the placement is optimised for highest absorption on graph not real world usage. I have actually seen this type of measurements done many times by other companies, as a over the line marketing. Once you step out of the rules you have to be very carefull how you define things. I do not think this is transferable to other rooms. So you will not be able to do accurate calculations with this measurements. Please take this note as a constructive criticism, I know it is sensitive and difficult topic. I am beeing honest here as an engineer to an engineer.

Great info. I have always placed my 2" thick absorptions panels against the walls. These are my 1st, 2nd refection absorption panels. I have a cloud which does have an air gap about 2-4" off the ceiling. I have a thin carpet in the back of the room to help with some of the reflection off the floor to ceiling. I also have bass traps in all 4 corners. the final panel i have is a 4x8 panel with 4" thick rockwool. this seems to all work pretty good. I am not an expert I just listen and decide if I like it.

That’s how the off the shelf GIK panels are designed. They have a 1” enclosed air gap behind the absorption.

Interesting video. I started writing this here but I'll email this to you instead but I thought I'd leave this up for anyone else interested...I'm interested in more info about the sound absorption that you mentioned at the 24:44 mark, absorbing 80-500Hz. I have a GretchKen booth that's 6x4 and I've noticed some low frequency reflection. I currently have the booth covered with Rockwool Safe & Sound and some cotton fabric covering that. The one exception is the roof, I haven't gotten to that yet. The booth was used when I bought and the original sound foam was deteriorating and after reading other VO talent using Rockwool I decided to use it. I think if I can just eliminate or at least reduce the low freq reflection I'd be happy.

How do Peter's results sound to you John? Also would be v interested to hear actual recordings from Peter's room. Also did Peter do any before/after measurements? Exciting times ;)

What is a waveguide? Is it a perforated panel on top?