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Thank you very much for the video. Can you put the link to the articles you comment on by Dr John Davies from Australia? "I have already seen that they are his works" but he signs them to make all that knowledge known. Written with a translator. Greetings

I am sub to you!

Good sir.. i cannot find the MEM calculator to download.. 😢

two Primacoustic Maxtraps in corner? or 2 fulltrap against the wall woud be better instead?

This in an incredible resource - thank you for your generosity. To your point on trapping the fundamental frequency and the harmonics are also taken care of, does that also apply if the walls are of sufficiently low mass (drywall etc) to let the fundamental pass through? In that case do the harmonics of that frequency also not show up, or is that a different phenomemon? Thanks :)

This concept clicked for me with this video; thank you!

what does resonance mean in the topic of soundproofing?

John has spent a lifetime in search of acoustical truth. I have been a client of his for years. He’s a great value and true to his word. Ron Sauro has the only lab capable of proving and testing different materials & technics. In my opinion most other claims by other self proclaimed experts are false and misleading. This should provide you with real data with real testing behind it that you can rely on. I’m going to do this. Recommend it to others

There is a band below my rehearsal space that is extremely loud. Would a floating floor help to reduce the noise that comes up to my room?

I love music and love mathematics so much. Don’t have phd in it but love acoustics and how everything mathematically related to each other.

Hey mr. John, at 4:07 I think you were referring to the distance between two modes where room has no resonance to support certain frequency but mr. Ron,if I am not mistaken, was referring to the pressure zone below the lowest frequency that the room can support. Or am I wrong? Ty for your educational videos.

Monthly subscription is great! I can afford it! I know reach teachers they work in Russian MGU University. Hey, Ron - you can teach me, i’d love to become a scientist in this field.

John did a great job showing how horn works😂 could be a great flight attendant 😂

Testing a particular product in a strict way on a “lab” doesnt mean that those tests will reflect on a home or project studio! Home studios are not testing labs and results will differ from room to room! So imo acoustic science is one of those siences where maths in paper fails to translate in rear world! It can come close but not accurate ! Thats why acusticians change their mind every so often!

Thanks souch for posting this meeting as a video - they draw me in to wanting to know more (I did study physics at degree level - long since forgotten). I'm looking forward to the course !

Perhaps a daft question ... But how well would clutter on a back wall absorb bass frequencies? I'm thinking of industrial shelving with gear loosely stacked etc .. Maybe a free edge-effect absorber for folks with little room ( and not looking to make it attractive for clients)..

That covered some interesting ground, particularly with phase. Monkeys in a forest.

Spaces between absorbers absolutely do cause reflections if the angle of incidences is ~0 degrees. In larger rooms is less obvious since the path lengths of the reflections are longer so by the time the reflection reaches the opposite surface it is already attenuated and spread out, but in smaller rooms this is not the case. I have tried this many times, for example a control room with two doors opposite each other with treatment both sides of both doors - you do not get reflections off axis but if you were to talk or clap directly between the two doors you will get a very obvious and strong flutter. Therefore the doors do not "disappear" or "extend the absorption" in that instance. It's not an issue for the sound coming from the speakers due to the angle of incidence, but directly between two opposing reflective surfaces you will absolutely still get reflections.

i just measured my living room at 8ft

So when talking about time, I assume this means having all the sound arrive at the same time, or at least controlling reflections enough so that the loudest sound arrives first without too much decay?

Hey - great video - One of the few that seem to get it right. I'm trying to soundproof a rather small room at the moment for playing multiple instruments. The main goal is to have it as quiet as possible to the outside / neighbours - Actual sound treatment / how it sounds on the inside would be secondary. I hope it's okay to ask - What material combination would you recommend if the "sound proofing layer" for the walls could be 7-8 inches thick? Thicker would be better of course, but that's unfortunately about as thick as it could get. I'm still figuring a lot of this out - Especially after watching your video! It seems like SCT rating isn't the only thing to consider. Thank you a lot!!

I have found one more fiberglass product -Isover stropmax "37kg/m3"

Why are you asking that meatwad about acoustics?

This is a treasure! So much bulshit is online these days. This is a real science, based on measurements. Not on assumptions from wrongly based calculators. You guys are going to change the industry.

❤

So glad u got ur smile back ❤

He's back!!!

I would say, that so much stress put on the reverberation room measurements is also a bit of misconception. If you want to compare materials, do it with the same standardized method, indeed. If you want to universaly capture boundary condition for room acoustic designs, do it in the reverberation room, indeed. If you want to sell a product, have it measured there, because it is a commonly understood quantity, which is decently robust. On the other hand, in small rooms (which is the most common case for DIY projects), the transition to modal field is rather high, often higher than 250 Hz. The field stops to be comparable to the one of your measured data under that frequency threshold, no matter how big and great the reverberation room is. Even at higher frequencies, is the incidence of sound really random enough to be considered precisely reflected by the reverberation room measurement? Sure, questions like "Is 10cm of this and that material sufficient for the room treatment?" make little sence, but at the same time, it is fair to say, that random incidence assumption has also its limits. That is why the room acoustic treatment is typically done in phases, measuring the results after each step and calibrating the model, if there is some. DIY solutions need to be driven by well informed decisions and with realistic expectations, but small rooms are kind of ideal for tinkering with different solutions, measuring incremental steps. There is already a lot of (scientific) literature available which makes the tinkering converge to a decent solution.

Thank you for the reminder John! I hope you keep educating :)

John, didn't even know you had a RUclips Channel! Happy to have found it, thanks for the video.

hey John. Good to see you on the vids again. Did you say you were going to post a link to the course? Can't see it

Hey John! Always a pleasure to see a new video of yours! Watchout for your phone, at the beginning there is some interference going on :)!

"Fiber can only work efficiently down to 70hz, no matter how thick" How much efficiency loss are we talking? Cant you absorb 50hz even if you have 2 meters depth?

@JHBrandt do you have any updates on the bluejay acoustics PET material?

With all due respect, you continue to make points in a sense that only you have all the relevant data without actually posting the data. This is in a sense an empty argument. Null.

The best most can do to improve their small room setup is to tame reflections and excessive reverberation in their space. In 1980, the annual median income was 1/4 the price of the median home price. It is now 1/9 of the median home price and rent price. DIY is generally done out of necessity, but is not the first or most accurate choice for most. It's best to adopt the most scientific approach possible yet one must also be empathetic towards why the DIY approach is so common. If one needs to stretch a dollar, they will generally sacrifice some quality along the way to achieve it. It's all a reflection of the world around us. Thanks John

Thank you John for sharing! Very happy to see your videos. :)

Or your idea gets falsified when your experimental treatments are in place and you've got a big hole at 77hz right at the listening position...

Missing your content John! Glad you're back!!

The best of the best. One day I hope to work with you.

idiocracy perfectly describes what is goin on in the world now

Guys i’m so interested into tour course! Science is the GOD. Sad people don’t understand it.

Governments rely on laws they make to hold people from very fast development.

This is a treasure, gentlemens!

Oh this is exactly what i’m going through right now. People see plans and freak out.

54:30 i need that book! Please give it to me. Publish it!

What was the overall size of this room and why so many diffusers versus absorption if it's a small room

What insulation do you recommend for in-wall speakers? Want to fill the wall so I don't get too much resonance on the adjacent wall, I also want to minimise vibrations. Thinking of deadening the inside of the wall with some dynamat, but wanting to know what else would help. Thanks in advance!

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

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