5:19 there is an opening in that upper corner, won't that effect it badly? lol cuz that corner's exposed?

So the sub should be slightly closer to your chair along the floor than the speaker stands. If you were to imagine a fixed-length rod going from your ear to the woofer of your speaker, and you then move then end opposite your ear down to floor level where a sub would be, that point would be closer to your chair, but all drivers would be along an equidistant sphere from your ears. Correct?

Aweee man. Please go into the dip you mentioned towards the end of the video pertaining to the size of the trap and Airgap.

I have panels on my side walls, and front wall (behind speakers), when I clap I can hear the zing and it’s really frustrating. I can hear it prominently in the listening spot and also if I clap closer to the floor I can hear the zing. Will installing carpet possibly help remove this ?

you talk too much, get to the point!

I can relate to so many this he’s dealing with. I also make jungle in Ableton, I also work in headphones way more than I would like because of standing waves in my room. I also listen to my tunes on in-ears on the metro on the way to work and use the notes app to make notes about what needs fixing. Now I will make panels for my room and hopefully work on speakers more. I can’t wait! Thanks for this Jesco, it was really reassuring to know there are people going through the exact same issues as me!

I bought some higher quality 1” foam (should have bought 2”) but I’m gluing to 3/8” plywood so I can move, reposition or remove them. I was going to space off the wall around 1”, but since the souldwaves will not pass any deeper in the foam before it bounces off the plywood, I won’t get anything from spacing off the wall. Correct? My only thought is some sound waves bouncing behind then bouncing between the wall and plywood backer. Any truth to that? My studio base for guitar with Marshall amplifiers is 12x 8 with 8’ ceiling. My space is small. Carpeted floor.

my current speakers go down to 32 hz. i'm thinking of adding a sub to go down to 22hz. will it be worth it? i'm not sure if that will improve a lot in the bass area?

The link does not work. Please don't enter your email address and be disappointed. However the content in the video is good and informative.

Mine is 6 x 6.

Hi Jesco. Could I get your advice on a concern I have? Feeling a bit lost for help... I just received 10 acoustic panels (2x4x3) for my home studio(just for mixing) and on closer inspection, I see that the fabric used to house the rockwool is 10oz canvas duck fabric. When I try to blow through it, it is very resistant to air passing through. From my research, this could be an issue with high end absorption as the sound waves will reflect too easily due to the tight fabric. At the risk of spending over 500$ to re-wrap them with a more porous material, I thought I'd ask your opinion as to wether you think that would be worth it or not. Based on your experience, do you believe the difference would be significant enough to embark on this tiresome project? Thanks

Fantastic video mate. Do u have a video that talks about how to treat the wall behind your studio monitors?

For me as an aspiring soundengineer, this video was so helpful. Thank you so much for this clearification. Are you from Germany? Your accent sounds familiar😅

hello, at 10mn, you speak about absorber and compare a 6000 pa.s/m2 vs a 30000 pa.s/m2 but 6000 is 5x more efficient than 30000...it's reversed.

Flipping the phase of my sub fixed nulls for me and helped flatten the curve, I had a serious null at 86hz which. Totally fixed by adding a sub and flipping the phase 180⁰

"if that's all you have, try it...see what happens" THANKS LMFAO

From my experience, there is always a “break even” point, and at the moment, that is not €3000 or €60,000. For a very satisfying digital system, this system is around €15,000. Above that, big money don’t produce much better sound.

You forgot to tell us how to make, and what materials to us for making porous absorbers, what is good, what is not. What size should the be etc. Nor any guidance on how to determine a better listening position. I am trying to learn, but somewhat disappointed.

Question: Would single bat of insultation, like the one in this video, make a meaningful difference on controlling bass (under 180 hz) in a cluttered smallish room (12.8ftL*11ftW*8ftH)? I've already got 4 16in*49in absorbing panels in it, which have made a meaningful difference above?

"nunya bizfam" - None ya biz fam 🤣

These acoustic sound dampening carpets are quite expensive, and you saved me a lot of money! THANKS 💗

could you not afford a tripod or is it some demented ai auto subject focus, either way it's distracting brotha!!

Jesco, which frequency range your design diffuses?

Hi, I’ve taken acoustic measurements in my room and noticed a spot, about halfway across the room, where the low-frequency decay drops significantly, and the frequency response extends much deeper. Do you think it would be a good idea to move the listening position there?

Build a panel deeper with air gap without porous absorption,,, it will become bass absorber???

I am fairly new to all of this but have done a fair amount of research and my question here is... I've read that if you put absorbent material (insulation) in a Helmsholtz Resonator chamber, will it add a little more to the frequency range (aka, broadband width or Q). Is there and validity to this? Please advise.

Lots of people sounding off on their tube trap theories. Here's mine. Because of the complex shape the absolute thickness of the porous material is constantly different In some places, depending on the diameter of the tube trap, the sound is traveling through more than just 2x the wall thickness. What ends up happening is a sound wave travels through air and into the tube trap where it encounters the resistance of the fiberglass in a non-linear way because of the cylinder shape. As energy travels through the tube trap, the constantly variable thickness of the the absorption combined with the constantly varying times of arrival because of the cylinder shape has a way of decimating the energy. Someone like aerating water through a screen. If it was just a 4 inch panel of rigid fiberglass covering the entire wall, the sounds would arrive at the first resistance at more or less the same time depending on the angle of incidence for the source and continue through, impeded linearly by the panels and then reflecting off the boundary surface. It would just be a uniform attenuation without any sort of disruption of the coherency of the wave. I was absolutely not a tube person until I started watching EVs videos. Now I think there is something unique. Also, he tried stuffing them to make them solid tubes of fiberglass and found no meaningful difference.

How irresponsible is it to give a recommendation for something that may carry long-term risks without clear evidence or studies?

Treating an empty room sucks. Adding furniture in a living room (couch) in front of sub and blocking first reflections helps a lot. My Ethan Allen is made with high density foam, batting and breathable fabric and works great. A huge wool carpet will also help. This got me down to an average of 200 ms but I do have a problem with .5 seconds at 20, and 30 hz. I was going to tackle with 2lb mass loaded vinyl membrane boxes. I also want to try Sonopan in absorbing panels with fiberglass.

Did he use scatter plates in all use monster base traps or just that one in the back corner?

Without all the voodoo? :(

Just found this. Audiophiles are people…and are all people the same? No. Some are obsessed with looks, some prestige, some status, some utility and a mix of all. Music preferences are the same. I guess what I’m saying is you’re never going to 100% satisfy all so do what you think is best the best way you can😊

Its so counterintuitive, you figure if the air cant get stuck in it, it does nothing

You mentioned before that it's best to do broadband absorbtion before pressure absorbers, but what if you don't plan on bassically covering your entire room because of practical reasons, then would it make sense to only use pressure absorbers to take care of low end issues?

Does anyone know how to get low density insulation in the UK? The commonly available product is Flexi / Sound Insulation Slab - 35kg/m³ - 14200(pa.s/m²) and RWA45 - 18100(pa.s/m²) which is way off the 5000 or 6000 pa.s/m2 I wanted (customer support gave me these values.

a lot of guys have this 'annoying resonance.' its called a wife!!!!

Hi Jesco, thanks for the wisdom! One question I had that might be interesting for future knowledge bombardments: If I have nailed down my speaker position (close to the wall in my case) using some pretty standard stands, would it be workable to make some sturdy DIY wall mount fixtures for them out of wood? Basically a wooden platform for the monitors with some vibrational damping. Could this be a bad idea regarding vibrations? Thanks in advance, even if you don't pick this question :)

Research consistently shows that sound absorption in materials like fiberglass relies on airflow through the material, as sound energy is dissipated primarily through friction with fibers. Wrapping in airtight plastic, which limits this airflow, can reduce absorption performance by as much as 20-50% in mid to high frequencies, depending on thickness and type. For more details, acoustic research databases or journals like JASA (Journal of the Acoustical Society of America) would be valuable resources Key sources include: 1. “Acoustical Materials: Solving the Effect of Barriers on Absorption Performance” - This study from the Journal of Sound and Vibration examines how barriers impact absorption in fibrous materials. It confirms that airtight barriers like plastic significantly reduce absorption, especially in mid to high frequencies, by limiting sound wave penetration. 2. “Sound Absorption Coefficients of Porous Materials” - This paper from the Journal of the Acoustical Society of America explores how materials like fiberglass absorb sound and how air permeability influences their performance. It shows that restricting airflow, such as with plastic sheeting, impedes sound dissipation, especially at higher frequencies. 3. ISO Standard 10534-2 (Measurement of Sound Absorption in a Reverberation Room) - While not a study, this standard is often used in studies to measure sound absorption. Several tests using this standard demonstrate that materials lose effectiveness when covered in impermeable layers

Glass wool and mineral wool can pose a health risk if fibers are inhaled. To use them safely in bass traps or acoustic panels, they should be fully encapsulated. Alternatively, lung-safe materials are a recommended choice for both convenience and health

guys I think you are overthinking this subject... Its much simpler IMO, more expensive good speakers usually have better materials which result in better looks, lower distortion, lower bass and higher SPL capabilities. Now, regarding sound character, you can have neutral speakers that are really transparent to the source material with good off-axis performance and smooth directivity, that is objectively shown in the spinorama data. no doubt about it, its physics. Why wouldn't you want speakers that are transparent to the music? if you dont like how the source material sounds then just use tone controls or EQ to make as you like. Why all this philosophical discussions??:)

I am watching with pleasure your channel, hoping that one day I will undersand something out of it. I am not a profesional audio anything, just a music loving person. Does anything on your channel apply a person that is just listening to music, a person with decent reproduction gear, with a very bad listening room? I don't understand most of the technical terms I hear. :)

Great stuff, but there were too many interruptions during some of the discussions.

There are acute effects and chronic effects: chronic are long term. Mom had respiratory issues caused by exposure to laundering dad’s clothing which had fibers for about 3 years. The long Term Effects happened about 25-30 years later they can include: Chronic bronchitis Reduced lung function Lung tissue scarring Respiratory diseases like interstitial pneumonia, pulmonary fibrosis, and lung cancer Look it up yourself. N95 filtration would be a good idea inside the box surrounded by the acoustic material protect yourself from fiberglass.

this video was pure voodoo lol. you literally didn't answer the question of the title. some good advise tho! I've been enjoying the channel a lot

VPR's - if you use thicker steel instead (2mm), you'll get much lower absorption apparently.

Angeled sealing, yeah i got it 😂. Wall behind speakers about 130 cm high, angeled sealing up to 222 cm, flat sealing 120 cm and angeled sealing down to 140cm. Length between front and rear walls 440 cm, 400cm wide. Can it be worse?😂😂

Which editor do you use? Studio sound sounds ok

I always used to place my speakers at the room 5th and listener at the room 3rd in a small room Lol Now I'm wondering where I ever got that idea after revisiting these concepts 😆😆 In a small room this usually leaves you with a wonky layout with a lot of waste. 😅 Most important if speakers on the back wall is listening at a 3rd or 5th and staying away from that dead zone in the middle. Real good point about the imaging though 👍

I have one question: The bass hunter technique says, place your speaker in the corner, after finding the right spot re-place them. Doesn't that mean that you "move" the peak and nulls of the standing wave again after replacing the speakers, thus leading to a new situation (shifted peaks and nulls of the room modes)?

I am going to install BOSE Free Space FS2SE, My room size is 20feet / 40 feet. As per BOSE manual first speaker should be place at ½ LSD from any corner of the room and Continue to place loudspeakers along the wall at LSD. Supported room width can be up to 2× LSD. How do i calculate LSD as per my room size ? Thanks