Aah...such a relief to hear someone who knows what they're talking about. Great content.

That one negative vote is from Dennis Foley.. :P

I am so glad I found your channel before room treatment. I don't see this in-depth info elsewhere and learn something new every video. Small room home studio here, porous traps here I come.

Thank you for sharing your time and knowledge with us. Your presentation is clear and precise. Just what the audio doctor ordered. Keep up the great work!

keep up the good work man! I really appreciate it!

basstrap guide is awesome!!! thank you!

Wow , this was great. I am a subscriber now and finally my work towards soundnirvana is getting closer I think. Thank you sir. Just ordered 8 X 20cm deep rockwool insulation .. as a start.

Great to have it explained properly ....I downloaded your guide....thanks

Thank you so much for this clarification. That will save me so much headache and money , I was almost about to get into membrane traps🤦🏽‍♂️

Thank you so much for this super helpful video!

Great video dude!! The bass trap guide is incredible -- you are gonna help a lot of people!

great great work!! as usual..

Jesco! Can you tell us straight up: are Dennis Foley’s diaphragmatic absorbers voodoo? Please do a whole video with your thoughts on Acoustic Fields, we need that video badly!

This is really interesting. I'm so glad I've discovered your channel! Do you plan on doing a video about how to treat very low frequencies using velocity traps as mentioned in this video?

Love this channel!

Omg what have I got myself into, I wanted to treat my room, so I search for help and now it feels that i’m studying rocket science. All this is insanely complicated. But your videos are the only ones that actually help me out to reach my goal!🙏🏼 Keep it up man!

Thank you very much. You actually put a smile my face. Because I'm in this exact situation. And a certain guy on KZfaq here is stressing me out with his videos that only catering for people with a lot of money. I guess he's a salesman at the end of the day.

Great videos

Amazing amount of great info! Would an acoustic guitar works as a Hemholtz resonator absorber? If so, would it absorb in the fundamental frequency range of the guitar?

Awesome video! :)

Are you going to do any videos on how you make your traps, plans etc? Thx

PSI AVAA solves many issues associated with pressure traps. My room transformed after adding 5

Hey there. Would love for you to make a video on building Helmholtz resonators and how to tune them

I have found garment racks with stacks of 6" plastic wrapped insulation to be fantastic and moveable. My question is what about hanging MLV on a garment rack? Either in combination or alone?

I like the idea of putting a diffuser front on your porous absorbers. Is there a particular way to design that?

What about passive, disconnected (maybe electronically) bass cabs? The resonance frequency may be listet in the specs and might be adjusted by an adjustable bass reflex tube.

As an audio and solar professional, I love your analogy, sir. Haha.

What do you think about a live end/dead end setup for the studio room ?

Hi my room at the longest length is 3.6m is it worth having a small primitive root diffuser at the back or just have some absorption with wooden slats over them to stop the room being too dead? Thx.

This video does a great job explaining that, but I can't stop thinking of the claim about the 40Hz porous absorber. Usually, in small rooms 10-15m2 in surface, the issues are usually the 1st and second harmonic of each axial mode (hopefully the room dimension ratio gives an even distribution of the oblique and tangential modes). So, if a dimension is 3m the first axial mode is like 57Hz (ish) and the second 114Hz. How are you going to treat that 114Hz (which is usually rings most) when the quarter wavelength is like 37cm? Assuming that you put a set of porous absorbers at 37cm on both ends of this axial mode, you are losing a total of 74cm. That is almost 25% of your space. Although the challenges to building a pressure absorber (of any kind) are true, they can still have a wide Q and hit "two birds with one stone". Not exactly ideal, but if you have a "non-ideal" room, to begin with, it's pointless to assume that you will have an ideal acoustic treatment... So I am kinda thrown off by the idea that pressure absorbers are impractical. I already built my studio in a terribly wrong room for that purpose (3.1x3.4x2.8) and I managed to get very decent acoustics using mostly Helmholtz absorbers. That room was in my own house, but now I have moved (because of work) and I am planning to treat my room (in a non-destructive way... ). My design showed that I need 3.6m2 for an 80Hz Helmholtz absorber and 1.8m2 for a 160Hz one. That is not much for 30m2 of free available vertical surface that I have available (excluding doors, windows, radiators, ceiling, floor)

To cover down to 40Hz with a 50% coefficient you need 10 inches and to increase the effectiveness, you have to go up to about 2 feet deep so for small rooms I don't think it's as "flexible" as you said. Although, small rooms usually need velocity absorbers because they are most likely to have resonances at multiple frequencies that are close to each other (the whole low end). On the other hand, membrane traps or diaphragmatic absorbers take less space for the same frequency and will have more efficiency than velocity absorbers. Membrane traps or diaphragmatic absorbers can also be designed to work with larger Q factors.

Can anyone help me with this… In regards to recording (not mixing) where would one put the diffusers? If the front wall is the wall I’m facing when I’m on the mic. (Assuming walls are thoroughly covered with velocity panels.)

Can you please comment on Output's new bass traps? They look amazing, but it makes me wonder if they actually work...

PSI Avaa 20 is a pressure trap that circumvents all of these issues apart from cost.

Hello Master Jesco, In my case, it's for a home theatre and I don't have the ability or equipment to do measurements as you mention in this video. And because my home theatre is also my living room, corner bass traps are not ideal. So if I'm to use made from a supplier, rigid fibreglass panels (6 lbs/cubic foot) covered with an acoustic tissue, can I treat my front wall with 5 or 6 inch thick panels of 2' x 4', placing 2 behind my L & R mains and 2 behind my large screen TV, all evenly spaced as a good start to treating my space? And will this control necessary low to mid frequencies to help improve my listening experience? I cannot treat side wall reflections because of my layout... only front wall, back wall and ceiling. I do have a thick rug on the floor between my MLP and the centre channel. My living room space is 20' W x 25' L x 12' H. I'm running a 5.1.4 set-up. Your advice would be Greatly appreciated. Anyone reading and that has experience on the topic, please feel free to share your comments as well on my situation. Cheers to all my fellow enthusiasts! 🙂

Ok this video convinced me I need another hobby or headphones xD

I wonder if passive radiators could be built into a box and tuned for bass absorption.

Hola Hermano. What is the best pressure trap? Helmholz? membrane? diaphragmatic?

You talk about the depth of the trap is important, but what about an air gap between the trap and the corner? Some say that it's enough whith 15 cm of actual trap, but it's important that there is a big air gap between the trap and the corner. Is that true?

is there anywhere else to asscess the guide? ive gone thru the steps twice with a 3 day span with no luck

A tube trap is a velocity trap then? (ie: ASC tube trap)

Is a diaphragmatic absorber a pressure absorber which is a resonance absorber, which is a membrane trap?

Great approach to bass trapping that makes a lot of sense. What is your take to constructing the entire walls for handling low frequency and reflection control? Philip Newell presents some of the wall designs in his book about building recording studios. Typically you would have several layers of materials / air (e.g. sandwiched drywall with dead sheet in between, porous absorption, dead sheet membranes etc., which is not tuned so keeping it intentionally lossy to have a broader band effect.

Wat is your opinion about ekustik bass trap they claim it absorbs from 40 to 80 hz!

Hi Jesco, first off I really like your practical approach to acoustic treatment. Most of us have to work with what we have rather than being able to build perfect rooms from scratch. I have a question about flow resistivity: at 1:50 in this video, as you adjust the absorber thickness you also change the flow resistivity value. Is there somewhere someone without a masters degree in physics can look to better understand that? I just want to model some very simple traps, but if 100mm is 10,000 pa/m2, but 200mm is 8000, and 300 is 5000 for the same material, how am *I* supposed to figure things like that out? All these calculators require a flow resisivity value, so how do I get that for my material? I can get the weight per m3 (which you've also mentioned elsewhere), but how does that translate for using something like the acoustic modelling calculator you often use? I don't if you'll see the comment on a year+ old video, but figured I'd ask anyway. Maybe someone in the community can help as well! All the best!

Do you have more info on velocity absorber? I am still kind of questioning how to reach 40Hz only with porous material. Great explanation btw!

ALREADY have two orders of base traps, dang ! :P

brilliant video. you've convinced me to pay someone who knows what they're doing, to do it for me.

what is flow resistivity ?

I have a 25db room mode at 100hz. It's very annoying as I cannot move my listening position nor my speakers. It sounds like without a major investment I might not have any options.

What brands carry velocity traps?

I’m in office acoustics and recently my son asked me to treat his home music studio, I learned a lot from your videos and it’s a totally different business but we managed thanks to YOU !

What would it take to build a velocity trap that goes down to 40Hz?

So with a 12x18x8’room and a $5000 budget... $2500 for an AVAA and $2500 for porous first, second, and ceiling reflections and diffusers on the back wall (12’ wall)? AVAA is 14-150Hz and placed in the corner behind the sub which is located off the corner 3-4 feet.

He's the Vsauce of acoustics

The more i hear the less i am inclined to start lol. Its my livingroom, no room for huge traps lol Is a big L shaped couch a good absorber? 😆

Now I'm thinking I'll buy a really great set of headphones and headphone amp....

Man this guys gets it. Finally someone saying what needs to be said. Newsflash: this is all physics, and you can’t argue against this. You wanna absorb bass below 100hz? Good luck. It’s just reality. Unless your panels are 5 feet thick ( literally).

Under 100 Hz, just use subs and EQ. Much more effective, and...bass!

Fuck me, just buy headphones!

FFAAAAACCTTTSSS!!!!!! I mean you're crushing my hopes and dreams, but I'd rather start with the truth instead of pretending that things will just work by magic.

When it comes to bass management, Bass traps aren't all that effective and definitely aren't worth the cost and space. The solution is relatively simple, Is cheaper and most importantly is actually effective. That is multi sub-woofer set up and DSP correction.