Standing waves in speaker boxes

[@isaelalberto748]

I've been searching for quite a while for videos discussing the shapes of enclosures concerning standing waves, and all videos produced in my country, even from the most well succeded audio youtubers, just say only the volume of the enclosure matters, the shape doesn't. I even called a local manufacturer to check, and he insisted on that (which is published in the users' guide). I'm glad I tried searching in english and found such good channel with detailed discussions and grounded information. =D Peace!

[@pabloosvaldopenizzotto1098]

Excellent video! I have had my own experience adding damping material ( a lot) on top and bottom of my Pure Acoustics Junior F tower speakers and the result was very impressive. My speakers do not have the original mid-woofers. I have upgraded to a better-quality Kevlar mid-woofer. The new ones are more powerful and have a better bass response, so a resonance of about 400 hz was developed in the cabinets. That happened not only because of the upgrade, but I think is mainly because of the reinforcement of the lateral walls of the cabinet I have also implemented. To improve this I added a lot of polyfill (vellon siliconado in Spanish) on top and bottom. Previous to doing so, I plotted the impedance graph of the speakers, showing the 2 big peaks below and above the tuning frequency of the port, plus one small peak due to the cabinet resonance (I guess). After that the impedance plot turns very smooth and these two peaks almost disappear, the same as you show in the video. The result was that cabinet resonances stop masking what the drivers are receiving to be reproduced in the signal. That means that a lot of small details in the sound started to appear. I highly recommend to take care of building very sturdy and robust cabinets in DiY projects, and/or improving the strength of your speakers in case they are budget speakers with thin walls. Best regards

[@davidzoller9617]

Nice straight forward content.

[@rscraftspace765]

Am the bigg fan of u❤❤❤ recently i purchased ur course from udemy....

[@EngineeringEssentials]

Great information. Excellent work !!

[@andreimerisanu9995]

Excellent explanation of this concept, thank you! Got me wondering if some of the midbass response issues we see in car doors are also caused by standing waves...

[@jerichotm2122]

Thanks! Now I know which is the frequency of the standing wave that I might deal with! Great knowledge! But, I want to ask you something with regards to the room which the speakers are placed into... I had a problem a while back and not be able to identify, since I have used damping material correctly... at about 70Hz there was a huge booming sound that was so loud, that I could not be able to stay in the same room with the speaker, even though the volume was low! Once I moved the speaker into a larger room, the problem was fixed, and I've noticed that, in fact, my speaker sounded terrific! The question is: how important is the room in this case? Is it crucial or what happened to me was because I designed my enclosure poorly?

[@leif8436]

As always a very good video! Keep it up

[@stevenleito01]

Hey do you have any designs for tower speaker similar to focal chorus 836 ?

[@beck645]

Outstanding video

[@WizCreates]

Very good video

[@イエンスヨハンセン]

superb video -- thank you!

[@keithbill310]

Thank you .. very interesting.

[@marcoferrari152]

Very informative video, thanks for it! May I know from which textbook those golden ratios come from?

[@AudioJudgement]

If I remember correctly, those ratios are from a seminar on AES. If you pay an annual fee, you become a member and have access to all of the resources there.

[@jeremyphilander8833]

could you explain how an amplifier can take a minimum load. some take 4 or 2 ohm. how is this defined. great video.

[@AudioJudgement]

It depends on how the amp is built. If it has a 4 Ohm minimum load and you connect a 2 Ohm speaker, it will shut itself off. The amp will deliver more and more power as you connect a driver with lower and lower impedance. However, it will also heat up more and more. At some point it will start to overheat and destroy itself. That's why there is a minimum load rating and if you go beyond that, the amp will shut off the protect itself.

[@robint6582]

Fans ❤from India

[@jbarelds78]

Great video. Up until now standing waves were just theory to me, never saw the real world effects demonstrated so clearly before. Am I correct to assume this standing wave issue is not really a problem at higher frequencies, because of the lower energies involved? And as a result, using dampening material on the vertical panels isn't as important?

[@colbydolby6559]

Where was I, 6 months ago? I don't know how I missed this video but it's an excellent one. The information you provide is informative and educational. Thank you Marius. Do you have an email where you can be contacted?

[@BadescuAndrei]

Do you also sale what are you building?

[@Vuelterrueda]

What would be the effect of non parallel cabinet walls? Is it worth the hassle?

[@Andrewatnanz]

Did you ever get an answer anywhere? Ive been interested in this question as well.

[@Vuelterrueda]

@@Andrewatnanz I've never seen a formal answer. I made a pair of slant bookshelf speakers some years ago, but I lack the equipment and skills to properly perform a comparative test. I plan to make a straight wall version in a couple of months, but they won't have the same air volume. Honestly, I do not think the difference is audible and room reflections (standing waves outside cabinet?) are much bigger of a deal as I've found particular spots in the room where bass clearly cancels out or increase, "reverb" that changes when certsin door is opened, etc... 🤔

[@Rene_Christensen]

You will still have modes (standing waves) but they more difficult to calculate.

[@yuvrajsingh2696]

I made a 2.1 channel home theater system. Behind the system the bass is good but very bad in front of it. How can I get a better bass in front of the system.

[@AudioJudgement]

A good trick is to put the subwoofer in your listening spot (most likely on the couch) and play some music. Then walk around the room and check how it sounds in different spots. When you find the spot where the bass is just right, place the subwoofer in that spot.

[@yuvrajsingh2696]

@@AudioJudgement Thanks. I will try it.

[@sometimes-sound]

@@yuvrajsingh2696 And... some improvements?

[@גדאור-ג7ע]

great man ...but the golden ratio is 1.618 i dont understand where did you get the numbers...please explain. thx

[@AudioJudgement]

Those are called golden ratios because those are the best proportions to minimize standing waves. They got nothing to do with "The golden ratio"

[@alxdava2004]

You know what would be extremely interesting? To make some very narrow speakers that can be put near the wall. I need something like this, not a direct competitor to Nautilus, but a very good sound.

[@Andrewatnanz]

Does odd shaped boxes help? There is another guy on KZbin that makes Pentagon shaped boxes.

[@AudioJudgement]

It depends. If you make a pentagon with equal sides and the speaker perfectly in the middle, then it's a bad idea. However, if it's an irregular pentagon it could work very well.

[@olobiksnagol2178]

This may be a naive question, but what chamber or will it be chambers, or the whole box that I would have to consider to eliminate suspected standing waves?

[@Carl_Jr]

A sphere

[@davidristic3800]

open baffle

[@albertcastells4630]

Also at 642Hz (214x3)...

[@saturnfrak]

Going to measure lol everything I can