4. Sound Power - Loudness and Level

[@manimz39]

my man your videos are amaizing, im a sound engineering student, and we had these subjects in our acoustic classes, but I quite didn't understand, partly because my classes are not in my mother language, but I'm gonna send your channel to all of the sound engineering students i know, which I know they usually have problems with acoustics as a subject.

[@akashmurthy]

Thank you very much! Glad you like it enough to share! All the best with your class

[@bah273]

Great Videos! Thank you for making everything crystal clear. You have a great way of explaining things.

[@akashmurthy]

Thank you very much!

[@jiuwang2636]

@9:21, you are not entirely sure how useful this information is. Let me tell you, this whole video is very useful, helpful, and well made. Thank you.

[@VegasOct1Sounds]

Thanks for your dedication and wonderful videos. I have enjoyed every video. Acoustics is a complicated subject and your videos help and I can point people to them when needed. Thanks again.

[@akashmurthy]

Thank you very much for the kind feedback! You've got a really interesting channel as well!

[@chitrung92]

Hi! thank you for sharing knowledge. One quick question at 9:14, how come there is an absolute value at the 10log(q/4pir^2)? This mean that whenever you get closer to the source than 0.282m, the spl actually get quieter? How can this possibly be?

[@akashmurthy]

Hello there! Great observation. I was thinking about the same question when I was doing the research. The reason why I didn't explain this in the video was that I wasn't a 100% sure. So the idea of sound power is purely theoretical. It's calculated for a point source. Point sources don't exist in nature, and for geometric calculations for surface area (to calculate sound pressure) we have to use a unit source rather than a point source, because the surface area of a point source is 0. In the metric system, the unit of measurement is a meter. So we consider a spehrical source of sound rather than a point source. If we do this, then the sound power is emanating from the surface of this sphere, so naturally the sound pressure will be maximum at the surface (0.282m). If you go lower in distance, it's almost like you are going into the source of sound, which doesn't make sense. But you can also think about it like this: You have a speaker in a cabinet. At the cone of the speaker, sound pressure is highest. But if you go further, you go past the cone and into the cabinet, essentially going through the source of sound to the other side. And if you think about it, sound pressure will be lower within the cabinet than at the cone.

[@triceratops3439]

Your videos are great! More people should watch them!

[@akashmurthy]

"If you build, they'll come" Thanks for checking it out!

[@snoozieboi]

Yeah, I have to just comment again, it helps the algorithm as well. I am a mech engineer thrown into dB noise inspections and thought that dB was dB and that's the end of that. I'm like the weirdest engineer out there, like an artist stuck in a engineer body. Your amazing ability to master teaching, visualization and all the other stuff end to end is potentially a bigger feat than you might know yourself, it might come easy for you because you're talented at this. A professor might be amazingly skilled at this but lack the entire brainwiring on how to teach this away in a logical manner. This is possibly the 4th or 5th time I revisit this series just to see how much I understand now compared to last time, I'm such a slow learner in some areas and easy to confuse, my brain isn't made for math despite me being an engineer, but here you are blending my need for visual input and not just 30 repeats of using a formula to slowly grasp it. What I do is witness noise tests for equipment going out to industrial clients/plants, and with all the info I take in I feel l like it easily knocks me off my feet and I get confused. Like in this video how you explain and visualize ALONG with the math, it's silly, but I think some of us visual learners basically needed to see that "globe" shrink and be spoonfed that r shrinks. Otherwise it ends up like how a lot of Calculus' math was for me before youtube etc, some of it felt was so abstract I just accepted it as algorimths to get to the answer needed on the final exam. For somebody with a typical math brain I think my type of brain is very hard to understand and it was quite frustrating in uni.

[@akashmurthy]

@@snoozieboi thank you for the write up! Let's hope the algorithm takes note 🤞 I'm a slowish learner as well, and mainly excel in the visual medium.

[@puspamadak]

I had many confusions from my Physics classes. Your videos were suggested by KZbin for the subject of acoustics and they are truly interesting!

[@akashmurthy]

Cheers! I'm glad it was useful!

[@cinematichormone]

Thankyou sir, finishing it today

[@SadiqUllah-f1d]

Great effort

[@sycamore2376]

Your videos are brilliant! Thank you very much.

[@akashmurthy]

Thanks very much for checking them out!

[@trunghoangchi1403]

Thank you very much

[@akashmurthy]

You're welcome!

[@sebastianvallejoperez9754]

Is it ok if I show parts of your videos to my students? The graphics are really useful and quite entertaining. Keep it up!

[@akashmurthy]

Ofcourse! Go for it.

[@drvinothkumarj1491]

The ability of source to produce sound is described by a.sound power b.sound pressure c.sound energy D.sound frequency Need help with correct ans

[@drvinothkumarj1491]

Anyone pls help me with the right answer p

[@JustMoseyinAround]

This is actually quite useful. Thank you.

[@akashmurthy]

Cheers! Glad you think so..

[@lococura]

THANK YOU