This Generator Quiet Box has a SECRET!

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This is no ordinary quiet box, specially built for a fairly large 7kW petrol generator. The inside features Helmholtz Absorber Panels to help reduce the noise and specific frequencies that the generator produces. The result is very effective at damping the noise, and I can stand right next to it and have a normal conversation with someone without shouting or even raising my voice even slightly.
I asked my neighbours if they could hear it, and they said they did not even know that I had a generator!
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Опубликовано:

28 сен 2024

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Комментарии : 101

@brentmchenry9273 Год назад

This is one of the most creative and practical uses of acoustic research and development I have seen in a while! Great video and looking forward to the new content

@SoundBlab Год назад

Thanks man!

@ubacow7109 Год назад

I wish you did a measuments with a measurement mic to compare before and after to see what frequencies were tamed

@JakesMusicPalace 2 месяца назад

Excellent video and use of ancient technology. I’m an audio engineer with 40 years experience in designing systems. The Helmholtz resonators were used in the grand gallery in the great pyramid of Egypt tuned to the resonant frequency of hydrogen. Chris Dunn, get his books they are fabulous, and some acoustic engineer friends of mine went there and did some extensive research on this subject. You could certainly target some of the major frequencies via phase cancellation. Using them to quiet generators is genius👍👍 thanks for sharing, nice work. Now about those calculations to determine the size and cavity dimensions of the resonators….

@dougcorea6508 Месяц назад

What about the calculations? Please elaborate more I appreciate your detailed comment

@Tiersmoke92555 10 месяцев назад

I'm loving your venting

@jonfranklin9361 8 месяцев назад

This is super cool! I used to build speaker boxes for car stereos. Me and my buddy build some wild stuff.

@mickwolf1077 8 месяцев назад

Your approach was great, measure the problem sound frequencies and suppress them accordingly. I'm going to work on one too but for a single cylinder diesel generator. It sounds like a distant helicopter and makes everything rattle. I was even thinking of using concrete too as it will be permanent for occasional battery charging in a residential area.

@marksmith4539 9 месяцев назад

The best DIY Generator enclosure on You Tube. Great build. Thank you for sharing all of your research and the build process.

@SoundBlab 9 месяцев назад

Glad you liked it! Thanks

@yogaforsuccess 7 месяцев назад

Thank you for sharing. Learnt something new today

@AndinKansas 11 месяцев назад

That was amazing! Thank you

@SoundBlab 11 месяцев назад

Glad you enjoyed it!

@pmarreck Месяц назад

You could probably make a business out of making these for various generators, because one of the biggest (ok THE biggest) argument raised against them is the noise problem. You could custom build them in parts and then ship them with assembly instructions. Great to see that doing a little homework (it's interesting that these have to be custom-built based on the specific frequencies you're trying to neutralize) paid off. I'm currently researching the tradeoffs of a 22kW generator as my power needs are a little higher...

@spongebob1712 7 месяцев назад

Dig a shallow hole in the dirt and run the exhaust pointing down in it. The dense ground will absorb most of the noise.

@jackd2083 4 дня назад

If you’re handy you can extend the exhaust into a container of water to quiet down the exhaust. Same as most inboard boats. If you enclose the generator, have the water container in a “chimney of sorts” that vents to the outside. In the winter you should replace the water with RV antifreeze or even windshield washer fluid.

@1997LT1Camaro Год назад

Most effective sound cancellation I have seen in these generator enclosures. What do you think the build cost you?

@SoundBlab Год назад

Thanks. Approximately US$500

@Aggielandtutoring 10 месяцев назад

Awsome video! I'm ready to start building mine, but I would love to "cheat" off your design. I think I can figure out the number and size of holes to match my generator's acoustics but "reinventing the wheel" is never fun. So if you had some rough measurements to provide that would be fantastic!

@Aggielandtutoring 10 месяцев назад

I'm sure you know this, but you really could make some money by selling the plans with referral links to everything you are using to do this project (from the sound measurement app, to the hardware, and everything in between). The plans don't even need to be that detailed. You have a lot of subscribers and this video is starting to get some traction in the DIY market in the US. Really looking forward to hearing back from you and crossing my fingers that you will pass along some dimensions.

@SoundBlab 10 месяцев назад

Thanks for the feedback, Very helpful! Hopefully I can get some time in the new year to put something together.

@ddc2343d 2 месяца назад

Growing up my dad would get so made at us if we used the pull cord on lawn mower like you are doing here. He'd always yell, make sure its has resistance before you pull or you are going to break it.

@dragonlotion1789 2 месяца назад

Please give us a general list of materials list needed. I’m a carpenter so I don’t need dimensions but I’m not too familiar with acoustics materials and sealants. I have a Generac and I’d rather sit without power than bother my neighbors with this god awful noise, so this would be very helpful, if you find time. Thanks

@susansnow4894 2 месяца назад

You won’t care after 2 days! Your neighbors need one too

@adrianbennett9322 Год назад

Soundblab, where can one get that same "egg crate" foam from? I am battling to source it from car audio places, for car door quietening.

@SoundBlab Год назад

This foam is rather dense and heavy. Its not the typical cheap low density foam often found. I got mine locally, not sure where you can find it, but try a search online.

@fredasiong 4 месяца назад

do you have a plan for sale?

@SoundBlab 2 месяца назад

Not yet, but hopefully i will get a chance soon to make plans available and do a follow-up video perhaps.

@MudflyWatersman 11 дней назад

Cheap loud generators are never good choice ....even for construction

@dml2205 2 месяца назад

the box cost more than the generator

@DonFarmer-hq5sw 27 дней назад

Why did you choose such a bloody loud generator to begin with. Surely a Honda would have been a far quieter choice.

@SoundBlab 25 дней назад

This is not louder than a Honda, and a Honda is twice the price.

@DonFarmer-hq5sw 24 дня назад

@@SoundBlab surely you jest ? 🌬️🌚🎪

@seymourscagnetti1413 9 месяцев назад

Removing one's shoes and socks, insures the body will be a direct path to ground for current to flow.

@superspeeder Год назад

Awesome project! I was thinking of ways to keep generators quiet recently so the timing is perfect. I love the scientific approach you took!

@SoundBlab Год назад

Thanks

@cyclonetcracer 4 месяца назад

Can you provide some approximate dimensions? Impressive build. Thanks for sharing.

@markwilliford5319 2 месяца назад

Dear South African Government: Please hire this man to run your electric grid.

@danielfarrera2396 3 месяца назад

@SoundBlab This video is great. It’s the first one I’ve seen that provides a detailed technical analysis on noise reduction. I’d love to see the final assembly and know if there are plans or a materials list to build something similar. A follow-up video on its performance over the years would be fantastic. I believe you could generate a lot of content on this project alone. Also it looks like you used independent panels, and I’d like to see how they are fastened, how to disassemble them for maintenance, and the overall mechanical aspects of the assembly. All aside thanks a lot for the video and the rest of your content. 😁

@SoundBlab 2 месяца назад

Thanks. Yes, I should do a follow-up. I have been aiming to draw up build plans, but time always seem to catch up to me...

@DanielLopez-jv6zk 2 месяца назад

⁠@@SoundBlabthank you! I’m glad you mentioned I will wait for the plants.

@danielfarrera2396 2 месяца назад

@@SoundBlab thanks a lot!

@ericallen7200 Год назад

I had to fire up my 11kw generator 3 times in the last couple weeks... about 20 hours each time. I was unable to get a nights rest when it was running, and neighbors as far as 5 homes away were put in that situation thanks to me having AC during a power outtage. I'm trying to come up with something to make it quiet. I was thinking about another neighbor who bought a generac that was set up in a cabinet. NOPE. Not quieter than mine at all. So I'm really really interested in a quiet cabinet, but so far, it's all short video with no real proof on how quiet they are, or short videos that don't actually give you a full build list and show the cost.

@jtmg11 Год назад

Alright you take the top spot in this niche category! (by far)

@SoundBlab Год назад

Thanks!

@wazza33racer 3 месяца назад

Thanks for sharing your experience! What was the before and after db?

@lapinfurax615 Год назад

Excellent ! I saw recently a lot of videos about this subject ! and it s the best off all ! Thanx a lot for this video

@SoundBlab Год назад

Thanks!

@MacStoker Год назад

would q acoustics Gelcore® improve it? i know they utilise the helmholtz technology as well...

@SoundBlab Год назад

The Gelcore will work well to help dampen panels and prevent resonances.

@RayleneCawood 6 месяцев назад

Mooi man! :) There is plenty of info on using a Helmholtz and/or a quarter wave resonator in the exhaust itself. You also see them on the intake systems of various motorcars. As this is a fixed rpm engine; I look forward to part 2 where we can hear yoiu breathing next to the genset. Another idea: A French Drain is basically a anaerobic 'digester' that produces methane that could be piped to the intake very easily with a thin tube to help with fuel. Perhaps add a tethered weather balloon for gas storage. Not a necessity yet but we all know sewerage will follow power into obscurity here, just as it has in rest of africa.

@dhenn135 10 месяцев назад

Do you have plans available for the generator box?

@SoundBlab 10 месяцев назад

Currently no, but if I get time next year I might consider it.

@MD.ImNoScientician 17 дней назад

@SoundBlab Thanks for the video ! How did you mount your axles onto your generator?

@privateuser-xp4nz Год назад

How will you protect the box from weather It will need a roof

@SoundBlab Год назад

All panel joins are sealed with weather strip. The box is made from weatherproof ply, and further sealed with a good quality roof paint. So far, it is holding up very good with no leaks.

@larryadams4358 5 месяцев назад

Very creative and outside-the-box thinking.

@pmarreck Месяц назад

Pun intended

@TAGUPNBLUE Месяц назад

Generator way too big 5,500 W is more than enough you need longer run times f o r fuel consumption

@pixelpearlproduction538 Год назад

Can u by any chance make and sell these ? I have the exact same generator and would love to have this quiet box

@SoundBlab Год назад

Won't have capacity to build. But I'm hoping to get some time to draw up build plans. Not sure how soon that will be though...

@mrjackharbour Год назад

@@SoundBlab Love to purchase them if you do.

@busterhyman6633 Год назад

I suspect this is going to get very hot inside. Gas flashpoint can be a low as 140 degrees good luck.

@nyteification8801 Год назад

I'm very curious about this too. I'm looking to build a quiet box, but am very concerned about heat and how to properly dissipate it. Have you noticed any issues with heat? Do you have something built in to manage it?

@elcouz 6 месяцев назад

Did you mean autoignition temperature?

@TiredOfApathy 7 месяцев назад

Given the inside heat, I see a lot of people using materials to withstand 250 degree etc. Is that one fan enough to keep the generator's heat from creating a fire risk in the enclosure?

@SoundBlab 7 месяцев назад

It's a year later and so far it has been working great. It does get hot inside, but that is to be expected. The one fan has enough CFM to get rid of the hot air though.

@davidschipsi1316 5 месяцев назад

@@SoundBlabit is highly preferable to have duct directly to the engine cooling air intake, alternator, and carb. This way the equipment sees the coolest air possible instead of air that gets recirculated heated up in the cabinet. I understand you have the fan. Almost all home made boxes have heat problems. It would take some creative fabrication.

@adrianwilliams763 Год назад

Elegant solution

@SoundBlab Год назад

Thanks

@Paunguliaq 6 месяцев назад

Thank you for your technical expertise. It's quite impressive. Thank you.

@SoundBlab 6 месяцев назад

Many thanks!

@sharkbite1686 9 месяцев назад

It looks like you only made panels on 3 sides for the resonators? Looks to me like the rear top is the 60hz, rear bottom is the 240hz, and at least one partial side is the 480hz (both sides?)? Are the front and tops just simple flat panels with damping? Really would have loved a slightly longer build montage showing more of the assembly. Really an epic box and I’m planning on making a smaller version for a portable generator

@SoundBlab 9 месяцев назад

Thanks. Yes, that is more or less correct. I was hoping to do a more detailed video, but I needed this up and running, so unfortunately the video is rather quick and to the point.

@sharkbite1686 9 месяцев назад

@@SoundBlab no worries I understand. Does the size or dimension ratios of the box matter? Not sure if room modes matter for this application.

@tristanschaper281 Год назад

Very well done!

@SoundBlab Год назад

Thank you very much!

@Lastcallrepent Месяц назад

Running hot 🔥

@diepieche 7 месяцев назад

Amazing. Thank you for giving some insights and enlightenment.

@SoundBlab 7 месяцев назад

Glad it was helpful!

@Shaddow-r3f 10 месяцев назад

Hi, what is the specification of the fan that you have been using? what its size? Is it pushing air out or pulling air in? [there are two types] What is the heat that it is build up in the chamber during hot wether? thanks for your response.

@SoundBlab 10 месяцев назад

The fan is 10inches or 250mm in diameter, and it pulls air out of the enclosure at 1100 cubic metres per hour. The generator does get hot inside, but so far I have not had any problems with overheating and the temp stays constant. The box is mostly in the shade though, this helps. I have run it between 2 and 4 hours at a time, and it is still going strong.

@Shaddow-r3f 10 месяцев назад

Very nice work you have inspired me@@SoundBlab

@maxjerin 9 месяцев назад

Will there be a need to combat mold and mildew?

@SoundBlab 9 месяцев назад

I have not encountered this at all so far, so no need. Enough ventilation through the enclosure.

@cayrick 10 месяцев назад

Very well done! Too bad you did not take sound level readings. Wish I had a neighbor like you instead of the guy next door with an elevated open generator that faces directly towards my bedroom window.

@SoundBlab 10 месяцев назад

Thanks. Sound level meter readings can be very misleading, and cannot tell you what it really sounds like, thus I don't like using them for this type of experiment.