How to Make a Rotary SubWoofer
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- audio App SmartPhone Air Blower • audio blower
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Hi folks today I’m going to show you how to build yourself and make a home maybe using a 3-D printer or a CNC meal simple
Subwoofer
Usually to create a subwoofer, you need to have a huge magnet and a paper corn with copper coil inside connected to an amplifier. This mechanism will start to produce magnetism that sucks and pull push the paper backwards and forwards.
The result is that we have very strong base coming from the Subu for Paper cone
So if we want to have a huge and powerful subwoofer, we absolutely need to have a very expensive and huge magnet and very precise made paper cone
Which are basically impossible to have to complexity and expensive cost
We can use a huge motor higher torque has the higher RPMs can reach the higher is the power of our subwoofer
So basically is a cheap way to sound just replacing and choosing the right motor
Be careful, don’t exceed with the RPMs of the motor. Otherwise the centrifugal forces can make the whole project crash on itself.
Seriously golf force will expand molecules of the parts, and at one point everything will crash outward
Basically, the motor will speed always at the constant RPM, and the propeller always spin flat with no air proportion at all
So the blades are just there and cut the air without moving the air at all when it’s not activated from a base
If we change the page, so the angle of all the blades in one single moment, we can introduce a very strong air movement that is similar to the air movement of regular regular Subfer
This happens very quickly, and will produce a change of pressure in the room, and we can clearly feel it with our body
Of course you can make things if you make the propeller bigger or if you place in front of an open window with around around it
This is important because the fan blower we just made have to create a change pressure between rooms
And that’s the reason why we replace it in front of the window so that we can take the open space air and push it strongly inside the room
Parts, using a 3-D printer and a CNC machine that machine full block of alum
You can imagine that these weird shapes are very difficult to machine for this reason I decided to use 3-D print service online and I receive all the parts in four days
Instead of the solenoid you could use the speaker driving coil directly.
It will also move the blades sinusoidally instead of triggering them only on or off like the 'noid does.
I think in this case, since he's driving the solenoid with an audio amplifier, the solenoid is moving sinusoidally. The more current that passes through the solenoid coils, the more it deflects against its spring. But I think it still cuts off half the waveform, so you're right, a speaker coil would be better.
@@isaiahhiggins this, he is only getting half the waveform, big, I mean HUGE voice coil surrounding the shaft with the magnet incorporated into the spider would give the full waveform pushing and pulling air with a neutral point for the blades. If at that point the mass is still a problem mount the magnet around the shaft, and the voice coil to the spider fed via brushes on a slip ring. ideally all that structure needs lightened and stiffened. Time to play with some Carbon fiber I would say, oh and build a duct around it, or even better incorporated into the prop ends as a pivot to not only increase the strength overall, but also boost efficiency. Awesome video!
He could also go with 2 solenoid anti-parallel mounted (with diodes, fast demagnetizing, etc.). The other, more trickier, would be maintaining the solenoid at 50% load when centered. However, we can find multiple improvements, this physical swash setup doesn't allow proper sinusoidal response in the first place, last place being the blades bend/deformation when pumping the air. It's a very tricky design to get sinusoidal waveforms is an understatement.
You can use a solenoid but have to modify it so the iron is centered in the coil. In this way you get full sinusoidal wave form. Then center the blades so they can move "positively" and "negatively". This will not be HiFi but for bass effects it is close enough. Then limit the amount of movement from the blades, they really don't need to move much to get big amounts off air movement.
The power is provided by the motor, you don't need a big amplifier to drive the pitch of the blades.
Better is to use and old voice coil from a big speaker and drive the system like this with spiders to center the coil. Less parasitic noises.
I have seen some kind of conception in an old theater. It was driven by a really tiny tube amp.
It works only on frequencies below 20 Hz, event below 10 Hz it comes alive.
It is not commonly used because the equivalent air volume is so big that to load it you need a room size baffle to house the system. It works in a chimney vented to the outside. Dis is how it was mounted in the theater, big pipe to the outside on the roof.
@tripplefives1402 nope, not at all: solenoids with iron core don't behave like magnet core solenoids.
I'm seeing more and more people discover and experiment with rotary subwoofers, and that excites me! It's such a niche device but so powerful.
Didn't know you had shut down your old channel, and I'm glad the algorithm recommended your new channel, your videos are great!
You explained at the end that there's a limit to how fast it can change pitch, but don't forget you're only using half of the wave with the solenoid. If you use a subwoofer driver to push and pull the copper sleeve, you should be able to reach 5, maybe 10hz continuous, but you'd need flat blades so you push and pull
Wouldn’t that make this idea useless? The ticket would be a spring controlled fork like a clutch bearing on a Manual Transmission
Rulof never ceases to Amaze me, Every single Project is an awesome amalgamation of stuff no one has even thought of making. This is Precision Engineering Mixed with Chaotic Thoughts. Cant wait till you have the 5-10mil subscribers you deserve man.
man, when I found your channel I thought "thats one odd guy"
but your ideas are really, really interesting, and the stuff you build is really quite good. you manage to actually build new and interesting stuff that works. Super cool, man!
You need to use a solenoid that allows for more than 2 positions. This configuration only lets you play one note
Actually, only half wave.
I’ve been super interested in these, but never found somebody playing with them with this level of innovation and creation. This is awesome.
More stuff about this thing, less rattle and maybe the fan connected to the normal subwoofer so you get the 30hz perfect and the fan does the under 30hz real low stuff
My new favorite quote "it's kinda of like a fart in a windstorm"
I really like your down to earth approach. Just being a normal dude in his workshop screwing around.
Normal dude with printers to make everything us normal dudes cant make
Balancing of the rotating weight and flex connection on motor and shaft is really needed. Also sound insulate the solenoid or replace it with speaker coil to play other than one tone.
awesome finally somone hasnt used 3d printed parts wish i could machine metal that good
ive usead -weerg that is a cnc service online
im almost positive youll need to remake the blades out of metal there cannot be any flex at all ,and i think you should wind your own huge chucky voice coil along the shaft ,as the solinoid is trying to lock the pin in which is counter intuitive@@rulof-is-how-to-make
the solinoid has thick windings but you need lots thin thinner windings .using the voice coil from a dual voice coil subwoffer will work good too
ive only seen one audiofile grade rotary sub and it was like 100,000 or something stupid like that but it was so good that the motor and the blades were silent when spinning with no music and when the music played there was no air noise only the really low hz and the blades on that were quite thick metal
@@angusmcgilthat would be the Thigpen Rotary Subwoofer by Eminent Technology! I think it's the only "commercially available" rotary subwoofer; the rest are home projects!
Really cool, Shows what some things in life can do. Yet original subwoofers are not beaten. always better
Awesome , sound would be alot more distinct and hearable if there wasnt so much play between blades and the copper part that spins . . Look up pierigo engineering's example on this to see how more rigidity makes it sound 🎉
I really enjoyed this project and I’d encourage that you come back to it to add a bass box to it. The enclosure of a bass or subwoofer is crucial to its sound, the boxes usually have resonance in mind to allow you to get that amazing deep vibration you were wanting. It requires a bit if work with fluid dynamics and material resonance but this project can become a really powerful bass if you were to add some resonance. Love your content man, keep it up!
You should've put heavy springs on the cylinder instead of a dead stop so can also move forward more for certain frequencies.. I think having it equally able to move forward and back would be so much better.. But I'm just a kid what do I know.. Awesome video
You want as low a mass as possible to have move at audio frequencies. I would suggest embedding neodymium magnets into foam blades, or turning a shaft that runs the length of the blade, twisting, and making electromagnets in the hub, fixed (but spinning). You would need rotating collar contacts on the main rotor shaft. You can then match the impedence of the coils in the electro magnets you built to the expected impedance of an audio amplifier, typically 8ohms. If you use a stereo amp, you can use one channel to push and the other to pull by inverting one channel and use a second array of flipped magnets and coils. You need to put a low pass RC filter ( 2 or 3 passive components, maybe a variable resistor to adjust frequency) between the mp3 player and the amp, to filter out anything the speaker cannot handle, I'd take a guess at 100 hz or lower. The stereo signal has the same bass on each track, so if you're not using a stereo amp, just use one, you need a low pass filter for each channel.
You really want blades with a symmetrical profile, and it's my guess you want to reduce the space between the blades and the hub and the blades and the rim, so you might need want to widen the non oscillating center of the hub and put a ring on the radius, so you're more confident getting it close to the hole.
Nice video man. Keep it going. I have a suggestion. I think you can get even better results if you could vary the pitch continuously rather than it being fully open or closed.
depends on the "song" but i have to test it! thanks for the suggestion!
@@rulof-is-how-to-make I think with variable-pitch propeller RC helicopter, you could do exactly this. They respond very quickly to input and can be very powerful. The biggest concern would be overheating the servos when articulating very rapidly. But the RC helicopter might be up to the challenge of getting 1- 60hz response. Then it can be used in addition to what you have created here to supplement the frequency (since the volume would likely be lower than this behemoth since there is less torque from the RC motor). 👍
love your videos. Keep it coming bro. I like how you think and reuse stuff. Most buy new stuff for everything but you will reuse stuff.
Get rid of the solenoid and drill thru center of old sub glue pitch changer to center cone it will work waaay faster and better range
I'm sure putting in one more solenoid, setting it so that it makes forward and reverse contractions. In addition to making the tensioner much firmer without any play. You can get much better sound
Hello, man, thank you for sharing your project, I also made such a fan, built around a hoverboard motor, but I did not get any subwoofer pressure effect - and I found the reason in your clip - I do not have yet the separation plywood that should separate the two "rooms".
I see a problem in your design - the rotary plate that adjusts the blades should spin free from the main axle, but it should not move relative to the blades plate - otherwise the push-pull motion will partially get lost by the relative motion of these. Also, those bent wires have a lot of lag against the bolts - and again, you have mechanical loses there also, you should make some ball joints there.
Also, I suggest you build the solenoid around the main shaft, just attach some neodymium magnets to the sliding plate and just add 1mm copper wire coil in front of it.
Great and simple presentation!
Any reason the files are taken down?
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that Prophet Muhammad Sallallaho Alaihe Wasallam said:
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You could space out horseshoe magnets, three in a circle, and three spaced out in a row (9). Copper coil the rod, and run the amp to the coil. That'd give you the full wave. I'd be like the Jackhammer woofer design. You wouldn't have to destroy a speaker.
You don't have to have it at a window. You can run it under the floor, with open intake. This cuts the noise. Most bass is above the column of air freq. of the smaller area you'd have putting it under the floor. Most ppl don't want their lungs affected by a 1Hz signal, either. So, a movie or song would be practical with the floor setup.
I'm wondering why you were so technical and precise when designing the fan and blade assembly but went so rudimentary when designing the blade pitch device. That part is really the source for the actual sound and requires a proper voice coil.
That's cool and all but that celenoid doesn't go fast enough id recommend you check out other videos on diy rotary subwoofers people have solved the mass problem
Not only a membrane weight counts. But an amount of air displaced by the membrane multiplied by a factor which depends on a cabinet architecture (Qms mostly). This dynamic weight can be x1000 heavier than a membrane weight. So.. Recycle the solenoid, cause it has nothing in common to a sound, and try a "normal" coil + a magnet. A blade must have a special shape, so it returns to a neutral point with an air.
One way to stay cool while listening to music 🎶
Great job, thanks for sharing 👍
As a machinist I find it wild that this dude put all the time in to make SOME precision parts but then other things were insanely sloppy. Like the main shaft wasn’t even turned straight it, he just used raw stock. And that linkage arm was completely loose. I don’t get it.
the fan is done so well but the solenoid bit is terrible. if he did the second bit properly this thing would probably blow his roof off
Interesting work there!
Appena trovato sto account in inglese che non sapevo esistesse. Ti seguo da quando ho otto anni fra mi hai ispirato tantissimo con tutti i tuoi video durante tutta la mia crescita. mi sa che avevo pure costruito un fucile a caramelle con il tuo video certo due bottiglia di coca-cola che dovevo pompare di brutto ogni due colpi lo rendevano leggermente inutile però molto divertente e me lo ricorderò tutta la vita. Ti ringrazio. Adesso ho vent'anni e faccio ingegneria aerospaziale in parte penso un po' anche grazie a te. Spero tu continui così con tutti i progetti che mi sorprenderanno sempre. Ti auguro il meglio. THIS GUY IS THE BEST I JUST FIGURED I SHOULD HAVE WROTE THE WHOLE COMMENT IN ENGLISH.
Accent went crazy at 5:10😂
rotary subwoofers always excel with very low bass. anything lower than 30 hertz. Fun fact the human ear doesn't really hear 30 hertz well. Secondly if you made a port for the fan you could improve the sound clarity. Overall great video on the basics.
Thinking on how to accomplish this I wonder if releasing compressed air can be done quickly and accurately enough to give the sound better quality than trying to actuate the heavy moving fan parts? Or perhaps rather than releasing the compressed air entirely it could be utilised as the actuator and be filling an air sack in a box with a hole in it? I know you'll solve this one way or another! Good stuff as always :)
use a magnet on the solenoid shaft instead of the steel block so it can move bidirectional like a normal speaker, and adjust the amp output to not clip
thats a great idea! thanks!
Try one of those variable-pitch propeller from RC helicopters? Or even a whole helicopter; program the controller to the music and the helicopter could fixed in place. They responded nearly instantly, controlled remotely, battery powered (could be hardwired since it will be stationary), very powerful motors (both internal combustion of various fuels and electric ones are made), plethora of blade designs available or custom could be made, (they are expensive for strong RC helicopters)... But this seem ideal for your application.
Very very interesting, good job 👏, keep on going, u have a wonderful minds
Check out the Thigpen TRW17 it is basically what you built.
Hey man I’ve welded copper to steel before too and that’s not a good way to secure anything that vibrates trust me….
I think what he welded it to was the bolt and washer. True statement though.
That's brazing not welding
tube amplifier 💡- to keep warm in winter. 🔥
rotary speaker to keep you cool in summer. 💨
Crazy cool bruh ..
use the speakers coil instead of a solenoid
Slightly works at producing a half square wave every two seconds… but that will it never reproduce a sound track from music or movie sound track.
Install stone bearing or at minimum brass bushings & key the hub for the transfer bars…. Perhaps it’ll last longer than a week.
Def a cool build to troll the surrounding houses, add a keychain pushbutton remote so you can stand outside and ask hey where’s that thumping noise coming from while pushing the remote in your hand. 😈👹
I love the execution of your plan but due one oversight, this thing will never work at anything higher than like 4hz, because you're using a solenoid for actuating the fans, the solenoid is just like a on/off switch, there's no inbetween so it cannot oscillate or vibrate like a real speaker, a speaker's coil goes in both directions, inside and outside, you'd need a speaker to actuate and oscillate the fans for it to have any sort of actually bass response, as of now it's a giant air pressure changer.
I'd love to see you come back to this project in a future video and try using it with a real speaker, I've seen some videos of other people using it with reall speaker to drive the fans and it works really well.
Could You use compress air, and some valwe as a sub, to play music?
imagine being in the Army and reprogramming a helicopter rotor to play trap beats 😂😂
plans, specs, KITS!- more marketing , and OEM needed
Good video sir, please make a video on oxygen, hydrogen seperated cell if possible thanks
this is so cool
motor is now a Giant transducer. the REAL bass is At the Motor.
You need to play the music with a delay for the Bass, to Play it to the BASS, 1 sec before its from speakers.
This would be amazing for def people to feel bass..
Non spoiler warning - skip this video and watch another. Not worth your time.
PLEASE REMAKE THIS WITH A REAL SUBWOOFER REPLACING THE SOLENOID!!! 🙏🙏🙏🙏🙏🙏🙏🙏
Ah c'est le même principe que quand on roule vite sur l'autoroute avec une seule vitre arrière ouverte , ça fait des basses 😂
You should redo this video and tighten the part so to not rattle like with this one. Also using an actual speaker coil would work better imo
Do you still have the files? I'd like to buy them.
never light a candle. turn on the candle. 😂❤
can you recreate phoenix gold cyclone
Finally someone that doesnt hook the blades up to a subwoofer with a hole through it.
Would u sell all parts
bul bul ki tul mam ma tune un da 😂
that's a lot of power for only getting half the wave too D:
❤❤❤❤❤❤❤
Send one for testing
💖
people, please be careful, indoors and in the right configuration this, or even way smaller systems can EASILY reach power levels of air pressure change that can immediately und seriously damage internal organs, blood vessels, lungs etc, also from a distance ! in this regard, a rotary sub is a COMPLETELY different beast than any conventional high power car hifi system with normal subs that use much more wattage
Bullshit 😂😂😂
@@Drowning_Im nope
if built like shit, inefficiently, then yes, bullshit, but if built at least somewhat reasonably efficient, maybe just by mistake .. its quite dangerous, thats just physics
Couldn't you replace the Solenoid with a Speaker?
you Glue the cone of the speaker with the rotor
spero si sia capito in inglese, nel dubbio:
se attacchi uno speaker al posto del solenoide e gli fai ripordurre musica non dorebbe essere possibile far "sentire" la musica. ovviamente lo speaker dovrebbe essere in grado di sopportare la massa di tutto il meccanismo
Subwoofer my dude.
Call me a broke crybaby if ya want lol but i miss the days before all these material printers at home because i love doing diy projects on different things i can think of inuse yt videos as reference or complete guide but i xannot afford thsse printers and more
N more channels are srarting to use them so that instantly makes it a waste of time
To watch altho km
Curious i gotta make the time im on yt beneficial to production 😢
u should duct it lik an edf
Theaters, Cinemas, and Recording Studios, use giant sheets of metal, usually 3meters x 4meters (or bigger) usually in a basement normally. Better than any Surround Sound or Subwoofer you can buy in shop.
This is an impressive creation, but not a good rotary subwoofer. A binary solenoid is not a good control mechanism and the system is too large and massive, as acknowledged near the end. You can make these subwoofers follow musical waveforms and produce frequencies much higher than this one and there are examples on TH-cam.
They can be powerful enough to damage your house or things in it ;). Your spouse and neighbors might not approve.
PLEASE DOP NOT USE A SOLENOID - USE A SUBWOOFER!!!! (se my comment under the most like comment's reply)
Ha! Where do you dream up your made ideas! 😂
Old idea, but a bunch of people have been building these alot recently
Use a proper voice coil.
Rulof i zio can ,italiano linguaggio plis
Waste of time watching this. You can hook up fans to actual subs and get insane results.
Please make a RDE
Dude needs to get off camera and have a hott woman explain.
Moist
Doesn't work.
A fan can't be a "speaker", this doesn't make any logical sense and there's no way this could possibly work. This is obviously fake and any bass sounds it did apparently make are just dubbed in. Proove me wrong, unless I see one of theese in person I will remain skeptical. Also I wouldn't want a speaker system that constantly makes a lot of background noise.
I’m sorry, but you are very incorrect, it has to do with physics and this is actually a really good project. The base sound from the song he played was just overlay but he did adjust channels to allow the base he made come through. Research videos if helicopters running and listen to the noise they make. I really do enjoy a good laugh though, friend, thanks for a good joke 😁
Also, in reference to background noise, the only reason you wouldn’t want any background noise is because you don’t want to have ti fight to be star of the show, and in case your small mind can’t comprehend what that means, i’m saying *you* are background noise. Hope you like being a hater because it really gets your thoughts heard, huh?
@@isaacmurray8490 It's not a joke. This defies physics, maybe not in whatever reality you live in though, maybe the laws of physics are different where you live. I connected a fan to a big amp I have and guess what? Nothing! It wouldn't even turn.
@@CoolDudeClem wooooowwwww. Aren’t you a genius then? I’m surprised that troll’s law wasn’t taught in my college physics classes. Maybe i forgot but it has to do with the fact that he connected the solenoid to the controller? And I believe that speakers work by creating vibrations in the air based off the frequencies in the electrical signals created by that controller, then according to the laws of fluid dynamics, those waves are carried spherically outward from the source. Then, at least where I’m from, we can hear sounds with our ears that catch those waves in the air. Maybe the fact that, where you are from, physics doesn’t exist is the cause for your lack of logic and reasoning.
That's why it's a rotary *subwoofer* and not a rotary *speaker*