10 minutes to learn how to tune a passive radiator by Robot Underground 🤖💕 @RobotUnderground

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Жыл бұрын

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Пікірлер: 89

@davej3487 4 ай бұрын

When I tuned my 15 inch PR I did the putty test. Then when I had that weight I took some 6 gauge solid copper 'GROUND' wire and cut two pieces, bent to circles and soldered them into 1 ring then epoxied it to the outside of the cone, used a black sharpie to color them black.

@MF-vv9ky Жыл бұрын

I’ve always loved small enclosures with passive radiators. That was such a cool video you just did I enjoyed watching that.👍

@RobotUnderground Жыл бұрын

I'm glad I could help MoFo. Some day, we'll have to get together and swap moms. kzfaq.info/get/bejne/jpZ0mKyir9OYpoE.html

@HardKnoxAudio Жыл бұрын

@@RobotUnderground I watched that and it was my first time!! 🎉 jizz party

@glebgunin7364 2 ай бұрын

First man who explained for real how to do this with no bs. Liked subscribed . Thanks a lot

@Linkvision Жыл бұрын

On a little weed scale! LMAO

@paulgreene6899 Жыл бұрын

He Got me On that one there 🤭😊🤣🤣😂

@jasontimothywells9895 Жыл бұрын

Wizzle skizze my dizzle

@bassjasinski Жыл бұрын

Wheel weights work well and have really good adhesive if you know someone or work at a tire shop

@calvinevans8305 Жыл бұрын

What a good idea.

@RobotUnderground Жыл бұрын

Good eye. I forgot about those turds and the tire shop has a ton of them they save for lead recycle.

@skylierpurcell1549 Жыл бұрын

I used hockey pucks and a bolt to tune a diy 18 inch passive radiator once work great

@RobotUnderground Жыл бұрын

lol. Yep. Whatever's clever.

@remdawg4771 Жыл бұрын

Interesting. Always wondered how the passive radiators worked.

@hispls Жыл бұрын

You should be able to calculate mass with the help of your box modeling software easily enough by using your passive radiator's area as port area, finding the port length with your modelling software then multiplying port volume by the mass of air in that port. Passive radiator is just doing the job of whatever mass of air would be held and resonating in a port of that diameter at the appropriate length for your desired tuning.

@RobotUnderground Жыл бұрын

Thanks for the tips!

@calvinevans8305 Жыл бұрын

4:00 thanks for the knowledge, this is very interesting. Has anyone ever experimented with a powerful deep excursion subwoofer and deep excursion passive radiator? Will it just blow apart? I'm thinking the ported box always wins when it comes to output. I built a 2.4 cu ft slot port box for my RF T2 12 a long time ago. It had 3 inches of movement and would knock the rust loose on my poor little Toyota Corolla. Lol You couldn't smoke in that car with Bass Mechanic playing, it was disturb my breathing and choke me up. Lololol 🤣 I need to find another econobox and build another system. More smiles per mile on the way to work.

@RobotUnderground Жыл бұрын

Bigger than needed box will compromise power handling. Just keep that in mind.

@78schoolboy Жыл бұрын

We use a Clay type epoxy sometimes I will check the name and post it but it doesn't harden till you kneed it with the center which is a different color so you could keep adding the epoxy till the proper mass is met like Patrick said then activate the same clay/epoxy your using to tune and shpe it and stick it on the coil section of the PR

@dominikspencer3981 22 күн бұрын

PC-7

@cartycartyamplifiersalesrepair Жыл бұрын

Great video sir very educational 👍 👍

@RobotUnderground Жыл бұрын

Many many thanks

@feltZi 8 ай бұрын

Im building a wireless bluetooth speaker with dayton audio nd140-4 and it has vas of 7.22 liters and fs of 59hz and the box will have two dayton audio ND140-PR passive radiators, will do the tuning when i get the box fully done. I made the box bit too small, its only 5.4 liters and it has amp and battery taking bit of the volume too but i hope it sounds good enough for portable speaker

@narmale 5 ай бұрын

awwww i was hoping this was going to use the 5400 PRs... those things are sweet!!!!

@AwesomeBuford Жыл бұрын

After seeing this I think I want to try using a pair of passives with my Eclipse 88120 DVC subs. Currently they are in a dual sealed 1.25 cu ft enclosure powered by an Alpine PDX-1.1000. Patrick, I am local so I may stop by one of these weekends to pick up some items.

@RobotUnderground Жыл бұрын

Sounds great! I'm changing the hours on the Google page today. It'll be by appointment only from here on in. Text me with your name and I'll add you to my phone. 6023126504

@headkase11 Жыл бұрын

I'm glad I found this video. I have 6 budget 12's with 3 slap earthquake passive radiators. And Im making a video testing different weights. I have my weed scale ⚖️ lol . Did you ever try the slaps?

@RobotUnderground Жыл бұрын

I have resold a few. It's just a piece of MDF with foam on it.

@josephsaucedo8691 Жыл бұрын

Wow some one just asked about this on another you tube video and I told them that you would be the guy to talk to they were try to avoid parts express from what I gathered. Then some one brought up them needing to be turned you were the only person I know of that has all the parts and equipment I told them to look you up. Might as well just get a sub built at the same time ✌️👍👌💯🎶🍻🎶

@RobotUnderground Жыл бұрын

Text me with your name and shipping address and I'll add you to my phone. 6023126504

@Gone_X_ing 2 ай бұрын

Is it true that you only want a passive radiator horizontally so gravity does not affect the radiator's movement? I was gonna use it in an under seat enclosure for my truck...

@RobotUnderground 2 ай бұрын

No diff.

@joeymatthews8233 Жыл бұрын

I have a question and it's directed to home theater subwoofers... why do everybody insist on SVS Subwoofers over everything else like Velodyne , HSU , Rythmik or even the diy route with Dayton Ultimax subs , is svs that good or what's going on?

@RobotUnderground Жыл бұрын

Used to be a good value, now they're as pompous as all the rest. SVS used to be made by TC Sounds. Not that meant they were any better, but it was American made AND affordable. Save money, make your own ugly sub and then hide it.

@tonyzeno2715 11 ай бұрын

Once I know the FS of my Sub.. Do I want my Enclosure (Ported) tune to be lower or higher or equal to the FS? Sorry for the Noob Question.

@RobotUnderground 11 ай бұрын

It just depends on what the application of the sub is. The best thing you can do is play with a box program to experiment as a simulator. See what happens to the response when you change the tuning frequency and then see what happens when you change the box size relative to the Vas.

@dominikspencer3981 22 күн бұрын

Can a person use a single 15" radiator for a single 10" sub? Or is it overkill? If not, what about two 15" radiators with a single 10" sub?

@RobotUnderground 22 күн бұрын

Now I want to try those tacos that Sheri told me about.. lol. Yes, you can use a 15" PR or even two if you want. There's a difference between what is needed / required and what it is that you can actually get away with. You know this. I do however recommend a Sunfire cabinet of sorts for your orange beef with broccoli 10" sub I made you. I have one here if you want to mod it. I also have some of the original 10" passives from Sunfire / TC Sounds, or we can make a matching one for the driver and make sure the cap is off center again.

@drrckhamilton Жыл бұрын

I know that I'm pretty late to the game but any chance that you have any of these left?

@RobotUnderground Жыл бұрын

Yes. Just text me direct with your name and your shipping address 602-312-6504

@m3rk201 Жыл бұрын

Could you essentially "gut" a woofer and make it a passive radiator ?

@jasontimothywells9895 Жыл бұрын

HELL yeah you can ,

@RobotUnderground Жыл бұрын

Yes, you can even keep the magnet on there if you want. You just have to figure out how to add or subtract the mass to tune it.

@m3rk201 Жыл бұрын

@@RobotUnderground thats pretty awesome concept id love to try myself.

@chrismiller1503 Жыл бұрын

What sizes would I need for a duel 12 sealed box?

@RobotUnderground Жыл бұрын

Just text me direct with your name and shipping address. 6023126504

@SATANALEX9 Жыл бұрын

Robot Underground the most knowledgeable and honest person when it comes to car audio.I bet companies hate this guy finally someone with guts to tell truth about car audio.

@RobotUnderground Жыл бұрын

Only the corrupt ones hate me

@SATANALEX9 Жыл бұрын

Yes that's a good point.

@donmige81 Жыл бұрын

can 1 passive radiator work on a 2 subwoofer box or does it have to be 1 radiator for each woofer?

@RobotUnderground Жыл бұрын

You can, however you're going to max out that single PR pretty quick. You'd want it to be at least one size or two sizes larger. Like 2x 12's and a single high excursion 15" or 18" pr.

@michalwisniewski8033 Жыл бұрын

Old school audio engineer told me the passive radiator should be at least 1.5-2 times bigger than a woofer Perfect example is SuperCube6000 from Definitive Technology a 1000dolar sub with 9" woofer and 2x 10" passive radiator I love passive radiators sub since 20yers ago I had my first earthquake magma with passive radiator

@RobotUnderground Жыл бұрын

@@michalwisniewski8033 It depends on the size of the enclosure and the excursion of the passive. Smaller enclosure only needs one passive of equal or greater size. Especially if it has 2.5" or 3" excursion like the Sunfire TruSub by TC Sounds.

@michalwisniewski8033 Жыл бұрын

@RobotUnderground thanks for your message I lern something new Can you tell me your opinion about small "subwoofer" under 8" it's really Hype and popular on KZfaq now, brands like dyton audio or tang band Small speakers with long x max They play a quality bass or just making a noise and vibration in room? I don't have experience with them because subwoofer for me means 8" or bigger driver with low fs without eq or dsp boost Thanks and sorry for my English it's not my first language

@RobotUnderground Жыл бұрын

@@michalwisniewski8033 Only good for very small environments like a very small car and even then, you're probably better off with something that's an all in one. Like we have this sub for just $75 each shipped. amzn.to/3EC75BP

@janinapalmer8368 8 ай бұрын

Also the cone area of a PR should be larger than the driver cone area ...

@RobotUnderground 8 ай бұрын

It doesn't have to be if it has more excursion

@channelclosingastrollshave9447 8 ай бұрын

34hz shit 18hz good 👍

@MrCitizenKaned Жыл бұрын

Would you be able to get a lower tuning level by using a bigger radiator than the woofer or is the limit set by the fs/vas? Have one of the new alpine type r w12d2 but want to go lower than the 24hz but would still like the punch of a sealed box.

@RobotUnderground Жыл бұрын

You can achieve a lower tuning frequency simply by adding more mass to the passive radiator. Tuning too low can make it useless. Remember not to tune any lower than 30Hz for 99.9% of all applications. Ideal is 32 to 36hz to keep the system relatively efficient.

@caseytbss Жыл бұрын

Why would you want to go lower than 24hz? That’s way below Fs of that sub

@MrCitizenKaned Жыл бұрын

@@caseytbss Some of the music I listen to has content that drops that low and my subs at home drop to about 19hz which i like, in the car however i would say it does not even approach 30hz, this is much more likely to do with the dimensions of the car(Toyota Yaris/small hatch) than the box or the sub which is a 2 cuft ported, the subs at home are sealed 12s but they drop much lower or at least sound like they do in my room.

@SetchiPaunda Жыл бұрын

You still have 12s in stock?

@RobotUnderground Жыл бұрын

Yep. Are you in America?

@rickhayduke Жыл бұрын

How about wheel stick-on weights

@RobotUnderground Жыл бұрын

Yep. Those would work encapsulated in epoxy or resin.

@momar678 Жыл бұрын

Radiator needs 2x xmax of speaker correct?

@thomasnygard2334 Жыл бұрын

Sometimes, there is no real fixed rule. So If the sd cone area is the same than you would want more x max on the passive radiator. Most not all PR set ups tend to run a bigger PR(12 inch subs get a 15 PR) or two PRs equall to driver size but not always. It is something that you have to play with a bit on paper and in the box. It comes down to q,vas power handling, the amplifier you want to run (there are small but important differences class damping ect)x max, Fs and bl . There is no rule of thumb if you like how it sounds than its right. And PR set ups will need time alignment in some cases. Mostly have fun trial and error is learning. And that's the fun part

@momar678 Жыл бұрын

@@thomasnygard2334 just to pick your brain, do you go with the recommended ported box size or sealed box size for a passive radiator? I think he said ported in the video

@thomasnygard2334 Жыл бұрын

@@momar678 I run just below on my box but the ported size is right . Give or take 20%

@djrockon5729 Жыл бұрын

@@momar678 neither he said go with the VAS of the subwoofer you are using and work from there either adding or subtracting enclosure volume to suit your needs. If u were to go with ported that’s larger enclosure than the VAS because that’s not the subs resonant frequency the larger enclosure and port would dictate ur tuning period. Passive radiators are ports in sealed enclosures and sealed enclosures if built properly should compliment the subs resonant frequency then at that point u can get the proper mass to the passive radiator to get ur desired tuning…

@RobotUnderground Жыл бұрын

It helps. Remember though that a passive can move like 3" peak to peak with an 8" spider and 3" center. So even if you have an 8" spider and use a 2.5" center, you get even more excursion available as long as the surround can keep up.

@janinapalmer8368 8 ай бұрын

There's only one mistake you made when mounting the PR reversed like that ... and that is you have now increased the enclosure volume by the cone displacement... you need to know what this is and fit a block of wood or something with the same volume inside the enclosure. You can get false readings if you don't do this ..

@RobotUnderground 8 ай бұрын

You'll find it's not that big of a deal.

@sermac3246 Жыл бұрын

👍

@78schoolboy Жыл бұрын

BTW if yourusing these passive radiator on a night shade or a dc level5 or whatever you will need 2 per sub most likely also passive does offer a much narrower band width then a port so there is definitely some research todo before jumping . I am looking todo this soon earth quake makes a double radiator c Allen the pump that would probably work well for more extreme subs

@RobotUnderground Жыл бұрын

Not true. You just need a passive that can really move a bunch. If you're using a 10" spider and mega roll, you're fine. One way to keep it to a single PR is to keep the box small.

@RobotUnderground Жыл бұрын

You can also go up one or two sizes if you really feel the need. Like a 15" or 18" PR for the 12" active sub.