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

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29 окт 2022

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Комментарии : 89

@davej3487 4 месяца назад

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.

@glebgunin7364 2 месяца назад

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

@MF-vv9ky Год назад

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

@RobotUnderground Год назад

I'm glad I could help MoFo. Some day, we'll have to get together and swap moms. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-X0DeIqJm4vM.html

@HardKnoxAudio Год назад

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

@remdawg4771 Год назад

Interesting. Always wondered how the passive radiators worked.

@skylierpurcell1549 Год назад

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

@RobotUnderground Год назад

lol. Yep. Whatever's clever.

@bassjasinski Год назад

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

@calvinevans8305 Год назад

What a good idea.

@RobotUnderground Год назад

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

@narmale 6 месяцев назад

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

@hispls Год назад

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 Год назад

Thanks for the tips!

@cartycartyamplifiersalesrepair Год назад

Great video sir very educational 👍 👍

@RobotUnderground Год назад

Many many thanks

@Linkvision Год назад

On a little weed scale! LMAO

@paulgreene6899 Год назад

He Got me On that one there 🤭😊🤣🤣😂

@jasontimothywells9895 Год назад

Wizzle skizze my dizzle

@feltZi 8 месяцев назад

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

@SATANALEX9 Год назад

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 Год назад

Only the corrupt ones hate me

@SATANALEX9 Год назад

Yes that's a good point.

@calvinevans8305 Год назад

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 Год назад

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

@AwesomeBuford Год назад

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 Год назад

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

@josephsaucedo8691 Год назад

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 Год назад

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

@joeymatthews8233 Год назад

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 Год назад

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 месяцев назад

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 месяцев назад

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.

@78schoolboy Год назад

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 Месяц назад

PC-7

@headkase11 Год назад

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 Год назад

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

@chrismiller1503 Год назад

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

@RobotUnderground Год назад

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

@Gone_X_ing 2 месяца назад

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 месяца назад

No diff.

@dominikspencer3981 Месяц назад

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 Месяц назад

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.

@janinapalmer8368 9 месяцев назад

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

@RobotUnderground 9 месяцев назад

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

@rickhayduke Год назад

How about wheel stick-on weights

@RobotUnderground Год назад

Yep. Those would work encapsulated in epoxy or resin.

@m3rk201 Год назад

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

@jasontimothywells9895 Год назад

HELL yeah you can ,

@RobotUnderground Год назад

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 Год назад

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

@donmige81 Год назад

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

@RobotUnderground Год назад

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 Год назад

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 Год назад

@@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 Год назад

@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 RU-vid 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 Год назад

@@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

@drrckhamilton Год назад

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

@RobotUnderground Год назад

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

@MrCitizenKaned Год назад

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 Год назад

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 Год назад

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

@MrCitizenKaned Год назад

@@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.

@channelclosingastrollshave9447 8 месяцев назад

34hz shit 18hz good 👍

@SetchiPaunda Год назад

You still have 12s in stock?

@RobotUnderground Год назад

Yep. Are you in America?

@momar678 Год назад

Radiator needs 2x xmax of speaker correct?

@thomasnygard2334 Год назад

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 Год назад

@@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 Год назад

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

@djrockon5729 Год назад

@@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 Год назад

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.

@78schoolboy Год назад

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 Год назад

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 Год назад

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.

@sermac3246 Год назад

👍

@janinapalmer8368 9 месяцев назад

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 9 месяцев назад

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