Passive Bass Radiator, How it works and how to make Enclosure

Passive Bass Radiator
What, Why and how.
A research grade video on passive radiator.
Click here to buy speakers with passive bass radiator:
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A speaker enclosure using a passive radiator (PR) usually contains an "active loudspeaker" (or main driver), and a passive radiator (also known as a "drone cone"). The active loudspeaker is a normal driver, and the passive radiator is of similar construction, but without a voice coil and magnet assembly. It is not attached to a voice coil or wired to an electrical circuit or power amplifier. Small[1][2] and Hurlburt[3] have published the results of research into the analysis and design of passive-radiator loudspeaker systems. The passive-radiator principle was identified as being particularly useful in compact systems where vent realization is difficult or impossible, but it can also be applied satisfactorily to larger systems.
A small computer speaker cabinet. The middle speaker is a real loudspeaker. The top and bottom cones are passive radiators.
In the same way as a ported loudspeaker, a passive radiator system uses the sound pressure otherwise trapped in the enclosure to excite a resonance that makes it easier for the speaker system to create the deepest pitches (e.g., basslines). The passive radiator resonates at a frequency determined by its mass and the springiness (compliance) of the air in the enclosure. It is tuned to the specific enclosure by varying its mass (e.g., by adding weight to the cone). Internal air pressure produced by movements of the active driver cone moves the passive radiator cone.[4] This resonance simultaneously reduces the amount that the woofer has to move.
Design considerations
Passive radiators are used instead of a reflex port for several reasons. In small-volume enclosures tuned to low frequencies, the length of the required port becomes very large.[5] They are also used to reduce or eliminate the objectionable noises of port turbulence and compressive flow caused by high-velocity airflow in small ports. In addition, ports have pipe resonances that can produce undesirable effects on the frequency response. To a first-order approximation, the passive radiator works identically to a port.[6]
Passive radiators are tuned by mass variations (Mmp), changing the way that they interact with the compliance of the air in the box. The weight of the cone of the passive radiator should be approximately equivalent to the mass of the air that would have filled the port which might have been used for that design. If the passive radiator's acoustic mass equals that of the port, and the PR's compliance is negligible, then the frequency response behaviour of these two types of systems will be virtually identical.[6]
Although the frequency response of a passive radiator will be similar to that of a ported cabinet, the system low-frequency roll-off will be slightly steeper (5th-order rather than 4th-order), due to a notch (dip) in the frequency response caused by the Vap (compliance or stiffness) of the passive radiator. This notch occurs at the PR's free-air resonant frequency and causes slightly poorer transient response. Despite this, perhaps due to the lack of vent turbulence and vent pipe resonances, some listeners prefer the sound of PRs to reflex ports. PR speakers are only slightly more complex to design and are generally more expensive as compared to standard bass reflex enclosures.
Applications
Passive radiators are used in Bluetooth speakers, home stereo speakers, subwoofer cabinets and car audio speaker systems, particularly in cases where there is not enough space for a port or vent system. While most studio monitor speakers are either ported bass reflex designs, or closed-back without a vent or passive radiator, Mackie's HR824 and HR624 monitor speakers have a passive radiator installed on the rear of the cabinet. Focal also sells a studio monitor with a passive radiator called the SM9.
Respective examples of a smart speaker and a portable Bluetooth Speaker utilizing passive radiators are Apple's HomePod mini and Ultimate Ears' UE Boom.

[@aravindpandey2283]

Sir I must admire you for your deep knowledge,I am a speaker mechanic by profession,I have learnt a lot from you , Thankyou is a very small word

[@hiteshghazal]

बहुत खूब सुधीर जी 👌🙏💐

[@valdimirputin1335]

You're one humble, technically qualified teacher

[@abishekvk6893]

Thank you very much sir for such a clear insightful explanation. The difference is very apparent when someone really knows what they talking about.

[@NOOBstar_YT]

Jo video mein sahtata bohi video ajj apne dahla thankyou sir❤❤❤❤KZbin mei koi bhi accha se bataya nhi ta.

[@technicalsurajkumar199]

nice 👍 video sir g aap itna ache se samjate ho ki, audio equipment k company wale bhi itna nai batate 😁 aap k liye bahot sara like 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

[@rajshekharv.pandit6230]

आम टेक्नोक्रेट्स / टेकनीशियन्स के लिए नई जानकारी। बहुत बहुत धन्यवाद। 👌🏻👌🏻👍👍🙏💐

[@sharat.achary]

Thank you for such a detailed and prompt explanation.

[@maheshshukla5964]

बहुत सुंदर और उपयोगी जानकारी,आप सदा स्वस्थ और प्रसन्न रहें

[@defaultuser15953]

OMG exactly what i want thank you sir :D

[@Neo_jr]

Sirji, bahot dino baad, firse badhiya sa informative vdo laye...iske liye bahot bahot sukriya 😊. Par dikkat wali baat ye hay ke.. dhang ka koi passive radiator hi nehi milta..😔 Lekin, aap jo topic aaj laye hain, uske liye bada wala like, sirji😇

[@mytighgak4830]

so simple explanation. great work sir.

[@talenthunt123]

Best topic h ye

[@yatinsharma2794]

Hello sir, as you have so much knowledge in this field. I would request you to make videos on power amplifiers(very high wattage), live program set up, dj set up, speaker placement, speaker wattage required to cover different areas, different voice coil size speakers, speaker and amplifier comparision and so on.

[@adityachatterjee4498]

Very much informative 👍

[@tsk8400]

Sir app scientist hooo

[@tarunsinghrawat1916]

I Am your big fan sir

[@chandrasekharmukunda9236]

Wonderful vedio ❤

[@vijaybhatt9638]

Superb informative video boss 👌👌👌👌

[@shamimahmad3857]

Excellent video Bhai,

[@induvishwakarma8962]

Sir mere pss ek oval speaker hai 10 watt ka uska lenth 4 inch aur hight 1 inch hai to mai iska Bluetooth speaker bana rha hu to iske liye mai oval shape ka hi passive bass radiator use karu ki circle wala use karu aur kitne inch ka use karu plz bataiye

[@anantaankure3838]

Good morning sir

[@manishgedam]

Very nicely explained

[@mindaelectronics]

Good Paji 👍

[@Randomthoughts944]

The taste of a passive reflex setup is not good if you prefer clean music. Its like extra boom with no reason and fake bass. I have a JBL charge 3 but didn't know technical reasons why I hate it. Thanks for this video now understand the technical aspects of it.

[@sudiptasen6181]

Sir, First I wish to give you thanks for your intuitive video. I was inspired by your video to design a 4" subwoofer box. Unfortunately I did not find T/S parameter of 4" - 30 watt subwoofer from anywhere except the website of Sweton speaker. But the outcome results from AJ SEALED DESIGNER software with 4" Sweton subwoofer T/S parameter are coming abnormal (Vb is negetive!) Sweton 4" subwoofer TSP: Fs - 106 Hz Qes - 2.89 Qts - 1.83 Vas - 1.12 lt Please help me to sucess my project. Thank you 🙏

[@WhatIThink]

If Qts is more than 1 , Aj designer will not give proper results

[@sudiptasen6181]

@@WhatIThink Then sir what to do in that case? I cannot go for a higher speaker size/spec. for other reasons. Then How to get an approximate box size for speakers having Qts more than 1 ?

[@rs-view8571]

Sir ji , please make one detail video how to read any datasheet. This will help in learning. Thanks in advance.

[@sselectricalmagic5236]

Good information sir ji

[@maniksalfi2398]

Hello SIR, Can you make a video on GROUND LOOP ISOLATOR circuits, AUDIO TRANSFORMERS. Varieties of Market devices & modules. And connection diagram. By the way Thanks for this informative video.

[@uttpalkant]

#whatithink nice information sir 🙏❤️ Sir ek microphone kit pe video banaye jis me song ke sath mic kaam kare

[@tapasghosh1237]

Thank you for information

[@arraundale]

Good info

[@6.ai.9]

Sir aajkal market me dvc speaker araha hai Uska use ke bare me bataye or dvc ka waring ve bataye

[@TrozenTPlayzZz]

(🇮🇳) Thank you sir 🥰

[@talenthunt123]

Sir ye meine 8" woofer enclosure me use Kiya tha bahut badhiya bass deta h ye aisa lagta h ki 8'" ka woofer apne se bade woofer ki bass produce kar raha hai

[@dushyantpathak5564]

Sir hnh cart par milta hai passive radiator saste main Maine bhi 4 piece liya tha lekin data sheet nahi hai

[@aravindpandey2283]

Please make video on bluetooth transmitter,As i want to diy sound bar and subwoofer

[@musicmagic1991]

Thanks sir . Sir sinilink app me jo volume hei wo full nehi ho raha hai . Pps help me sir . Or ak sir , maine ak encloser design dekha channel 'bungdho projects -diy active subwoofer 8" cello w8xl ' . Sir isme local 8"subwoofer achcha kam karega iya nehi . Sirf yes no bataye sir pls . Or sir sinilink

[@musicmagic1991]

Sir wo design achcha laga mujhe

[@ManojKumarMittal-w2j]

Sir kya dooge sound Twitter bina box ke bhi satellite speakers ke sath attch ho sakte hai Please reply

[@vekariyaunnatijitubhai6029]

sir pipe ke uper radiator laga sakte hai pipe me rat aneka problem sold ho

[@shibi1010]

Super

[@jcsudeshchannel8224]

Sir good

[@pranoy.sarkar]

Sir, it's just the info I was in need for my new project. I bought pairs of 1", 2" & 3" Passive Radiator for my small speaker design from ebay. But, the Theile parameters were not available...

[@WhatIThink]

use speakers which have half cone area than passive radiator.

[@rahimaqaiser6232]

sir how can we make low pass filter which can be operated on singke supply .Kindly sir make the vedio about the this , I'll be very thankfull to you for this act of kindness

[@ummedkhan4466]

Sir ek video speeker par banavo. Magnet 🧲 se speeker vollum par kya prbhaw padta h. Magnet 🧲 kitme parkar ki hoti h Coil se kya prbhaw padega. As topic par KZbin par koi video nahi h. Please sir. Me aapke sare videos dekhata hu

[@mirajhusein5207]

Good job nice to you

[@bhubandas5333]

Sir. Pmpo uska upar ek video banaye.

[@everythingtechnical786]

Bhai polypropylene materials kaise kaha mile ga reply please

[@animeshmanhasiya260]

Nice sir

[@souravgope3196]

Hello sir, I've made a simple bt speaker eith pam8403 and and a small board only bt receiver. How do I get rid of the ground loop noise that's constantly humming in the speaker. I've attached both the ground (audio signal and power source) with the amplifier

[@WhatIThink]

Do not connect BT ground with amplifier ground.

[@agastya2511]

Hii can you make one video with DSO oscilloscope how can we use DSO for amplifier reparing.

[@avtarsinghbobby9395]

Thnx.sir g 🙏

[@Siddharth_Mauryaa]

Sir ji badhiya speaker driver kaha se karide ek video banaye please

[@rishbhchaursiya]

Sir Bia acoustics ke pass passive radiator mil jayega unki contact details Amazon se mil jayegi

[@utube9598]

Sir, mai tpa 8610 amplifier board se ek Bluetooth speaker banaya hai. But usme humming aa raha hai. Aur bohot patla awaj mil raha hai. Bass nehi araha hai. 2 inch ka do woofers lagaya hai. Solution boliye please

[@prkurre7466]

Hii sir 🙏 ek hi BT module se stereo pre amp our low pass filter kit ko connect karne ke liye ek video banaye.

[@harisrajtimaniya8810]

Sir...mere pas 2sb 1503 2sd 2276 ka board he or ye transistor jal gaye hen ...kiya me iski jaga 5200 or 1943 laga sakta hoon ????

[@AritraBose908]

Bhi please tda2050 4.1 board ki unboxing and detail video banayo

[@bhubandas5333]

Sir. Spdif kya hein.

[@surajitdas-qx5vb]

Bhaiya mera ek sawal hai. Agar 2 speaker 50 watt ka series me connect karen to uska wattage kitna hoga? 100 watt hoga ya 50 watt ya 25 watt?? Reply please!

[@Thedarkwebgiant]

Zeus Audios bech raha hai bass Radiators bohot acche price pe, maine bhi 2 pair liye hain

[@raushanjha8149]

Sir mere pas Sony ka party speaker hai v72d jiska amplifier khrab ho gaya hai. Abhi passive hai to iske liye koi achha borad btaye Driver size hai 5inch 2mid 2inch 2twetor 12inch woofar 1 jisme 135 ya 148ki magnet hai singel

[@WhatIThink]

Pahle jo amp laga tha uski jitni power hai uske hisaab se new amplifier choose kijiye

[@raushanjha8149]

@@WhatIThink sir pehle class d lga tha sony ka pta ni chlta kon ic use krti hai company

[@raushanjha8149]

@@WhatIThink mujhe lgta hai total 200rms ka tha

[@tsgtushar7980]

Hallo bhai i need your help pls

[@A2Aelectronic]

❤❤❤❤

[@Amityagi1]

Sir plz sound king SK Tuner ka bhi review video baney.

[@mdshafi5914]

Hii boss such me aap boss hai.. mai p/a system ka professional kam karta hu . pls mujhe koi oscilloscope with wattmeter lena hai pls sir iske bare me kuch bataye.

[@lohagarhmusicstudio]

Hello, aapse contact kaise kar sakte hain ???

[@sunil_ultra]

I have a Question sir do the class D amplifier Emi (Electro magnetic interface) Is Dangerous for health...?

[@deepukumardeepu4523]

Good👍 sij jj

[@shuvendupattari8079]

🔥🔥

[@Somesh-Ji]

Pls try Dayton Audio.... You can even get 12inch passive sub. All TS parameters of every single drive are present. I would love to see your experience of importing from Dayton Audio.

[@abhikdutta1842]

Where to buy passive radiators 2 inch online in india , pls help

[@WhatIThink]

big radiators are not available in India

[@VIPINSAINI_20]

Indeed they are difficult to get locally

[@nearchd504]

Make your own passive radiator , just buy the basket , cone , spider and with a spider put a bolt, washer , and a few nuts which can be added to this bolt to tune the radiator.

[@GayanProdip]

Amazon pe milega

[@sachinrout2159]

Branded speaker, subwoofer milta hai

[@talenthunt123]

Ji sir mene bahut dekha h

[@deepjoydas2630]

4" size you get in Amazon website

[@ramlaxman6386]

Kaise hai ❤

[@abyabhay4105]

Sir,please make a video on smps/tranformer + battery circuit for class D amplifier board,with rechargable circuit plzzz,so that whenever there is electricity we can use smps/transformer to power it and whenever there is no electricity we can run amplifier using battery.just like old radio,plzz do a video on that plzz.

[@melophile04]

Poori physics revise kra di isne bhai 😆

[@thebeatproducer7144]

Please anyone tell me that can i use LM 386(1 watt amplifier) module as guitar preamplifier, to give input to my PAM8610 amplifier

[@Teja295]

Sir video bana do ispe video plzz

[@praveenbanarase3052]

Dada...हमारे मार्केट मे passive rediator नहीं मिलता और उनको ये पता भी नहीं है तो क्या करना

[@soyabean4362]

Bhai mai bana leta hu achi quality ke passive radiators jo size me bolo vo size me bana dunga

[@Bikram0805]

HnCart pr 100rs me available h

[@jppj1231]

Jai ho aapki

[@karasangami9379]

👌👌👌👌👌

[@NANDIMURIWALA]

Sir passive bass radiator kaise banaye ?

[@RamKumar-oi9sm]

Sir may bahut pahele kaam karta tha mayne kaam ko chod diya fir bhi may kaam me dil chaspi rahti hay sheekhne ke gyaan kabhi bura nahi hota sir may aap se baat karnaa chahta hun

[@Hooow410]

Ask your local speaker manufacturers to make passive radiator for you . Just tell all the parameters you need in your radiator .

[@s.b.birdcare1117]

XY-T100L 100Wx2 APP Control Bluetooth 5.0 Subwoofer Amplifier Board High Power Audio Stereo Amplifier Board AUX USB Bass Treble Rs. 1,499.00 Isss board ki review dijiye sir...plzzzz

[@AlpeshPancholi]

👌👍👏

[@MundaToons]

Hello sir

[@Budho8434]

4:23 zebronics s990 speaker i have

[@mohammadmunif1598]

Great sir. Very informative.sir koe souraund sound with sub woofer ka bhi board aata hai. D class me . Plz info.

[@darkshadowff5051]

Hnh Card website passive radiator mil raha hai

[@Rajkumarsingh..]

sir ek aacha trainsistor amplifier design kigyeye jisme minimum distortion ho or sir aap ka video smps ke uper bhi chahiye ,jaise ki single supply ko dual supply me kaise kare jo ki lm3886 or tda7294 jaise ic me use kiya ja sake please 🙏

[@Amityagi1]

For passive radiator Electrocart Diyaudiocart

[@siddharthsharma91]

Ye speakers ke parde fat gaye baad naya hi dalna padta hai ye milte hi nai hai sabse bada drawback iska

[@aalamp7315]

Sar ji aapane Jo hundred word emplifier banaya tha vah mere ko banakar do

[@creativeind2940]

Passive readiator milta nahi hai