Building a 4" Transmission Line Subwoofer - by SoundBlab

This small transmission line subwoofer really hits beyond its weight! The driver is from Tang Band (W4-2089 4.5" RBM Mini Flat Panel Subwoofer 4 Ohm). It is a really easy build, and would be an ideal companion in the trunk of a car or for a small desktop speaker setup.
Suggest amplifier power: 80W (RMS)
High-pass filter: 35Hz, Low-pass filter: 160Hz
SketchUp files and a Parts List are available on my Patreon page ( / soundblab ) or later in the beginning of 2020 to KZbin membership via the Community tab on my channel (www.youtube.co....
PRODUCT PURCHASE LINKS:
- Tang Band W4-2089 4.5" RBM Mini Flat Panel Subwoofer 4 Ohm - (US) parts-express....
- 2.1 Amplifier - Dayton Audio DTA-2.1BT2 100W 2.1 Class D Bluetooth Amplifier with Sub Frequency Adjustment - (US) parts-express.... , (EU) bit.ly/3RzXQGT
- Nobsound G2 Subwoofer Amplifier 100W - amzn.to/2YCmXNP
- AIYIMA 300W Subwoofer Amplifier TPA3255 - amzn.to/2PEp4g1
- Half Ounce 24" x 24" Dacron/Batting - amzn.to/36rvkOY
- Parts Express Round Speaker Wire Terminal Cup 2-15/16" Gold Spring-Loaded - (US) parts-express.... , (EU) bit.ly/3Yrznpd
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Music: www.epidemicso...

[@maksheller6780]

Это изумительно пропорциональная и эстетичная вещь! Это говорит о том, что правильная техника всегда выглядит прекрасно, так как всё в ней направлено на функциональность, а не на броский дизайн, рассчитанный на широкого потребителя. Браво 100000000! Спасибо и всего наилучшего! Просто супер!

[@SoundBlab]

Thanks!

[@davidhart8835]

Very well done, I listened with a nice pair of headphones and it has an impressive range. Thank you for sharing!

[@SoundBlab]

Many thanks!

[@iblesbosuok]

My DIY TL sub measures 1½ feet wide, 4⅔ feet high and 2⅓ feet depth. Produces sound that propagate on floor. Real nice subsonic sound.

[@ArcticAudioResearch]

Once again a fine build. I always look forward to watching your videos, partly also because of your choice of music in your videos, which is always excellent! I always have a good time when watching your videos! Thanks!

[@SoundBlab]

Thanks so much!

[@akuncrazy]

boss, why is the port added a silencer? what is the function?

[@karmicmessenger]

Impressive. I would add a bit more stuffing to tighten it up a bit. I'm listening to it through my two 12" subs and I can't believe how low it goes.

[@growshadow2134]

Cool build. The actual science behind the build would make for alot more views. Id like to learn the port science.

[@SoundBlab]

Thanks

[@jlg23us]

would have been great to maybe use a di-pole driver to see how much audio spectrum you could cover with just that enclosure. Great build BTW, always enjoy watching your creative new projects.

[@jlg23us]

I should know better to watch how I say things. I understand what you're saying, and I understand the complexity of tuning transmission lines. Thank you for highlighting my failure in the english language.

[@yaghiyahbrenner8902]

nice build, just a tip for a box transmission, the port needs 45 degree angles at each turn (use wood), to guide the pressure wave used to prevent pressure bounce back into the t-line.

[@SoundBlab]

Thanks. I would not go so far as to say that it needs it, but it will surely help the flow of air. There are many highly regarded commercial designs out there that do not always implement this, and they seem to still function as intended. I get what you say though 🙂

[@AnnaVannieuwenhuyse]

Actually, the corner pieces are usually cut to the size to make the bend the same surface area as the line. An ideal corner piece would therefor me concave to keep the perfect surface area. :)

[@ArifKamaruzaman]

I would cover with grill of some sort. and maybe carpet the housing. Beautiful build.

[@SoundBlab]

TX

[@ellisrobinson]

I don't think this will be going in a car somehow 🤣

[@timschutte6924]

I love the tang band woofers. No other company makes them like they do. I'm gonna use the 5 1/4 inch subwoofer and a slightly larger box.

[@SoundBlab]

Cool

[@Rydex]

i really do appreciate those tang band subs, i used to have a z2300 but the amp died and then a few days ago i decided to build a new enclosure for it and it bangs. The sub that was used in the Z2300 is the Tang Band W8-670Q which is now fitted into a ~100Liter enclosure tuned to 30Hz which gives me a F3 of around 27Hz and a relatively flat respone

[@rezo786]

would really appreciate a video like this for a 10" or 12" subwoofer

[@SoundBlab]

Might be a very large enclosure, but I am also interested to do something like that. Maybe future video...

[@jamegumb7298]

@@SoundBlab I used a ceramic sewer pipe for a 25cm diameter woofer, 70ish cm high, 40cm total diameter. They need not be too large if you can make the material dead. Sewer pipes can be had here and there for bargains, unused, maybe where you are too? You could also optimise by floor size, I have another sewer pipe, but plastic (other materials too heavy), it is cheap, only 25cm total diameter, and comes in standard length of 5,5m. So, I cut it down to 2,40m exactly to me ceiling, now I need a way to put it upright and be stable enough. IIRC 90cm or so of 10cm reflex pipe will put me at up to 18Hz flat. Big pipes are easy and good. For subs anyway.

[@OlavAlexanderMjelde]

@@jamegumb7298 can you make that shaped as many S, so its more compact under a couch?

[@VTLIFE-so4dc]

T-Line boxes, by nature are not compact.

[@jamegumb7298]

@@OlavAlexanderMjelde Using a ceramic sewer pipe? Unlikely. Plastic sewerpipe? Probably if you have the connector pieces but no idea how that will affect the sound, sharp corners, and 25cm across still means a rather high couch. I optimized for least amount of floorspace, to just take in vertical space instead, not tiny size in general because it really is not.

[@josephfoster3819]

I can see that having a table saw making accurate cutting really easy . It's not so easy free hand with a circular saw

[@SoundBlab]

It does, but only if set up accurately. You can use a guide rail with the circular saw and still get very accurate cuts.

[@weareallbeingwatched4602]

@@SoundBlab you can also take a cut sheet to your timber merchant and they will pre-cut stock to size for you to an accuracy of plus minus a couple of mm, which can then be flush trimmed to final size with a router and a metal guide rail if you need absolutely hair-splitting accuracy.

[@ShawnPitman]

You can get some linear guides for a circular saw. Very effective! And cheap!

[@penttijakonen3817]

@@weareallbeingwatched4602 That's what I do. I'm not going to make things way harder for myself just to save pocket change.

[@UnstableAgenda]

I do wish I could get this Subwoofer in my part of the world! Shipping to NZ is a killer!

[@nacholibre9929]

the stuffing is at the beggining of the line

[@joeygonzo]

lol

[@andrewandrosow4797]

Good work! Frequency response from 55Hz-60Hz - I think so

[@Nico_Rinke_]

👍🏻 Good work as always ! From Germany 🇩🇪

[@SoundBlab]

Thank you!

[@Frambhueee]

@@SoundBlab you didn't take my design for a subwoofer 😢

[@gasoline7954]

6:58 im in love.

[@sherwingustilo9589]

What are the measurements of the box?

[@harwindsingh]

You should have covered the bottom air passage with black net.

[@Blackinterceptor999]

And use copper binding posts instead of a cup.

[@coztac1991]

Hi, I thought I'd mention that yo should loool up KZbin tricks for creators, if you get your video over 10mins it allows you to place more ads, say one in the middle one one right before the end and one at the end of the video, it should increase your revenue stream significantly and help you make better content or just support you more.

[@SoundBlab]

Thanks, I normally do, however it would have made this video just a tad too long and I ran out of suitable footage.

[@Boogerweldz]

Do it, you deserve it👍🏻just do more demo at the end or show a link to partexpress to eat up time?

[@plamenyanulov7179]

can you show as how its sound when is on the car ? :) love this small projects :)

[@hiknolph6166]

Good work Man. From BRAZIL

[@SoundBlab]

Tx

[@air1forcegrant1]

Made my first with some old tear down parts of old stuff, not as small, due to needed to be at least 12”x14”x and went with x 10 sidewall which placed ext. wall and act as side ports for surround acoustic with additional top ported tube. I have very minor knowledge on boxes or properly distributing sound. The 4” micro sub is in its own separate box within the box as sorta of a double boxed concept acting as a double semi compressed bass -air-per-cubic ft. Which i was iffy about. And only using 2 smaller 3inch full range audio speakers in front of box and i only designed 2 split sound walls to control the acoustic to ported sidewalls , which front to rear go 7 inches to back- once again i have no clue what i am doing , to know whats best. Lol just and idea of how i thought i wanted it to work with lil to no knowledge . Let me tell you something though. The quality of 300deg. Sound shocked more than just i ! They bass shakes whatever you did not know was loose in the house or area. The neighbor from 3rd floor , i do not even know , as i walked out to put into car before work to get some paint on it , asked if that was playing on and off last couple days? I replied yes as i was checking to see sub hertz range for 6-7 min. Each time. He replied -wth ! That is one bad*** loud box , it can shake somethings in here and i thought it was someones subs in a car. Lol -note these are very newly built solid and very quite apartments and that was the 3rd floor. My wife won’t even let me play it in the house . But i did noticed the 2” x1” side ports built in sidewalls were not enough and i thought would be too much or plenty for the small pre-boxes sub at base of box , but they were actually not enough i found out later on accident . So i ended up putting a flush port tube at the rear top of box and that increased bass and the bass quality of surround as the speakers were already. I think the reason for this was , that on the sidewalls i decided to close the side ported areas off box with audio mesh for a nice, clean look and it cut down on the air to be able to exit box as much as did before and compresses against self. So the ported tub on top helped not only get that back , but made it even better in all aspects. Never expected that lil sub to need so much air . Given its pre-box size is 12x14x3.75

[@lucilaaldabamaltos3254]

Cool 😎 subwoofer and sound

[@SoundBlab]

Thanks! 😃

[@lucilaaldabamaltos3254]

You'are welcome

[@johnviera3884]

I disagree with that stuffing. But you gotta respect any man with more than 3 routers.

[@user-vu5ks9ym4l]

Thank you for your knowledge Now my house is a movie theater. Because your speaker formula

[@SoundBlab]

Cool, thanks for watching!

[@rodmarkvalencia9329]

Small but sounds like a big sub. I like the sound quality of the bass.

[@juststuff5216]

Nice design!

[@SoundBlab]

Thanks!

[@juststuff5216]

@@SoundBlab I was going to say: 'Put it in your car and see how it performs.' Its a little monster of a thing.

[@georgem6359]

Hi there. I like all of your videos since you explain things in very easy terms to understand, particularly, for a newbie, like myself, and which has led me to start building my system from scratch. One of the things I'm planning to build is a Transmission Line enclosure. Got a question - let's say my target frequency were 35Hz using a driver with a frequency response of 44Hz - 22000Hz. So, 35Hz is below 44Hz. Will my T-Line enclosure be able to hit the target? Or I do I need to set a new target at a point no lower than the one part of the driver's frequency response? Is there any restriction aside from the length of the tunnel and its cross-sectional area? Can it be tuned for any given frequency regardless of the speakers frequency response? Regards and, please, never stop making videos.

[@SoundBlab]

Thanks man! It's difficult to say. It all depends on the driver specifications. You can go lower than the FS of the driver, but would not push it beyond 5 or 10 dB. The driver will run out of steam and you will get what we call a shelved response in the lower part of the frequency response. This transmission line calculator will help you to determine the ideal response: www.mh-audio.nl/Calculators/TML.html

[@georgem6359]

@@SoundBlab Thanks for the info and link. I'll jump to it right away

[@TheSakuraGumiLTD]

It's really flat in the responce, smooth and tight.... is there a video on small battery powered amps as I'm thinking of a portable system with a extra amp to power this when there space and time for the exta subwoofer... Intresting for live song making in the woods or on a mountain

[@CinemaWalls]

you did not get a maze, as the first spacer inside the case is useless - it does not isolate the space behind the speaker. It was necessary to do the struts obliquely.

[@jackmills5071]

In many t-lines the speaker is placed at an interval away from the start. Many are also heavily tapered. It's about resonance and standing waves. Think of a flute, the mouthpiece is places about 1/3 away from the top, but the entire chamber is still used for resonance.

[@ThatOneGuySometime]

I would incorporate that into a high efficiency Bluetooth boom box build.

[@doddgarger6806]

Nice build! I found a cordless brad gun at the pawn shop and I can't understand ever attempting to build a sub or any cabinet without one!

[@SoundBlab]

Yes, definitely one of my most used tools!

[@anandshah71]

Nice video if u can plan a slim hideaway sub so that the home minister doesn’t complain. Would be great. Also slim line array using Tang band sound modules

[@northerna4482]

Love this channel. So interesting watching a craftsman about his work. Subscribed. 👍

[@SoundBlab]

Thanks

[@miclairmiclair876]

@@SoundBlab what will happen if u put a bass radiator in front of the bass port

[@zodiacfml]

amazing bass for the size. my first DIY sub 15 years ago is a Sony 12inch, around 380wrms. It was too much and unwieldy, I'd be happy with this 4inch. 🥹

[@SoundBlab]

Thanks

[@LOGICALMAGNET]

it sounds so nice to my years, i use EASARS Headset

[@SoundBlab]

Thanks

[@IamR3D88]

Damn... there is a logo i have not seen in years! I'll still screw up and call amd cards ATI sometimes though

[@vernarddevilliers7899]

Impressive results

[@SoundBlab]

Thanks

[@kanhayadaw001]

Nice work sir

[@SoundBlab]

Tx

[@shakalg1]

Nice build, you should make one that fits in the spare tire compartment.

[@leongailberger7676]

shakalg1 not that hard...

[@SoundBlab]

Thanks!

[@bunnatang2081]

blocking air hole with this fiber foam is a mistake. try passive radiator or just free up the air way to make bass more punchy at low end.

[@joepme20]

That is not entirely true tho... Transmission line enclosures rely heavily on stuffing to absorb the 'higher' frenquencies. An unstuffed transmission line sounds quite rubbish tbh. Very undefined and unbalanced. I've tinkered quite a lot with these types of enclosures, and this is what I was able to conclude.

[@SlowSpyder]

Made my Z5500 10" sub go low, must sound decent..!

[@spoderman8911]

Hey soundblab! Your driver fs is 35hz. So the lenght of the port should be 96 inches to produce 35hz and the port should be continuous. But in your design the port length looks less than 50inch and is also not continuous.. can you please explain this?

[@SoundBlab]

Can't remember exactly what the line length ended up being, but often by playing around with the line length and placement of the driver, you can smooth out the response and get a similar result to a longer line.

[@abhi5690]

Bass is awesome 👍👍👍👍👍👍

[@SoundBlab]

Thanks

[@PDRIFT86]

That looks and sounds great! I love TangBand subs, i have 2 Tang Band W6-1139SIF 6-1/2 subs in my car and they sound good but i know they could sound better with the proper box. I know nothing of subwoofer box design, i just tried different box sizes and different slotted port lengths until i thought it sounded good. It would be nice if someone would design a box that i could make.

[@joshualong7517]

PDRIFT86 I just put those same speakers in a box in my truck. Somewhere around .35-.50 cubic feet per driver is sufficient and a 2" port that's 10" long will tune it to about 35 hz. I used a 2" PVC elbow for the opening and 2" pipe connected to it for an additional 6" to get the 10" line. I stuffed it moderately, with about 6oz of polyfill. Sounds 3x better than just having them in my doors.

[@lilrich1243]

You can check out WinISD From what I hear it's what most use for box building All you need is the specs of the speaker and the desired frequency, then input it into the program.

[@keitakahiro2409]

How many Vas liter this box . Sir? For 4 inch speaker

[@gurunathmandavkar3686]

4.59 l

[@ErenYeager53936]

That thing hits hard😯

[@edwinpn3457]

So interesting watching this video nice finish job

[@SoundBlab]

Thank you very much!

[@alfredocalimquim5242]

Can you please build a 2 inch t-line sub box?

[@KrisWebber]

Minimize screen to 50%

[@zamzammobiles]

nice sound quality

[@SoundBlab]

Thanks

[@josueagama8954]

Wow exelents sounds of woofer

[@SoundBlab]

Thanks

[@mujahidahmad7849]

Solid bass 💪

[@SoundBlab]

👊

[@DracolegacyOfficial]

im curious what the result would be if you took half the depth off from the box and shrunk the port spacing to 1/3 of its current measurement.

[@EazyRed]

suffer port noise

[@rokzavrl8411]

But dude this is perfect!!

[@SoundBlab]

Tx

[@__-fm5qv]

This looks great! Whats the f3 of this sub and how does the driver generally perform? I'm currently planning a build using this driver so I'd love to hear your thoughts!

[@SoundBlab]

Thanks. The driver does well in this enclosure, and can handle quite a bit of power. It really moves a lot of air. I have not yet measured the F3, but modelled should be in the range of 35Hz or 40Hz. Perhaps I'll do a follow up video in the new year where I can do this and show some more stats.

[@gerritstrydom9845]

Great video, i really enjoyed this!

[@SoundBlab]

Dankie 😊

[@Phynix72]

Please explain different types of subwoofers & how are they different from each other. Including me, many general consumers doesn't know about it.

[@SoundBlab]

I can perhaps do that in a future video.

[@coztac1991]

I second this idea

[@juststuff5216]

When you say - different types of subwoofer - do you mean the different types of types of subwoofer enclosures?

[@coztac1991]

@@juststuff5216 I'd say so, I mean I think most people know that ported = more bass less tight response and sealed means less spl but better for music. But I genuinely don't have a clue what different enclosure types do or even are 😅

[@MrThor71]

Keep it that way , Soundblab. Greetings from Costa Rica and feliz navidad.

[@SoundBlab]

Thanks!

[@sohandey212]

Very very nice

[@SoundBlab]

Thanks a lot

[@PssupplementreviewsbyPete]

Phase in t-line speakers is a trip. Should I first just make the enclosure and then add volume inside the case to unify the phase?

[@Shawn_Magara]

Yeah I want one of these for my car hook me up!

[@followthegrow108]

Why? It would have barely any bass. Just get a single ten with a big ported box for deep lows

[@followthegrow108]

@@jaanbanaan69 can you explain further, like how does box size and design affect bass

[@danwilliams9339]

@@jaanbanaan69 he's great too!!

[@sureshms2k16]

Simply superb

[@SoundBlab]

Thank you!

[@hardhead7056]

I have never seen the driver placed midway through the line section. Its always at the other end or farthest away from the port opening. Lengthwise. If that makes sense. It's odd like this. A Unicorn box.

[@dietershobbypakanal]

Good quality speaker but the pice is very hi for this little thing.. nice build

[@saviogregory2495]

Hi a suggestion, cover the reflex bass hole with a mesh.

[@banditboy6444]

Stunning build boet!

[@SoundBlab]

Thanks!

[@dougg1075]

Great color

[@SoundBlab]

Thanks

[@2869may]

Why is the sub not at the end of the line, instead of 2/3rds where one side of the line dead ends...?

[@harryh212]

Brilliant, love it!

[@SoundBlab]

Thanks

[@wilcar1972]

hello please can you put the measurements thanks a greeting

[@dreamdiction]

So you didn't want to spread the glue on the bonding surfaces so that some could soak into the wood before you added more to replace what had soaked into the wood? The transmission line appears to only be about one meter long which would tune the transmission line to 180hz which is too high for a woofer and much too high for a sub-woofer. Where is the frequency response graph to verify this strange design?

[@SoundBlab]

I'll do a video to explain the design soon.

[@user-wb1im5gr7l]

i have a 4inch 4ohm 20w woofer from an old cheap subwoofer which i don't know the ts parameters but it plays under 40hz well free air Can i still use this build? To prevent damage i'll just lower the gain on my amp Will this build work for me without knowing the ts parameters of my woofer if i dont play too loud?

[@samuelsalins8309]

Good job 🔊 🎶👌

[@SoundBlab]

Tx

[@rcwildman9255]

Curious on what it would sound like without the material in there

[@Cabeza492]

Maybe less "creamy"? :)

[@user-se8nh3yu1e]

Boomy, and probably less tight.

[@Thetwinmeister]

A full range TL design needs the stuffing to attenuate a dip in the midband, but a TL as a subwoofer with a lowpass filter doesn't need stuffing at all. In fact the stuffing has a side effect of attenuating the low end output. So it really shouldn't be there.

[@ZAProjects]

Great diy product build sir 😀👍🇧🇩

[@SoundBlab]

Thanks!

[@matthewmabasa3331]

Can you do a bandpass design?, I'm a bandpass fan

[@SoundBlab]

perhaps sometime in the future.

[@o0o-jd-o0o95]

no hole saw?? great job

[@SoundBlab]

If only a hole saw could drill a square hole ;)

[@jeremyknight8569]

Forgive my ignorance, I'm new to the music sound quality scene. What is the purpose of the white matting?

[@onze5107]

Jeremy Knight to reproduce bass frequencies clearer as the bass won’t echo as much and over all will just sound better 😀

[@sciphan]

Sound dampening. Is causes sound waves to travel more slowly in the enclosure which simulates having a larger enclosure.

[@edwingm8790]

Retro Style Boombox + Transmission Line Subwoofer. Sound demo on both, maybe?

[@SoundBlab]

The sound demos for these are separate videos. Go check on my channel for the vids.

[@timschutte6924]

Nice job

[@SoundBlab]

tx

[@RichMoore-tweakin7376]

This is an awesome little build. I'm familiar with T-line enclosures, but isn't the top chamber in this build redundant? It seems like the sub is installed in the middle of the line.

[@juststuff5216]

No - it's not redundant at all, actually, its pretty clever! Bose use a similar approach in their designs. www.diyaudio.com/forums/full-range/243483-improved-transmission-line-alignment.html And before one dismisses Bose, I've yet to hear anyone worth their weight criticize Bose for their engineering kzbin.info/www/bejne/eYvEg4SKaLepl9k .. actually, the engineering is pretty sound. What Bose don't do well is to then take that brilliant engineering and desecrate it using really bad, cheap drivers IMO.

[@DIYAudioGuy]

I was thinking the exact same thing. What is up with that?

[@SoundBlab]

Interesting post on the forum! And is exactly what I have done in this design.

[@RichMoore-tweakin7376]

@@SoundBlab very cool! So that chamber is probably tunable.. hmm. Thanks for the reply. Love your channel 👌😁👍

[@salvatorescafiri2203]

Yes I though the same when I first saw the position of the driver!!!!

[@audioelectronics542]

Great Work Bro.Keep it up.Please tell me box and port dimensions.

[@jecelynpecoy4742]

Song in 7:59

[@bacillus9]

What is the low end frequency response for this setup?

[@SoundBlab]

Around 40Hz doen at -3db I think. Did not measure, only modelled.

[@darshitdarji3217]

SoundBlab which software do you use to model and test such enclosure designs?

[@victorsupreme214]

@@darshitdarji3217 1:25

[@darshitdarji3217]

Victor Supreme Thanks but I could not hear that properly. Can you name it?

[@victorsupreme214]

@@darshitdarji3217 HornResp (Horn Response) www.hornresp.net/

[@penttijakonen3817]

What makes this a transmission line? To me this looks like a vented enclosure with a long folded port?

[@SoundBlab]

A vented enclosure typically has a large volume from which a port runs out, however here you do not have a large enclosure, it is essentially just a 'port' or thus TL. Moving the driver up and down that TL (within limits) you can fine tune the response.

[@penttijakonen3817]

@@SoundBlab That's true but you could also build a vented enclosure with a small volume and a lets say 60 inch long port to tune it very low.

[@SoundBlab]

That will then rather be called a mass-loaded transmission line for example rather than a ported enclosure.

[@poutine9434]

I love you.

[@SoundBlab]

Thank you 😳

[@AudioElectronicsChicago]

I love these videos!👍🏻

[@SoundBlab]

Thanks!

[@hersenskim]

Hey SoundBlab. Are you by any chance from South Africa? Your accent is why I'm asking

[@SoundBlab]

Yes

[@igortarassenko8990]

The lines are arranged in a weird way. One line is leading to the dead end where the driver should be. Am I mistaken?

[@chaeyoungshi]

Igor Tarassenko that’s for that the driver can create more pressure i think

[@SoundBlab]

Moving the driver up or down the line (within certain limits) will affect the frequency response and in certain cases reduce the required line length for a more optimal response.

[@williamweisert]

i wish i could build a custom enclosure for my 12 inch but i dont have those kinds of tools

[@roygriend5143]

Can you add weight to the passive radiator, because in 5 liter tuned to 30 hz you get flat responce from 30 to 80 hz.

[@TimFosterBRV]

The Tang Band W4-2089 isn't available on PartsExpress (200 min buy + 4 month lead-time). Is there another smallish driver 5-6" that has similar performance that you would recommend for a similar build (scaled up for a larger driver if necessary). Seems like most of the woofers in the 6" size have a frequency response starting at around 90Hz where the TB starts at 35Hz.

[@SoundBlab]

You can contact Tang Band directly and ask them if they can sell to you. tb-speaker.com/

[@sandeepkrishnan5105]

Is the polyfill really needed for a transmission line design?

[@SoundBlab]

Yes, it slows down the wave and helps smooth the FQ response in this case.

[@MCAES01]

are you using pneumatic air stapler or electric stapler

[@SoundBlab]

pneumatic

[@MCAES01]

thanks

[@user-en4fg5uk2h]

Please, give me dimensions of these project. Thank You!

[@hfe1833]

How it's sound?,looks similar with Bose accoustimas design

[@mrpedrodrodriguezsr7628]

A question for you: Do you build passive subwoofers by order ? How much will you charge with materials , different finishing and your labor? I like this one you built in this video but one in grey or silver and the other in dark brown ! What do you say ? ;)

[@SoundBlab]

Sorry, I do not do custom orders.

[@mrpedrodrodriguezsr7628]

@@SoundBlab Ok .I just have to ask. Keep the good stuff coming!

[@everythingbro4786]

This sounds amazing

[@SoundBlab]

tx

[@skaposento4327]

good. perfect project

[@SoundBlab]

Thanks!

[@mexicobienchingonelpibeque8668]

ESTUVIERA GENIAL , SI TAMBIEN LLEVARA DIY AMP CLASS D SUBWOOFER AMP