How to build an IB manifold for 2 18" subwoofers in car

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Subwoofers used: Fi IB318v2
Infinite baffle application, subwoofers breathe to the outside of the car. so when the doors are shut, the car becomes the enclosure.
It results in the smoothest bass response with the lowest frequency extension you can imagine, playing down to single digit frequencies.
Other big benefit is sensitivity, hardly requires any power compared to conventional box setups.
You can find more info about the build here:
/ pssounddemoproject
/ pssounduk
/ audiblephysicsuk
Don't forget to check out my other videos and subscribe to stay tuned!
Thanks,
Peter

Опубликовано:

14 окт 2024

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Комментарии : 89

@wgreen340 Месяц назад

This is a great presentation on manifolds. I’ll be using same set up for 15” in a E38 BMW.

@wallheadkdir 10 месяцев назад

I am getting back into this game. HELLA late dope box. i know this video 5 YEARS OLD, but hey, game recognize game, man...

@pssound9749 10 месяцев назад

Ohh yes, this system changed the game for 1000s of caraudio SQ crazies! 😎🔊🔊

@SupermanwithaD 6 лет назад

This build is so freaking cool! I want to try something like this in the future with my vehicle. Thanks for taking us along for this project 👍🏻

@pssound9749 6 лет назад

There’s a lot more to come! ;)

@christopherkerr2254 11 месяцев назад

Ahh old school !!!!!!!bass boom bottom 😊😊😊😊😊😊😊 bass,bass, boom, boom bottom

@chriswray2132 6 лет назад

That looks awesome, great to see you working and explaining as you go, keep the videos coming peter !

@bassbimbisbimranger1889 6 лет назад

Hell yes FI audio represent. Can't wait too see what comes

@jeffbarton275 3 года назад

I love this whole concept. I'd love to do it to my truck. If I don't like it I can always patch it up I guess. I don't plan on selling it anyways

@chrisN80 2 года назад

Beautiful Pete

@wetdookie3808 2 года назад

I’m curious on the cutout size. Does the atmospheric hole need to be equal to the sd of both subs or can you get away with less?

@pssound9749 2 года назад

Min 50% of SD, that’s what you need.

@chaos7022 4 года назад

What do u meter? Love the build btw very unique

@pssound9749 4 года назад

Chaos 702 there is a video for that in the true IB playlist 💪👌

@Jeremydmeyer76 6 лет назад

Great video as usual Peter! I can't wait to see them powered up! Do you have anymore details on the membranes construction? Is it just steel mesh and foam?

@pssound9749 6 лет назад

i use this: www.bluearan.co.uk/index.php?id=JMS1581FFOAM&browsemode=manufacturer It's the same type of foam, you find on most outdoor PA speakers. It's sandwiched in between the steel frame and the mesh, simple.

@proffessasvids 6 лет назад

yes pete! merry christmas!

@pssound9749 6 лет назад

Merry Christmas! ;)

@abelscaliber7969 7 месяцев назад

Peter I understand the video is very old, but if you could give me some knowledge it would be much appreciated. I am brainstorming an IB build in a pick up truck. Does the area of the opening have to be greater than the cone area ? Or is there a rule of thumb to consider when trying to accomplish IB. My truck already has openings on the back of the cabin and if I can just build a thick enough baffle and bolt it to the back wall I’d rather just do that instead of cutting sheet metal. Thank you.

@pssound9749 7 месяцев назад

Rule of thumb is min 50% of cone area.

@audiogman5865 Год назад

Let me get this straight. Drive around and everyone outside can hear the loud bass. And if you drive it in the rain there’s a possibility of water getting inside where the subwoofer diaphragms are?

@explorinlearnindoing5462 4 года назад

Peter, I am curious, does this firing to outside sound much louder outside than a trunk to cabin IB? Because I want to use IB but I might not be able to do it to the cabin (not much room and hinges and a gastank), and I want it as silent as possible outside (maybe better stick with sealed box 😉, but its less fun)...

@pssound9749 4 года назад

Explorin, learnin & doing Funnily true IB is not louder outside! Very simple example: it’s very easy to excite the air inside of the cabin, which is let’s say 3000L/100cuft and create SPL inside of the cabin. On the other hand you have INFINITE air space outside, which is not easy to excite, just like in live sound, where they need many huge bass cabinets to produce SPL.

@explorinlearnindoing5462 4 года назад

@@pssound9749 Thats funny, I never thought of it like that... thanks 👍

@aaronmccann3246 6 лет назад

Looks great! I think I've seen something similar on DIYMA; or it may have been your build. How well do you think it would work with a similar design but have the manifold firing through the backseat/skipass area?

@pssound9749 6 лет назад

Hi Aaron, I’m not on Diyma, but somebody might have shared it there, not impossible. That can work too, but obviously the airspace of the trunk is limited, so needs careful driver selection.

@aaronmccann3246 6 лет назад

Pssound thanks for the answer! Considering the AE IB woofers or maybe a pair of Fi IBs.

@rawfilmsent540 6 лет назад

Aaron McCann recommend b&c subwoofers for this kind of setup

@crimboz2461 4 года назад

@@pssound9749 what driver do you recommend for about 100 dollars? For the skipass vent

@pssound9749 4 года назад

Crimboz New? Nothing! Fi IB3 is pretty much the cheapest option or Dayton has a range that maybe a touch cheaper.

@MiDnYTe25 6 лет назад

This looks really cool! I wonder why people put lots of money into ported and BP boxes when you can achieve more for less with this. I'd be intrigued to do something like this. How much power are we talking about here for decent levels? How sensitive is it for design accuracy?

@pssound9749 6 лет назад

I guess the sacrifice to cut the car puts many people off! It’s probably the most sensitive option you can have for low-end reproduction. The lower you go, the more sensitive it is and the less power it takes to get decent levels! I use ~ 300-400W under 20Hz to do 144-145dB levels, where it can do hairtricks! 😆

@freedblowfish3705 2 года назад

@@pssound9749 i think the sensitivity comment might have been reguarding to how getting the design slightly off will affect how it plays (eg: t-line subs being finnicky to build and usually needing adjustments after being built to get the exact planned results whereas sealed will give you similar results to what was planned as long as you are close enough, although it is really cool to know the sensitivity is high per watt. (Thats how i perceived the question anyways)

@3rdaxis649 5 лет назад

Fascinating. Where do you get this foam material from?

@b10-archive 6 лет назад

How high can these subwoofers play in this IB application? It seems you've implied they perform best in the sub 30hz region.

@pssound9749 6 лет назад

Watch this video please, you’ll get a detailed answer: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-K_i9Qncqmcs.html

@TheFreesabin 4 года назад

hi. how will 4 subs do in this instal ?? fi ib 18 inch .

@pssound9749 3 года назад

Cozma definitely very windy and car would fall to bits! 😃

@jamest.5001 6 лет назад

I'm new here. what is that an. a.p. membrane? how does that sound? what kind of frequency does it play at?

@pssound9749 6 лет назад

Hi James. It’s a true infinite baffle application in car. That foam at the bottom is to protect any moisture coming up from the road, which is not used anymore as there’s nothing coming up from the road at all and it’s in UK where it rains enough! 😃 Infinite baffle = IB is well know for the most effortless low-end bass production, where boxes can not even be compared to it. This setup is linear down to 12Hz!! Very sensitive, hardly needs any power. Accurate, fast, yet able to do crazy levels under 25Hz, where boxes struggle to play.

@elsey1976 5 лет назад

AP is aperiodic membrane. In my limited knowledge, Its a porous material placed on the face of the sub in order to control excursion.

@levrone0075 5 лет назад

@@pssound9749 Always loved the IB set up, as you say just effortless and the sub feels so free to play the transients so sharp. but is this technically a sealed setup as the subs are firing into a sealed space in the well and manifold? or is the sealed space large enough to mimic IB? seems too small for 2x18 to be classed IB? welcome your thoughts!!!

@pssound9749 5 лет назад

levrone007 I don’t get what sealed space you’re saying! On one side of the manifold you have the cabin of the car, on the other side you have the underside open airspace. The subs are breathing to the outside of the car. Did you watch the video all the way and listen to what was explained?

@levrone0075 5 лет назад

@@pssound9749 my bad i was skipping through. yes i see now the wheel well is open to the outside! never thought of this option before. Btw thank you for the reply i wasn't expecting it sorry it was a useless comment by me. ill make sure my next comment sparks a little more thought and discussion!!

@truckguy9413 5 лет назад

Could this be done in a truck where the triangle sub enclosure would be in the bed of the truck? Then vent it IB thru the floor and rear wall. You’d need an enclosure to go around the triangle as well. I’m not sure if the enclosure around the triangle would restrict the air flow too much.

@pssound9749 5 лет назад

Truck Guy It doesn’t make much sense to me by this description. If you have a wall separating the cabin from the bed, then just let the subs breathe into the cabin through the wall, dead simple.

@truckguy9413 5 лет назад

Pssound Thanks for the reply! I found the IB Facebook group and might post on there. It’s a mid size 4 door daily driver were the rear seats are really close to the rear wall. Plus a kid seat. I want to try IB because it doesn’t require a huge enclosure and it’s easy on the electrical but it might not work in my application. All I know is my 2 shallow 10s under the rear seat isn’t enough!

@NVMDSTEvil 4 года назад

@@truckguy9413 Yes, for a truck with limited space behind the seats it is typically best to vent into the cabin; the best shape depends on the size and number of subs used. Even in the case of a car such as in the video a vent through the back seat (center arm rest "hole" if it has one works great) or through the rear deck would increase cabin gain.

@jud-asinsmith-stansell2022 6 лет назад

so are these considered free air subs? Where you don't need a box but you just don't want to share the air space with the front with the rear?

@pssound9749 6 лет назад

Free air is when the front and the rear wave is not separated. In this case they are, so it’s infinite baffle.

@AllSoWavyReese Год назад

Isobaric ib setup?

@pssound9749 Год назад

No, the speakers are not sealed to each other, they both play the same way outside. As the title says, it’s a manifold.

@jamest.5001 6 лет назад

do the sub's act as free air or ported?I always went with sealed enclosures. is it loud outside?

@pssound9749 6 лет назад

Let’s say they act as free-air, but free-air and infinite baffle are 2 different things i don’t have to explain, google does it better! 😃 In my case once the car is shut, the interior of the car becomes the box and you sit inside of the box as such. It’s surprisingly quiet outside, especially when it’s only used in such a low frequency range. It’s easy to excite the air inside of the cabin, which is 3000L let’s say compared to the outside which is...infinite!

@jamest.5001 6 лет назад

Pssound thanks for the reply. o subbed to your channel . most ppl around here are SPL oriented. I like more sq. my systems always were large sub's In large sealed enclosures. back years ago. I'd say kicker solobaric was one of my favorite sub's. 15" . I have always had 12"-15"and 18" for low bass. I don't bother with anything smaller than a12", the qs of a 8" sub thrashing just isn't my thing. I'd rather have a decent 15" on 250watts. sorry for rambling. and thanks for the great videos!

@pssound9749 6 лет назад

You’re more than welcome to comment anytime, that’s what this surface is for and that’s what i always ask for! 😉

@mikkolaine4883 6 лет назад

That's funny. I've never been in to more than 12" subs :D I like to listen to metal so I need damn fast and kicking sub. Mostly 10" and some 8" models have been used in my car :P

@pssound9749 6 лет назад

Mikko I have 8”s in stereo upfront to cover the 35-100Hz range. These IB subs are for infra sub duties. This way you get the best of both world, kicks that punch through your chest and low end wobble that float your hair! 😃

@GalacticalAmbassador 4 года назад

How did you cut the hole in the car frame?

@pssound9749 4 года назад

Øne-Hit Disaster angle grinder? 😃 Then we welded in 2x 1/3” steel plate sandwiching the original floor.

@rts100x5 6 лет назад

to eliminate the manifold resonance - dont the drivers have to be completely perpendicular ?? ie these are about a 30 degree angle.....

@pssound9749 6 лет назад

Hi GLYNN! Under 35Hz where i use the subs there’s no resonance to worry about, plus what shape & angle the manifold has was done by physical limitations how the subs fit into the space of the car.

@rts100x5 6 лет назад

thanks . ya i thought they probably have to fit a particular physical space : ) thats why they aren't 180 degrees perpendicular ...nice build - wish I could cut out my floor board in mt truck for my subs.... I love IB sound of my new home theater sub Stereo Integrity IB24

@wtfngarage2082 2 года назад

think of doing this

@christianredbour3023 5 лет назад

i want to cut my car open like you what do i have to do???

@charlesmartin4363 6 лет назад

I mean what the hell happens when your windows are down dose it act like free air ?

@pssound9749 6 лет назад

Charles Martin No, the car becomes like a ported box and the low-end becomes very very windy! 😃 Check out some of the other videos, where it’s demoed!

@charlesmartin4363 6 лет назад

Pssound I did its pretty impressive in low frequency but how is the response in the 30-80 htz range

@charlesmartin4363 6 лет назад

I only saw video around 15 htz

@charlesmartin4363 6 лет назад

Does it react like a ported box or a bandpass

@pssound9749 6 лет назад

Charles Martin This car doesn’t support upper bass upfront from the trunk, no matter what, so this setup in the car has stereo 8”s playing above 35-40Hz and the rear does under, acting more like an infrasub. Check out this video where you can see test measurements too: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-K5yWXTFa42w.html