How is it possible that you get into such complicated stuff on your channel, explain it so in depth and professional , and the views are so low ? This channel should be on top of the youtube audio channels pyramid !

The presentation level on this is insane. When you darkened some fs parameters to show off how other ones are linked and when you overlayed the frequency response of the single sub with the series/parallel subs by using a dotted line for the contrasting subs. Good stuff, really appreciated.

I've been building speakers for 30+ years now, and this is the easiest, most concise explanation I've ever seen.

I spent 30+ years in mobile audio and I've never heard anyone speak audio from a design engineer perspective. I could listen to you explain this tupe of stuff for hours.

Your graphics are some of the best I've seen. Super clean and informative.

Holy crap, this just cleared up years of 'wtf?' about iso loadings. You drop such tight videos full of solid, practical knowledge for anybody messing with speaker design. Thanks for all the work!

You have the best explanation on isobaric enclosure, nobody do isobaric enclosure anymore after the 80's.

Man you're English is better than most native English speakers where I am for real!!!!! Best video I've seen yet and makes me want to build another ISO group ✅

Everything is interesting if you get into it deeply enough. - Feynman Sub!

If I recall correctly, when I had *FOUR 12's* in an isobaric box (i.e., clam shell setup)... ...I hooked up both subwoofers inside the box with reverse polarity (i.e., positive to negative, and negative to positive) and the two subwoofers outside the box with normal polarity (i.e., positive to positive, and negative to negative) when bolting the subwoofers face to face (with a 3/4" wood ring in between the subs that I prefabbed myself) . In this configuration, they all worked together as a team and had a lot higher dB gain from 20Hz-60Hz running at 2ft³ per chamber for each pair (as it had a divider in the Dual 12" 4ft³ net volume box).

Huge respect man! The things that you know about sound and how to engineer everything from scratch... I guess you dedicated your teenage to go through the nooks and cranys of how things work... Aaand, here we are! Learning things everyday!

Can we get a video from you on TS parameters? You're quite good an explaining things and I'd like your take on the various parameters from your perspective and in a practical sense.

Just noticing... how does Pete not have well north of 100K subs? This guy is brilliant and his videos are pro grade.

I know this is an old video but I don't care. I just wanted to say that I didn't understand anything you said. Not because of you, but because of my lack of knowledge in this field. I think I may have a new hobby thanks to you.

idk how i stumbled on this but i'm sure i'm glad i did. fantastic.

Sooooo much detailed information! Also so glad to see you collaborate with Wilston Audio & Hifi Vega!!!

Now I have to figure out the math on if the two woofers mounted in series were wired in parallel. Thanks for the video!

The technical level of this video is off the charts! Thank you!

Just earlier today I was wondering about isobaric loadings, what impeccable timing!

Thanks Peter for your videos and talent! You got me back into stereos after 20 years!

I wish I had people like you thru out my schooling clean crisp clear

12 volt guys got me over here and I'm glad they did keep up the good work brother.

This man is extremely great at what he does . Such a privilege to be a huge fan of yours. Great work very professional very educational.

You touched on something at 6:20 that I tried to search a while back when I started to design a smallish tapped horn. You stated: "...as long as the mounting depth of the drivers doesn't exceed the the internal clearance". One of the biggest concerns I had with my design was the lack of room the driver had around it. I wasn't able to find any info about how much is room is actually needed behind the driver, so I decided to change the design slightly to give it a tad more space. Most tapped horns I found online are huge and the driver sits almost at the mouth of the horn, many times in a steep angle and the mouth is huge as well, so it's hardly an issue. In my build, a 6,5" driver is around 50cm deep inside the horn. Width of the horn is pretty tight fit, at around 7" and there's not that much room between the magnet and the outer wall. Making it any smaller seemed ludicrous. I just got it finished (still need to paint it) and I have tested it briefly and it is quite something in a small flat :D Need to find the time to set it up properly. Anyways, I was wondering if you knew any limits or have ever come across issues with too tight clearance in a tapped horn? What would even happen if it was or can it be? I have hard time trying to thing what actually happens if it was. If you have any ideas, I'd love to hear them. Love the channel. Lot of really well laid out info!

Yes, back in 92 I set up four fosgate series 1 twelves in a ported box in an isobaric configuration. Punch 150HD in stereo mode at two ohm per channel. Vehicle was a 1988 ford escort. Very small box in the hatch. Mcm goldline doors, rears and tweets ran off a Kenwood 920or 921,can't remember. It was a very impressive sounding set up. LA sound crossover. Kenwood head unit.

The best speaker channel on KZfaq, hands down.

“Twice the (Moving) Mass, Half the Vas” was a term I coined as a teenager in the 1990s when Isobaric made sense because manufacturers weren’t making drivers for smaller enclosures.

Have used this with very tight musical effect, but never thought of doing this in a transmission line. Thanks.

good explaination and I like the fact that you don't do like most utuber and take 20 minutes to explain stuf that can be done in 7 minutes. good job

It is so refreshing to hear such useful knowledge. Thanks!

Steve Irby challenged his engineers to create a single woofer with the TS parameters of two woofers in isobaric config, and the Solobaric was born. very cool design, not seen much anymore

BigD. brought me here to this channel! Cool channel indeed!

148 Dislike ?!?! WTF ?! WHY ?? Crazy people ! THIS IS THE KIND OF THE BEST EVER GUIDE for all of us ( beginners or experts ).

I freakin love this channel. I became a fan when youtube suggested the 3" 3D printed subwoofer enclosure video and have been watching and liking ever since. Cheers!

Just found your channel today. So much great information that no one else seems to cover. Would love to see you do a video where you go through the design process for a scenario(or two!). From driver selection to enclosure design (like what order and the process of making that decision). Something like a home theater subwoofer, music subwoofer, or car audio subwoofer with of course some specific design criteria like space, extension, output, etc. Keep it coming!

Amazing to finally see someone dig into the maths, usually we see theory and then finished product, great job

This video saved my two 18s in a Fiesta project :-) Thanks!!!

Good to see you getting back onto the acoustics subject, it's quality content, and your grasp of the subject is genuine.

Why would anyone give thumbs down to this video is beyond me..

My enclosure was made because of this video ! 4 VFL 6.5 in isobaric 6th order on taramp 5000.1MD@2ohms

Finally! Someone explaining the good stuff!

Was at a car show.....when ORIAN was on there top game. About 20yrs ago....lol. there was an ORIAN booth with a 90 something Toyota pickup with the extra cab and it had 10 10's in an isobaric configuration. That shit banged so dam hard. Never forget that build!!

Back in the 90's I had a Thunderbird with 8 kicker 8" iso. It had the low end of a 12" with the tightness of a 6" or 8" with plenty of volume. I was running 8 ohm subs all parallel off of a PPI pro mos 12. The box total was only 2.4 cf. Back then that was small and loud!! I loved building new boxes to try out. Learned a lot and if this channel was around then I would have saved a lot of headaches. Awesome job and thanks.

I learn’t a lot from this, mostly the fact that i don’t know anything. Good vid 👍

Your amount of knowledge is awesome. Thanks for sharing it with us with these videos.

Could've explained it any better myself excellent good video topic of discussion you're one of the more knowledgeable basshead's I know 👍

If you really care about audio and the science behind it. This guy's videos are the best I've seen.

I knew all of these results, but had no idea WHY the results actually happened the way they did. Awesome video, thanks!

Thank you for a very clear and informative video. I've been curious about the physics involved in isobarics for a long time. In this short presentation, you accelerated my learning curve to near vertical.

Holy crap you just blew my mind for how to do my next transmission line for my home theater!

Yes this is a very good channel

Great stuff. Always looking for the next video. Wish some of the old guess the size vids were still there.

I started watching this channel a couple weeks ago; and i can say i am happy i subscribed.

Thank fuck someone who actually knows what they're talking about.

I'm literally in the process of modeling an isobaric front loaded horn. What a coincidence.

Always appreciate you for taking the time to break things down. Keep up the good work

This channel deserves way more views

the12volt is an amazing tool. so glad its still around, i use to use them 10 years ago when i was into cars a lot!

Back in the late 80’s I experimented with a parallel setup once. Two Magnavox 8” woofers and original enclosure of one speaker. I guessed at opening of port ( just removed material from front baffle. Barely heard anything but made everything upstairs shake.Was in corner firing up.

Great delivery of very complex audio and electrical facts! Have recommended your channel to many audio engineering students. Keep up the good work :)

I like the frequency curve on that graph of the isobaric set-up. Now to figure out how i can do this with two giant 18" woofers in my little car. I got it in my head, but achieving it in person is another story. 😄👍👍

Yep, you know when a guy speaks with authority on his chosen topic.

Once again Mr. Wizard has blown my mind. 🤯. Great video! Keep up the good work!!!! 👍

I had an isobaric enclosure. One sub blew. I had a passive radiator in shop. So just to see what it would sound like I used it instead of second subwoofer I used it. It really surprised me and was louder than before

Nicely explained Pete, but it would have been nice to have the two direct radiating woofers also shown in parallel wiring as well xx

Very well done Pete. Learned some things I didnt know. Cheers!

A buddy of mine has 6 10inch MMATTs pro audio and it’s ran iso baric, the bass is ridiculous!

I love how you explain everything.

Always been a big fan of isobaric, great presentation!

Such a good explanation that even I could understand it. The diagrams helped too. Nice job!

Thank you so much for this video. This mostly helped me work with parameters when you have two woofers in series. I couldn’t figure out the formula to change the parameters and this is laid out very easily.

I wish I was your neighbor u would never get a break from all the questions or projects

Man, i try my hardest to follow along but yeah. Awsome info

I love Hexi’s vids... been watching since the early days of him in his shop way back making boxes for customers coming from all over... seeing the design, the build process and even the fit and sometimes listen/measuring session.... al’a that crazy 4/12 confit in that Escalade/Chevy style big SUV he did I liked so much. To some they would probably want some laymen low connotation explanation to go along with his technical explanation in these vids but I think it evokes those interested to learn more. Like diving into Thiel Small Parameters accordingly. If you haven’t had the chance of seeing his wild box builds from back in the PWK days... I highly suggest finding those and some of those designs and builds were way beyond anything of their time... meaning the tech was there but no one was really tackling what it took to design and make tapered waveguides, T-Lines and aperiodic chambered boxes for the time... I remember Hexi getting hammered by quite a bit of his viewers and people of industry to release what software he used back then and come to find out if I recall.... it was his own design and maybe if I recall it was one of his projects for engineering school though don’t quote me on that but I think that’s what I remember him saying way back when he addressed the issue in a small snippet of one of his vids. Either way he has definitely contributed to the audio community as a whole... both automotive and hi-end/hi-fi home audio. For that I am thankful he continues.

I wach this guy for about over year. Grat teacher. Confirm, best visualisation.

Nothing is to be said, another crisp video by HB!

Keep up the awesome videos! Can't wait for that 4+ driver isobaric loading thing. I'm not building a damn thing but I love learning about it all. Maybe one day I'm gonna have to break out the power tools!

Superb presentation and clarity, why can't everything be like this?

Excellent explanation. Thanks!

Thanks again man you're a font of massively interesting audio knowledge keep up the good work 😊

I was just thinking about my past subwoofer systems. I think it would have been 30-31 years ago when I built my first isobaric sub system. 2 15's in a 3.5 cubic foot ported box. For music I've never heard it matched for clean, smooth bass. Very accurate to 25 Hz.

Brilliantly explained!

I like you videos because of how informative they are. Even tho I might not understand all those numbers it's good to know how those numbers work and what they are .

That was perfect. Thank you very much for the explanation. I value your knowledge and time.

I did a push pull with 4 12s in a mustang svo in 84 for a buddy. Everyone was blown away.

The quality of your videos are amazing! Creation of these videos must take very long - i appreciate the effort!

Hard lesson learned...20 years ago i had a pair of 15" Orion XTR subs that I could only fit in a HUGE sealed dual chamber enclosure that took up 90% of space in the back of a Honda CRX...i sold those subs to a guy who built a smaller sealed enclosure that had the subs firing isobaric and into the corner of the trunk of a Nissan Maxima with roughly the same power i was feeding them in my CRX...needless to say I was impressed by the output and felt stupid afterward lol

Great info. Makes me want to go Isobaric on my next build :) particularly fascinated by isobaric in a t-line, but that'll have to wait!

Thx for breaking it all down, useful information.👍✌

I have to say I like your Channel. And this is coming from a guy who knows this stuff also, so I mean this as a compliment. I started doing this back in the early 90s when I also got my MECP. And was doing high-end audio installation. I'm also one of those people who can't watch reality TV or all that other nonsense so enjoy watching stuff like this even if I already know it. Also I like that I can enjoy learn different tactics and or touch up on things that I forgotten over the years. Regardless I see too many channels that just recap the basics that everybody already knows. I've watched effuse your videos and I like your approach and the level of detail in which you explain things. I like the technical stuff. I don't like people that try to make their channels more interesting by cutting out the technical stuff and heading in a bunch of made-up nonsense, like all of a sudden you get into an argument with one of your guys type nonsense just a raise the drama effect.

most excellent video👍 i will watch all your videos about building my 4th order bandpass isobaric box before i cut any wood. i am wanting a true "sub"woofer setup with no extra bass above around 40hz, my main speakers take care of 45hz+(club bass i call it), my biggest problem is i can not find the t&s parameters for the "dcm replacement kx212" pair i got off ebay🤣😂🤣😂. i am after lower bass than the kx212 can go (25hz). i really wish i had a laptop or something to get winisd but i only have my phone. thank you for making these videos and helping the world understand a little better🙏✌️

thanks so much for these videos.

Excellent explanation! The bit about TL was quite unexpected! Really looking forward to that isogroup video!

Hexibase - love your channel. I’ve learned more from you than nearly 30 years of DJing, Car Stereo & Home Hi-Fi. Really love your channel for years! Do you still do enclosure design based on specific vehicles? I’m buying a new vehicle and want you to design my sub enclosure and recommend drivers. Thanks!

Great write up! The 2 times I've used an isobaric alignment, I got results that were very favorable. Smaller enclosure and low distortion...

I love your presentations!

This is way above my level of understanding however, I found the video interesting and informative for those who are looking to wire up subs. Cheers, mvh

I had a dual isobaric once upon a time it was rather large and heavy 4x10" Seas P25REX 8 ohm 93 db spl wired in series/parallel which gave the amp a nice easy to manage 4ohm load in a sealed enclosure mounted with drivers facing away from each other (magnet to magnet) it appeared as a 2 driver system, it was the best sounding car subwoofer I've ever had. It sounded very clean and tight zero booming, very musical. Most subwoofer set ups back then were ported enclosures which I have never liked due to the boomy bass (which you could hear a mile away and not very musical) Mine on the other hand was more or less contained within the interior of the car (at loud enough volume believe me) I never liked to telegraph sound like most seem to do. I guess in hindsight I could have used a 2 driver set up but the Seas drivers I choose were only available in 8 ohm and I didn't want a 2 ohm load going to my amp. I was fascinated with Isobaric from the time I heard about it and was very pleased with the outcome. BTW the amp I used was only 300w bridged, now I see amps of over a kilowatt as standard subs rated 2-3k. I don't quite understand that thinking.

You the Man! I've made an isobaric box w/ 12's. So tight, so clean. You can hear the bass notes. You essentially waste one driver & the power to drive it... In my case about 450 watts. But she was clean!!!!! I've gotten almost as clean w/ a 2nd backward driver w/o losing SPL. But an isobaric is the cleanest. You just power it by burning money.

What makes this presentation possibly confusing is you can also have side by side woofers but wired in parallel, and you can also have clamshell isobaric but wired electrically in series (a pair of 4 ohm woofers as 8 ohms total for example). People watching this video might think you have to wire it as you show here but they really don't.