Sea sickness aside, this incredibly well presented and easy to digest .Well done . I can stop scratching my head now.

Pete has plans to remake the video without the rocking boat effect and with additional information

Didn't even notice the head movement till I read the comments I'm here for the knowledge thank for the info Pete.

Just the first 51 seconds of this video were a real eye-opener for me. The idea that you can demonstrate capacitive and inductive reactance in a physical domain has made me more comfortable with the concepts purely in an electronic domain.

I got sea sick trying to watch this.

I'd love you to remake this video for your HexiBase vlog

I doff my cap to your sheer simplicity and elegant presentation, Peter!!! You have demystified an important concept so beautifully. Totally subscribed to your channel!

I can't take all of the moving around. It gave me a 6th order headache.

I feel sea-sick after all that random motion. Informative though. Thank you.

Thanks for the explanation! I've always been curious about what the different orders were and bandpass and all that and this explains it all perfectly!

The GoPro was a really bad idea

Damn I'm getting sea sick

Long ago I was an electronics technician in the military. I learned about RADAR waveguides as transmission lines and calculated reactance, capacitance and inductance in them as part of my education. It has never occurred to me that the same principles apply to acoustic frequencies. Very interesting. And, yes, I feel sick now. It helped a bit when I reduced the video window to a small corner of the monitor and watched from across the room.

Awesome video!! A little too much camera movement in the video though. Cant wait for the next video in the vlog!

motion sickness set in and Puked!

Really unpleasant to watch. Made me nauseus. I really like your videos otherwise. Didnt get much of what you said here because of the tilting

Thank you for making this video, you've clearly explained what i've been looking for an answer to for months.

got seasick ... immediately

This wealth of knowledge is so valuable and potent its like Fine Wine, Pure Gold or Expertly Crafted Chocolate Milk Im subscribing

Hybrid Bass Reflex Transmission Line T-Box... TTB days..Your design for me eons ago...FTW! Thanks again Pete!

Great info in a fun easy learnable movie. Can you please make this without the head cam. I do really use your videos for my lessons on thermodynamics and if you would like to backup the statement you sad in the introduction for the production. Thank you keep up the great videos Hondaman6

Please remake this with a static camera.

Great video! Could you touch on things like port and subwoofer positioning to control cone displacement within the chamber, maybe touch a little bit on the fluid dynamics within the chambers or port. Why compression in aero ports functions better over slot ports for example, or some information on the acoustical relationship between amp and sub, dampening, how impedance functions in a relation to cone displacement the order of enclosure etc. It would be great to hear some thoughts in series/paralleling or vicecersa or combination down multiple drivers and how best to acheive balance of resistance between all drivers and how an amplifier internaly copes with impedance changes over frequency. Keep it up mate good to see you back on making videos!

Pete that is a very clear explanation/presentation and I look forward to what you will be brining up next.

You're knowledge blows my mind, and you're actually very amusing lol. Subscribed 😊

Thank you for the video but I could not watch it to the end as I got seasick. Camera mounting this way is not a good idea. Hope you will redo th video so I can watch to the end (and learn from it).

Yeah....I can't watch. I got motion sickness also.....

Yes please for the static camera. Great videos but the movement gives me a headache

Mind blown. Best explanation of this I have seen sofar. Thanks for the great info

I got a fucking headache from all this movement. What am I on a boat? Just mount the camera somewhere jesus christ

Very Happy to see you have an enclosure design service for other brands too :)

I'm a big fan of your knowledge and presentation style. However, I cant watch this one because the video makes me nauseous from watching even a little. Holy moly. If this information was available from you in text or your recent excellent video styles, I'd watch a few times.

Very well understood. However, what are these orders aimed to achieve when listening to these speakers ?

Excellent presentation !!! Thanks a lot !!!

I got motion sickness just watching.

Excellent videos AD !

Well explained, I went from loving audio to Making sub boxes using the principles I learnes here..

Thanks for making the video, but I can't watch it because of the movement. Is there a non vr version?

The rocking wasn't bad once you got a minute or so into the video. Y'all need to quit complaining. You did good Pete

Dang it...all of this time I've been debating whether or not I wanted to stay with a ported box or do a "4th order box". And all of this time I've been running a 4th order...🤣🤪🤔. Thanks for this great video!

Could you male a video to explain the differences between them please?

This camera shaking is really annoying, but great infos, thanks. Though I'm notsure I understand everything yet, but I'll watch your other vdeos to learn more. :)

could you do a video explaining how port size and length affect spl

I'm dizzy 20 seconds in. Stop moving your head so much 😭

it's great to understand the design characteristics that define each order. how about a part 2 that gives everyone a clue as to WHY one would use one design over another. Please do this on Hexi Base. Oh BTW you did not mention Open baffle (it is different than the theoretical infinite baffle) and the Bi-polar (no I don't mean crazy) design - I think it might be a form of Isobaric loading. last but not least. there is the wonderful Maggi. (Magnaplanar) I suppose that's effectively an OB design?Awesome channel Thumbs up on almost every thing you do.The "Matt Scientist"

Are you really moving your head that much? Sheesh, your poor neck.

6th order parallel bandpass is my favorite. I made it so the ports where next to each other. Slot ports and sub faced inverted motor up, dust cap chamber had a long 2.5" port thatwent along back wall and cornered along the top out the front, the coil chamber was 3" and was a U shape below dustcap port. Sub is a Memphis Audio HPO 15D4 @2ohms on a Crunch DRA850.2 not sure rms watts.

Me: I'll build a sub-box for my car as soon as I figure out what all this stuff means Also Me: I guess I'm never building a sub-box for my car

Am I the only one suffering vertigo watching this video? I'm down for the info but legithave a tendency towards vertigo and this video is over-the-top for me.

Great videos keep up the good work

Finally... I get it.

The wobbling camera makes this unwatchable

Nice great information 👍

Very enlightening and nauseating :)

What is the video link to the video for your 8th order build with the dayton audio sub?

G'day Pete, Reporting as directed... Fascinating, I had no idea that this was going on...; let me guess - your Grandfather was a Woodworker living in a Forest, cleverly carving & whittling those little Nesting Dolls for which Tourists love to pay lots of money ? This-all makes the crude "Speakerboxes" which I carefully cobbled-up as a teenager, with Speakers salvaged from old Televisions & the Amplifier-Circuit from a Record-Player....; even more hopelessly shitty, technically speaking, than I remember realising them to have been - ten years after I built them when I was trying to sell Bang & Olufsen Hi Fi in North Sydney...(!). Have a good one, ;-p Ciao !

Rename to Bobble Head Dynamics.

Do you have any advanced material to suggest in order to study it deeper?? I mean, regarding interferences between waves it could be more easy, but for what concernes capacitance and reactance, i would like to study what happens when more chamber are tuned in series and so on... Thanks, Francesco.

Silly question, but why do we want different stages? Is a 8 better than a 4?

When I was a late teen.. We had gotten a hold of a box for a 10" sub that they called a "hidden chamber".. That little 10 got loud.. at least for the fact it was just a single 10 on like 100 watts. I never seen a box made like that since, until today in your sketch up of a 6th order bass reflex. I wonder what the gains look like on those??

This is really hard to watch. Mount the camera to something other than your head.

Such a great video! I only threw-up twice from the motion sickness.

Yeah Pete, give us the knowledge. You definitely have plenty of it relating to acoustics

Too much side to side movements and still trying to grasp the concept . Great video and very informative though

Maybe its because you were jumping from 7th to 8th order just for the example of an 8th order... But how would you get any sound from the 7th order?

No 5th order arrangement is possible? If I order a 4th order subwoofer and it doesn't show up and then I have to reorder it, would that then be a 5th order subwoofer?

do not use video recording method again

Could you do a video on how different styles of say 4th order reflex boxes can load one or more subs within them? Or literally any video on box design tips and generalizations?

making me seasick....

I'm sure there was some useful information in this video but it was simply unwatchable. Don't try to be cute with the first person view it was nauseating.

Definitely prefer static camera... I actually enjoy found footage movies, but this was distracting for an educational video.

I'm getting seasick...

Thanks for a great video...very enlightening! Using your system what order is a Augspurger style Dual Chamber Reflex? The roll off is fourth order I believe.

I really want to watch this, but I'm getting motion sick. Later.

getting seasick... do away with the head cam bro damn. can't watch.

Please mount the camera . This bouncing around made me dizzy . I love the content otherwise

5th order?

Thanks for the info & bob Ross white board drawings 🔥 Can you elaborate more on the difference between the 4th/ 6th / 8th series and parallel bandpass? And how the ratio affects size and tuning ? Does Audio Dynamics have high sensitivity subs with good frequency response with decent Xmax and FS of 30-35? I am looking for one or two subs that will like 1500 W RMS. My Q40 ( G37 ) has a metal wall separating trunk and cabin with a ski pass thru only. What would you recommend for best frequency response and output enclosure and sub wise?

Can you Isobaric load all of these?

How do thesr ports affect each other in reflex 4th and 6th orders, opposing to the bandpass versions?

This was super helpful!!!!!!!!

Well explained. So just to be clear, beyond 3rd order, they are all even numbered? No 5th order, no 7th order, no 9th, etc.? Thx.

Hi. really good explaination, I understood everything, but I have 2 questions. First: In WinISD it is possible to simulate "ABC" enclosures (like a series-tuned 6th order bandpass + port out the rear chamber too like on the parallel one). It is an 8th order enclosure, or it needs to count the acoustic orders differently somehow? If I understood correctly your presentation, let's start with the 6th order series tuned bandpass, then + port outside the rear chamber = inductive reactance which brings it up to 7th + interaction = 8th? Second: I know that passive radiator is basically a port = inductive reactance. I had a Philips HiFi which have the "wOOx" speakers (I dont remember the model number now...). On the front side of the speaker were the active woofer and the passive radiator (wOOx woofer), on the rear side was a regular flared aeroport. If I am correct, the passive radiator was tuned for the low bass and the regular port for the higher bass (the port was short + the enclosure itself was not too big for the woofer's size), but I am not sure that I understood this sepeaker system correctly, because one chambered enclosure with two tunings is strange for me. So how I should count acoustic orders at an enclosure like this Philips wOOx?

+ADDesignsCarAudio Pete have a sundown audio EV3-12 6th order parallel bandpass enclosure for home theatre and musical use 5:1 ratio rear chamber 49.8L tuned to 26hz front chamber 75.5L tuned to 50hz it sounds great I wish it was a bit louder I’m putting 750WRMS in to the sub

Well, I now understand why I had to learn state-space. Modeling these must be a dream lol

Do scoop bass bins fall under 4th order band bass?

Counterview: I watched the whole video and didn't notice the camera motion until I got to the comments. Just felt like I was naturally in his pov.

Why is the 6th order parallel tube bandpass filter not a 7th order? Because the inductor would raise it by 2, however the interference would be raising it by 3?

My brain hurts and he says "it's just that simple" lol. I understand enough to watch your other video. Just a suggestion try not putting the camera on your head and put it on a tripod. Having the video move all around like that was distracting. Just a thought.

Hey, I've got a couple of old klipsch pro media subs, what could I do with them to make something better out of them? Broke as a joke, so any ideas would be appreciated.

Can you please redo this video without the camera on your head, I can’t watch this it’s making me sick

The term "HIGH" in what you call "high acoustic order."..? Do you mean higher SPL ? or Higher Frequency? or the doubling of sub frequencies? ...Please explain.

Can you give an example of a valid 5th order? I see some examples of it elsewhere, but they are never clear.

Ok I'm going to go old school here. Back in the day we quite often ran an entire system off of 1 two channel amp, the nicer amps were capable of 'tri-mode', highs in stereo and your sub(s) bridged mono, because of this setup we had passive crossover networks. For a while I ran a 6th order parallel tuned bandpass, but because of the coil (inductor), it was considered a 7th order bandpass. How does an inductor fit in when calculating orders?

take the dam camera off your head..

Now I undestand what means "3rd order". So now I have a strange idea, maybe it is totally wrong idea, but let me explain it first: 1.: simulate for a woofer the Vb and Fb simply like at a standard vented box (4th order bass-reflex), 2.: add all the displacements to the Vb, just the port's displacement do not add, 3.: design a tube-box with that volume which have the same internal diameter like the woofer's cutout diameter and outer diameter like the woofer's total diameter (or bigger - just to be able to install the woofer correctly into the box), 4.: design the port (length) for that woofer / Vb / Fb using the same internal and outer diameter like at the box, 5.: now, we know the port's and the box's internal and outer diameter, the port's length, and the total internal box-volume (Vb + displacemets), so the box length can be determined, 6.: make a tube with these internal and outer diameters, and tube length = box length + port length. So this tube will look like the drawing in the presentation, but in real world this will be not usable because of the huge length, only if you make a labyrinth of that. My question is: this will work like a 3rd order, or a 4th order, or it will work well anyways? Btw, sorry for my bad english

I think a 6th order is right for me but I don't know how to tune one. Any tips?

So a simple "sealed" enclosure but using a passive radiator is a 3rd order enclosure?

Everything is clear. Now what’s an acoustic order?

Im sure this video helps but damn! All the moving makes it nor worth knowing