That ruler example makes a perfect point!

Small correction. When the frequency is higher than the port tuning, like you show in 8:49 what happens is that the inertia of the air mass in the port makes system act like a sealed enclosure and that gives some control to the cone and limits excursion. Under the tuning frequency there is no help from the box like you mentioned. Thanks for the great video!

Fantastic best explanation ever. I can now show my mate why his twin 15s are quite compared to my single 10

Now give thoughts on 4th and 6th order boxes.

@barevids , I have been watching these videos for 9 or 10 years now. You have absolutely had a massive positive impact on my knowledge and understanding of car audio. I greatly appreciate all you have done for the car audio community and industry. Because without a doubt, you have definitely helped propel this industry forward more than you will ever know! -Your fellow basshead, Bassabigdeal. ( forgot password & Google won't help)

This video deserves a GOLD STAR in the audio Archives!!

Excursion and power are cheap today,I love sealed boxes.Great job here on ported.

love these short vids man, keep on explaining and busting the myths my man

By far the best explanation i ever heard. Every word is gold. amazing.. and i been building systems for years

20 years. Many Books. Many VIdeos. THIS video explains the Physics behind it better than any other I have EVER watched. THE BRITS WIN AGAIN!

Short, sweet,& to the point.

First video I've ever watched of yours and you got my sub, thanks for the content. Very well done 👏.

The car audio industry owes u Sam! Great vid

The way you compare it to something tangible helps enormously! Very very interesting video Sam, I have indeed experienced this first hand during testing and I knew the woofer moves the least around tuning; But this really clarifies the science behind it and also helps justify purchasing a more expensive, more powerful woofer if you want to loud and stay compact! Thank you so much.

Best explanation ever.

Ya know i truly love your videos, they are vary informative. U are a really smart young man thanx for taking time to share. ..

I was one of those asking for the info on the group. Thank you for making a very informative video. The relay/amp turn on video was another awesome video. Keep them coming. Great stuff here.

Best description I have ever seen/heard.

Superb explanation. I’ve been in the car audio hobby for over 30 years and this is the best explanation of ported boxes I’ve come across.

One of the best explanations of ported enclosure theory as stated. This can also be demonstrated with a slinky in the same fashion as the ruler.

I have seen video footage of winning one note wonder SPL vehicles. Craig Butler actually uses 2-4 digital designs 18s in small sealed boxes made of a wide diameter tube. So I can only guess they are tuned to resonate at 70-ish Hz and then the rest of the cabin is designed to resonate - either by standing wave or some sort of bandpass to the exact same frequency, creating that huge one note wonder bass.

It might be helpful to add that the reason why you're able to produce such huge excursion in a port with such little energy is resonance. Everything has an F0 or, resonance frequency and that's the frequency at which the thing vibrates the most with the least amount of input energy. I think one of the most useful visual representations of the power of resonance is the collapse of the Tacoma Narrows bridge. The bridge does fine in the wind until the wind causes it to oscillate at its resonance and then, almost suddenly, it self destructs. The same thing can happen to your subs in an enclosure that's improperly designed.

One error that I can't ignore, The speacker does not compress the cabin air as I preceved you described. It creates a shock wave of air which then propogates away from the driver and compresses the ear drum once it arives to the listeners ear. The air as a whole does not get compressed inside the cabin.

Best description I've ever heard 👌

I have a JL10W7AE in their sealed box and it sounds amazing! Driven by a JL Audio HD750/1.

The easiest way to deal with the lack of damping below the port tuning is by using a very steep HPF below the port tuning, but that adds group delay (which ported or passive radiator alignment as a 4th order system already has more than a sealed alignment, which is 2nd order).

Excellent description man. I never understood how my small jl w7 sub with a port could be as great sounding as I remember my old 12s when I was younger.

Short and to the point. Great video Sam.

Learned a lot. And I've been into car audio 30trs...you should definitely make a series...!! You could teach many people lots of information. !!!

Awesome explanation! More videos like this please.

That is an exceptional explanation.... ive fully understaood everything...

I enjoy watching these videos full of great information that can help better understand things

Fantabulous explanation!!

Excellent!!! Thank you.

4th order is so much better, I get both my lows and high Bass. If anyone is going for musical, and you listen to a wide range of music, 4th order is the best way to go.

absolute brilliant explanation!

This is an absolute must for enthusiasts to understand. Thank you for this explanation.

amazing comparison with that ruler

Great explanation! Now I know why my cones hardly move but feels like it's ripping the car apart 😉👍😂

The old school cerwin vega stroker was a good sub to demonstrate the difference between big surrounds and tiny surrounds. Jl subs works best in ported boxes excluding the flat subs. Box design matters more than most think. 4-8w3’s 1000 watts 160db is my best.

Thank you, definitely the best explanation I've heard yet.

That's an explanation! Good job mate you earned subscriber.

The steel integrity SQL series subs are perfect for sealed enclosures and can even play down to 8 hz sealed.

That was a great one! I haven't thought about it like that THX

Right on. Thanks 👍🏽

it makes me so happy stumbling apon a video about a thing i saw in my facebook groups keep it up man

top 5 youtuber. love these technical videos, thanks!

Sealed for the win all day long and it sounds so much better without pissing the neighbours off bass inside not much outside. 2 x 12" 600w peak pioneers running 2ohm at 600w rms I can't wait to get dual voice coils and get it down to 1ohm. + ported is tuned to a spefic freq and most will not boom away from the resonant tune.

Amazing video! Thanks for all the knowledge you do a really great job keeping it simple and weeding out all the crap information in car audio in all your videos Again well done!

That is great explanation. 👍 Ported design is fun. A natural development in our life long hifi journey is one day we discover that ported designs is FUN but less HiFi. Air is compressible and if we are looking/listening in the time domain when woofer go in the air is first compressed then is escaping the port and make sound. And that is happening AFTER that the note and the cone has played the note. So signal and real event is happening and the cone moves then AFTERWARDS the port makes a sound. WHEN port makes sound that has nothing with the signal from the recorded event that has already been and past. In the opposite with IB/OB/sealed we get the signal and the direct sound from the woofer when the it is happening. So no smearing afterwards in the time domain. That enable us to hear texture and tone and therefore is more HiFi in its real meaning. But ported design is more fun and impressive sounding and who do not want to have fun? 😉🎶👍🥳🎵😍

That was well explained Sam keep up the good work Sir nuff respect 🇯🇲 🇺🇸 🇬🇧

In the early 90s I ran a 15" in an open air configuration in a VW Beatle. Not sure about the wattage I had, but I am guessing 350W ish. It was still very loud and rich. Thanks for the video 🙂

Thank you very much Sam. Can't wait for the next one of these videos. Perhaps some more in-depth information on sealed and ported designs...wich if you do it right, should allow a person to understand the relationships going on with 4th order bp, and the love/hate for 4th/6th/7th BP designs in general

The difference between sealed enclosures and ported enclosures in the car audio industry is as simple as this. Sealed enclosures- multi- million dollar business. Ported enclosures- multi billion dollar business. That is not counting the "music" industries production of computer generated pulses that two generations of people can't get enough of.

Thank You for a great explanation. 🙌🏽

U got me intrigued. In some of your videos you sound like a mad scientist with going to engineering school. I'm interested in electricity too but no schooling either. What was the process? How do you know so much

amazing work! tks

Exactly! A port is a speaker cone made out of air! That's the reason why a passive radiator works You're just using a cone and a suspension with no magnet or voice coil to replicate what a port does.

Outstanding!!!

Thank you that was one of the best explanations I've ever heard 🙏🏽👍🏽✌🏽💯

Fantastic video..now you should do one explaining how subwoofers work in the most common types of Bandpass enclosures like 4th and 6th Order Bandpass enclosures!

"WE'RE NOT WORTHY, WE'RE NOT WORTHY" 💯🔥

Best explanation for sealed vs ported even audiophile couldn't explained this any better 😂

Very informative.. thanks..bv

Thanks brother!

Took us to school and we didn't fall asleep during class! Great video Sam😎👍

Great way to explain it, great vids bro! PLEASE explain the Pros vs Cons is a Bifilar voice coil ...from what I read it’s more SQ/SQL based vs SPL, and I’m rebuilding my Alpine SWX-1243D which uses an inset (inner/outer wound) voice coil, so I need to replace it with something almost as good and thinking an 8 layer flat alum bifilar is the way to go ...would really appreciate your input homie.

Yup because most people including myself doesn't understand how everything fully function the why you do. It really amazing the amount of thing you understand and can explain for your age. It takes a lot of passion to learn as much as you have and have a full understanding of it all impressive well done 🎶👍👌✌️💯🥂

perfect and thank you .

And for those of you that might inquire, the same theory applies to Passive Radiators, but your tuning is based on the cone mass, and cone displacement.

Notice, as you increase the frequency you shake the ruler the point the ruler spins around approaches the bottom of the ruler. At ‘tuning’ the bottom of the ruler rotates around the point you’re holding.

Lol “..some base information” I see what you did there. Thanks for the video. I shared it to a bass group I’m in.

Nice explanation

Awesome video bro! Thanks for the knowledge!

Great explanation , waiting for part 2 💪

I like the ruler thing.

Can you explain how this can be applied to band pass enclosures

Thanks for this great explanation, it keeps me busy and food for thought. ;-)

Thanks a lot. I understand exactly what is happening now.

I currently have a Resilient sounds team 15 it's not powered up yet I'm still saving money for an amp and electrical.

a very good video. top stuff fella :)

Amazing explanation 👏👏👏

Your explanation verifies the approach at which subwoofer to get determined by the rear subwoofer cone that shouldn't be blocked by the subwoofer frame or basket. For instance CAB 18s and Mmats 12 Juggernauts. Get the picture?

This is the best explanation I’ve ever heard, period. Haha! My understanding of ported boxes was way too basic… until now. Thanks dude 👍🏼

Good chat m8 you explain things well

Thank you for this knowledge

Wow I feel soo much smarter now!!! So if the port is bigger it can create more pressure?

Great information sam i learned alot

Outstanding!👍👍👍

Can you explain why larger sealed boxes play lower than smaller ones (and hence seem much louder)?

🤯 When You Started Swinging That Ruler. And Then Excursion For Bandwidth. So Awsome! I Play My Subs At Full Excursion At Tuning On My Ported Box But As Soon As You Go Out Of That Tuning It's RIP Suspension! I Have To Have A Very Aggressive Roll Off Hz Curve On All My Music I Edit For Demos. The Goal Is To Have The Same Excursion At Tuning And Same Excursion Above And Below. If You Dial Your Db Curves At Certain Hz Trailered To You Subs Tuning You Get Some Killer Longer Lasting Demos With Alot Less Manual Bass Knob Control lol. It's More Complicated Then This Too. Because Even Though You Keep Your Mechanical Movement Uniform The Coil Thermals Are Not.

Let me know if you ever come to Portugal 🇵🇹

This reminds me of Pete (hexibase) videos on box orders he does.

Sam doesn't use parables. He gives a direct illustration with elementary concepts that anyone can absorb an apply. Granted, high end animation is awesome, ...still waiting on that transmission line illustration, and pros and cons thereof.

wicked info mate appreciate it

So it's possible to reach a point where, in a sealed box, power handling doesn't matter? Sealed boxes are somehow limited and it doesn't matter how much power you throw at your sub it won't get any louder? From my understanding it's not only how far a cone moves but how much force it's moved with that makes pressure. That pressure would have benefit in any enclosure wouldn't it?

oh snap! Boy got that legend of zelda hat in the background!

Thx!

and thus why transmission line enclosures can provide ridiculous low end with no 'massive power' ever involved, when done properly. space is the only issue.

Pretty cool man.