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- เผยแพร่เมื่อ 19 ก.ค. 2021
- The info is grossly simplified to gain a base idea and understanding of the fundamental principles and not all the examples given work exactly how they are presented, but it's the idea and way of thinking that's important.
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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!
Great info!
That ruler example makes a perfect point!
Fantastic best explanation ever. I can now show my mate why his twin 15s are quite compared to my single 10
Lol 2 10s will blow 2 15s outthe water nobody has the space to put a fat enough port for 2 lmao
@@kkpage01100 umm...damn near any mid/full sized suv has enough space for a proper sized port. I had 2 Kicker l5-15's in my suburban with a 17"h x 6"h by 20"l port between them. If I remember correctly I had it tuned around 29 Hz. They wanted SOOOO much more power than I had the funds for.
@@less5406 yeah a suv not everybody has suvs just to put beat in 😂😂 im talking about a regular person that don’t the understand port area part. Usually mfs that think 2 15s is going to blow 2 10s away but shieeet 10s slap hard as shit
Now give thoughts on 4th and 6th order boxes.
Assuming you mean bandpass enclosures, they follow the exact same laws of physics explained in the video. The only difference is that they include a steep rolloff above their tuning where a conventional ported alignment does not. And to clarify my first statement, conventional ported alignments are 4th order enclosures.
4th order is the benefits of both sealed and ported in the same enclosure....6th is 2 ported boxes tuned to different frequency..one side is high the other is low so you get the benefits of all ranges..down side of both boxes is they require more air space...
@@MyBlowncobra No. Bandpass enclosures aren't the best of both worlds, they're a world of their own.
They are purposefully bandwidth limited alignments and limiting bandwidth is seldom a best of scenario.
They're useful for high SPL builds or as natural low pass filters but that's mostly a bygone use since we now have very accurate and dependable electronic crossovers.
They are by their very nature, bandwidth limited alignments and as such you do not "get the benefits of all ranges" with them.
@@BrandonBuckaudioanarchy I would say that depends on how you design the 6th or higher order enclosure and the installation. So you're both correct.
No. Band pass literally means a relatively narrow passband. It is impossible to design a bandpass enclosure with the bandwidth of any other alignment.
You can design a bandpass with wide bandwidth relative to other bandpass enclosures but you will always be faced with the upper end roll off that you don't have with other alignments.
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!
Ya know i truly love your videos, they are vary informative. U are a really smart young man thanx for taking time to share. ..
This video deserves a GOLD STAR in the audio Archives!!
@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)
Short, sweet,& to the point.
Excursion and power are cheap today,I love sealed boxes.Great job here on ported.
Best explanation ever.
By far the best explanation i ever heard. Every word is gold. amazing.. and i been building systems for years
love these short vids man, keep on explaining and busting the myths my man
First video I've ever watched of yours and you got my sub, thanks for the content. Very well done 👏.
Which sub you gave him?
Funkypup?
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.
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 description I have ever seen/heard.
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.
Bandpass enclosure... the entire cabin is a box, with a sealed and ported side.
@@n8skow I'm not quite sure because there is no port to the outside on Craig Butler's video to make the cabin into a front bandpass chamber. You'd have to make a substantial opening to get that big area to resonate at ~70Hz. Making the cabin a half wave and trying to get the sound wave to rebound at the woofers and the mic, so the woofer loads agains maximum air pressure might give some good SPL, especially with a sealed chamber that resonates at the same frequency.
@@TimpBizkit it IS a bandpass. The entire opening you are looking through when you see the woofers is the port. Its a very common design on the BIG number builds... woofers in tiny sealed enclosure placed inside a huge ported cabin.
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.
it makes me so happy stumbling apon a video about a thing i saw in my facebook groups keep it up man
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.
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.
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.
Roger that!
Great explanation! Now I know why my cones hardly move but feels like it's ripping the car apart 😉👍😂
Best description I've ever heard 👌
Best explanation for sealed vs ported even audiophile couldn't explained this any better 😂
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.
"WE'RE NOT WORTHY, WE'RE NOT WORTHY" 💯🔥
I have a JL10W7AE in their sealed box and it sounds amazing! Driven by a JL Audio HD750/1.
Short and to the point. Great video Sam.
Awesome explanation! More videos like this please.
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? 😉🎶👍🥳🎵😍
absolute brilliant explanation!
That is an exceptional explanation.... ive fully understaood everything...
Excellent!!! Thank you.
Fantabulous explanation!!
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
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.
I enjoy watching these videos full of great information that can help better understand things
Awesome video bro! Thanks for the knowledge!
Thank you, definitely the best explanation I've heard yet.
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.
Thank You for a great explanation. 🙌🏽
That's an explanation! Good job mate you earned subscriber.
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. !!!
Very informative.. thanks..bv
amazing work! tks
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 was well explained Sam keep up the good work Sir nuff respect 🇯🇲 🇺🇸 🇬🇧
top 5 youtuber. love these technical videos, thanks!
That was a great one! I haven't thought about it like that
THX
Great explanation , waiting for part 2 💪
Great information sam i learned alot
Amazing explanation 👏👏👏
Right on. Thanks 👍🏽
Outstanding!!!
Thank you for this knowledge
wicked info mate appreciate it
Thank you that was one of the best explanations I've ever heard 🙏🏽👍🏽✌🏽💯
Thanks for this great explanation, it keeps me busy and food for thought. ;-)
Outstanding!👍👍👍
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.
Was just wondering that exact thing. Thx
@@Steve_Just_Steve No problem
Damn I knew I missed something!
@@barevids All good bro. It was all about ports. Passive Radiator can be the next video. The video is for sure spot on. Great work man. Waiting for class though.
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
Trial and error, and critical thinking. Often just find myself thinking about the workings of different processes and I can usually figure out how and why they work how they do.
Thanks brother!
a very good video. top stuff fella :)
The steel integrity SQL series subs are perfect for sealed enclosures and can even play down to 8 hz sealed.
amazing comparison with that ruler
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.
Thanks a lot. I understand exactly what is happening now.
Took us to school and we didn't fall asleep during class! Great video Sam😎👍
Lol “..some base information” I see what you did there. Thanks for the video. I shared it to a bass group I’m in.
So cool Sam... where do you come up with this stuff. Real world right here...
Nice 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?
Great stuff man
Very good video💯👍
Good chat m8 you explain things well
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.
You did a pretty good job answering the questions. I just have one, do you know what the comb is?
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).
Other solutions include using the right box for the subwoofer 🙃😉
@@sedon7098 still doesn't fix a complete lack of air spring below port tuning.
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.
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.
Thanks for the Knowledge Sam, what are your thoughts on Horn Enclosure for Car?
spot on!
Can you explain how this can be applied to band pass enclosures
Like he said, the sealed side acts like an air "spring" so the sub gets help controlling the back stroke. And the front ported side still acts like the ruler, BUT you only get output at the end (port) of the ruler, and almost all frequency outside the port frequency is lost.
I can't remember....I think it's a 3db increase at port frequency vs if you erased the sealed side.
This gets complicated by are we talking 4th or 6th or X order?
@@ryanwaege7251 when I made the comment I was thinking about a 6th order and how both sides being ported would affect the sub movement
@@StarBoimuzic I was going to guess that, didn't want to assume! Take his example of his fingers holding a ruler but add a second ruler pointing up/opposite the first one. Front and rear chamber (ports) both amplify output at the port frequency/ resonance, reduce output at other frequencies. No cone output, just port.
Keep in mind, while the sub hardly moves at port frequency, everywhere else it is working against the enclosure. In other words, excursion, lots of it, usually followed by blown sub. Because bandpass also obscures the sound of the sub's coils performing ritual suicide. Ask me how I know. 😁 Of course, you also clip the amp for max gains in a competition. It all increases those dBs but like a tuned engine it becomes more fragile because of the increased output.
Forgot - because of the out of port frequency issues with the sub, always pair a bandpass box with a band pass EQ filter that matches. High and low pass to keep the sub from killing itself.
@@StarBoimuzic Read your reply again, specifically how it affects sub movement. The sub will again move less the closer it is to the port frequency. I only saw 6th order in competitive setups where both sides were tuned the same but I gather you can actually tune them different so you can make 2 different bumps in frequency response, one from each side. So...like 2 different length rulers.
Wow I feel soo much smarter now!!! So if the port is bigger it can create more pressure?
Pretty cool man.
Ooooo this will be a good one!
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!
A great explanation of how subwoofers and all types of enclosures work can be found on TH-cam channel hexabase. He is an acoustic engineer and very good at explaining the concepts of this topic. He is very thorough and technical.
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?
Can you explain why larger sealed boxes play lower than smaller ones (and hence seem much louder)?
It's the alignment. Bigger makes the resonance frequency lower. Look up Sealed Qtc
What i dont get is some guys want to get an 18 put it in a seald box and throw big power at it and with that large of paper cone i would be afraid that is why i always suggest a ported enclosure for something that large or an IB
I like the ruler thing.
I currently have a Resilient sounds team 15 it's not powered up yet I'm still saving money for an amp and electrical.
This is an absolute must for enthusiasts to understand. Thank you for this explanation.
I always wondered why spl woofers claim they are not intended for sealed boxes. I suppose you could put them in a sealed box, but it could rip itself apart if you use it at high power. If I understood correctly.
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 🙂
A friend of mine was doing the same with a Kicker Free Air 15 in a VW Jetta around ~ '98/'99 and man was it loud. It was almost as loud as my 2 Eclipse 12's in a sealed box on about 650 watts. I miss those free spirited days when competition was fun and no one got butt hurt when the Outlaw BASS guys showed up at an IASCA event and the SQ guys swapped build stories with the Outlaw guys.
@@jdizzle3740 I miss those days, I guess my midlife crises has arrived as I am upgrading my car with amps and speakers again :P Not anything super good, but a good upgrade from stock at least. I bought an used older PG amp at 600 watts in 2 ohms, but I am still running a rather bad all in one 12" until I can get a new box and 12" for the amp. Maybe even a 10", not sure yet. :)
@@jonbeargenx Same here. I picked up a budget gem JL Powerwedge Max 10 w/250 Watt JL Amp off CL for 75 bucks in great condition, have a Memphis 2/3 way xover for it and run off an adaptor from the factory head unit (want to fix that), upgraded the doors and added Tweeters to the factory location and it sounds pretty good (not like back in the day when i would hit 148-149 db in a low power class, but for my old self, it definitely works for better SQ). Glad to share the, I won't say midlife crises, rather, nostalgic moment. Have a great one boss.
@@jdizzle3740 That's great! Nostalgic for sure :) You have a good one too buddy.
Thx!
great vid, actually made the penny drop in for me!
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.