What is better? A big port or small port tuned at the same frequency.

[@educated_guess]

I prefer the narrow port personally. I find that the box does not have to be as large and for daily music it sounds much better.

[@HighVybeTribe]

What exactly is daily music ? Thanx

[@chrishernandez2490]

This is awesome dude. I had no idea that port area could affect the bandwidth of the enclosure

[@ConsanguinitySlam]

thinking intuitively, the big port would have less air friction and compression and would he closer to an ideal model you’d get from WinISD or something. with the smaller port, the air friction would essentially slow down the speed of air movement and emulate a longer tube, allowing you to play a bit lower. however, at tuning, the air friction would also reduce your output as some energy is being lost.

[@caraudiolab]

Great feedback!

[@gregblau8082]

Great info

[@caraudiolab]

Thanks for watching!

[@Randy_G]

Great explanation. What about the difference in the same sub with the same net volume but using a double flared port, straight pvc port, and wooden rectangular port inside the box and pro/con of each? It might be a long video. :). Anyway keep up the great content and awesome channel.

[@caraudiolab]

I plan on doing a slot vs. round port soon. Also, I hope to do a flared vs. not flared port sometime as well. There are definitely differences! I use different ones for different reasons! Thanks for the video ideas!

[@evilinside5984]

@@caraudiolab - I have seen that port requirements/equivalence using a rectangular port vs an "Aero"=( flared @ each end ), port= can be approx. 35% smaller. Example: If a rectangular port is 100 Sq. In. Of port area, a "Aero" port can be 65 Sq. In. Of port area.

[@Petar120]

Blew my VE1522 by having too big port even while playing on tuned frequency of the box, was tuned to 35hz and i didn't listen to anything below 30hz 99% of the songs were 35 and above and still 1 day just decided to die and stop working, so ig it's better to have smaller port than bigger because with smaller at least you won't kill it, yeah it won't get max performance but at least you can still listen to it

[@caraudiolab]

What kind of power did you have on it?

[@Petar120]

@@caraudiolab GZTA1.2000MK amp but i don't think i had full 2kw of power, maybe around 1200rms at 1 ohm, it was playing really nice shaking the whole car, it was covered under warranty they sent me new woofer 2 days ago now im making a smaller box with smaller port, last one was around 120liters this one around 90L, the shop owner told me it's the port issue, woofer worked for almost a month before dying

[@ckodezpohio5944]

Bit off topic but can i put a 5.25inch sub in my custom 40hz box made for 6.5inch sub? Will it still play 40hz?

[@Nissanalltheway]

I have 2 u 18s walled 11cf box with 2 8in big ass ports any suggestions on what port I should use. I’ve been trying to figure out because sundown recommended 64sq of port each so that’s 128sq port area tuned to 34 but my port area is 50.24 I’ve been doing research everyday can you help me thanks for your videos

[@Nissanalltheway]

I’m assuming 2 8in round port are [8x3.14}x2 50.14sq port area idk if I’m right I’m wanting an Musial tuned 34hz I have 12k just for room with power

[@caraudiolab]

Sundown recommends 16 cubic inches opening per square foot of box size. Most of their subs, including the U series, follow this. So, you could add one more 8" port. However, the real question is, do you hear chuffing with your current ports?

[@Nissanalltheway]

No chuffing or high winds I’m able to make an square port the room I’m able to work with is 28w 11 h and length 15 to work with I don’t have enough room for an additional 8in port but I can make an wooden rectangular port

[@caraudiolab]

@@Nissanalltheway Your calculation is off a little bit. Here is an online calculator you can use: www.the12volt.com/caraudio/boxcalcs.asp#por However, if you don't have chuffing, then it is up to you if you want to add additional ports or increase a port size. You are around 100 square inches of port opening right now. You can do a slot port (rectangular) if you want. However, folding it back and forth may cost a small amount of db. Are you unhappy with what you currently have?

[@Nissanalltheway]

Yes it’s tuned very very high around 37. And I don’t have enough depth for longer ports I would use 2 8inch round bit I can only make them 10in so it won’t be close to back wall that is 16in depth.

[@nagyandras8857]

nope. that is not what happens. the port acts like a litteral pipe. due to its length alone it will have harmonics. allso the air in that port has mass, and will resonate. you can measure, a drop of Fs when the port is big and long, vs when its short and skinny. both tune to box to the same freqvency, and the effect on Fs can be modelled by approximating the air mass in the port. not a huge change, but it is what it is. the larger change is the port harmonics freqvency. if the port is supper huge, the port resonance will actually have a bump in output. whitin the desired passband. and you will end up whit a sub, that actually plays midbass too. can be efficient enough that a 2nd order crossover will not manage to tame it. you end up whit a very bright , mushy sound. and lack of sub sound. in fact, imagine if the port is just as big in surface area as the box panel where you plan to put it. yess, that ends up as a TL. ports are a transmission line load on a sealed box, but allso have a helm-holtz resonance. that simple. aim for about 18 m/s port velocity Fb, and yer good to go.

[@brockmarquis8511]

Good stuff

[@caraudiolab]

Thanks Brock! I always appreciate your feedback!

[@BIGBASSSAMA_4]

Make a video on 2 smaller sealed subs as loud as 1 ported 12

[@caraudiolab]

Check out the very first video I posted, "Why Sealed box is better than a ported subwoofer box." I actually talk about that!

[@BIGBASSSAMA_4]

@@caraudiolab no I mean in a real test irl

[@caraudiolab]

@@BIGBASSSAMA_4 I am actually going to do this when the weather cools off. I need to build the boxes and get everything ready for it. Thanks for the interest!

[@BIGBASSSAMA_4]

@@caraudiolab I've yet to see someone do an experiment irl on this on KZbin with scientific purposes in mind

[@caraudiolab]

@@BIGBASSSAMA_4 All the Bass stuff on KZbin isn't really technically minded. That is why I started this channel. I wanted to bring information to people about car audio. I plan on doing real experiments on my videos that get a lot of attention. Otherwise, I don't really know what people want.

[@z1berzerker]

Every builder 👷‍♂️ develops a lil bit of a system for porting. I like 4 inch round ports for 12's in a standard 2 cube box. Like he was saying big ports have a tendency to lack cone control. Unless you are in a competition I stay away from big ports... at max on 1 sub it might give 1.5 db, zaps the wallet when you smoke 🚬 the sub and the amp. If you have money 💰 to burn 🔥... I am curious about the bigger ports that actually work lol 😆

[@caraudiolab]

Exactly!

[@evilinside5984]

@z1berzerker- Bigger ports(up to about half of cone area imo.), provide MORE cone control, but in a narrower freq., range.

[@z1berzerker]

@@evilinside5984 right ✅ DD sez 67%. I like 1/3-2/3. Just depends what common size pipe/port you can track down. Sounds chuffy... put some wood inside to take up a lil space

[@evilinside5984]

@@z1berzerker - Port chuffing/noise, just means the port area is not big enough. That 12 to 18 sq in. Of port area, per cu. Ft. is not the best way to calculate port area. Cone displacement is= Cone area x X Max= Volume of air displaced, vs the size of the port area, this will dictate the amount of Vent Mach Velocity there is.

[@z1berzerker]

@@evilinside5984 just my approximate guidelines/notes 📝. Theories are great 👍 just talking to people supportively. Pray for Peace ✌ in the middle 🙏 ✨ east

[@Thumper68]

First example for one 12 both the ports listed to big imo.

[@JasonWW2000]

I believe he's referring to slot ports. 15 sq in per cube is very common. The 25 sq in per cube is definitely over sized, but can be used in competition.

[@caraudiolab]

Great catch, I was thinking slot port. Thanks for that clarification!

[@lee28.78]

A+

[@caraudiolab]

Thank you for the feedback and thanks for watching!

[@madukameregini3806]

You talk a lot and yet not point make, just confused, u are making no point

[@caraudiolab]

Thanks for your comment! If I had watched my video when I started bass, I would totally not have understood. Spend some time and read as much as you can and watch as much as you can! Eventually, it will start to understand!

[@johnd5542]

​@@caraudiolablol so true

[@chrisbritton3452]

He made very good points. Small port for music, efficiency, saved space, bandwidth. Big port for spl, narrow bandwidth, peaky loud response.

[@LoueWhose]

The box the stoner had a 12 in (underpowered) - was the frequency response in the home of The Rock/HardRock Kik Drum ? That's what I originally was _convinced_ subs were installed for........... then I got online, an saw cats spendin $15,000 to listen to trains go by, airplanes take off, all manner of things not musical. Not a dam thing wrong with that, I have drumsets & guitars everywhere - I get it. Me, I want the kick to punch me forward - within reason (not forgetting mid bass) - and a clear (and too loud) front stage. I build all the boxs for my cars, based on what I thought I knew - and they don't suk, but I wonder if every/most channels are LOUD, and I need to try another philosophy ? Not in anyway dissin any channel or what anybod is into -_have at it_ , but I found I realy dig thumpin around in my wagons - an I wana learn. L & S here as well. R.B.G. *ManorCreep.com*

[@caraudiolab]

I love stupid punch subs, feeling that kick is the best. Some music is recorded with little to no bass or bass at reduced levels. I use a bass knob to turn up some channels/music types to get extra bass out of them. However, you need a good subwoofer box bandwidth to be able to play low bass and high bass.