What is the best Port length?
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- čas přidán 25. 07. 2024
- Don't know what length your port needs to be??
In this video I go through the maths and some principles of basic ported speaker tuning, including choosing tuning frequency itself.
Timestamps:
0:00 - Introduction
0:47 - Port basics
1:58 - Choosing tuning Frequency
3:07 - Equation Examples
6:36 - Equation for port tuning
9:26 - Software - WinISD- Inputting specs
12:13 - Altering tuning and port length to fit requirements
14:26 Conclusion/Outro
"What is the best port size?"
• What is the best Port ...
"Choosing the right Subwoofer"
• Choosing the right Sub... - Věda a technologie
Just remember that a short port is nothing to be ashamed of. If you see a port that's longer than yours, don't get port envy, just remember that not everyone is blessed with a long port.
My port is only 2 1/4"
But that is all the wider it gets...
@JoshGamer - you are a gamer kid but don't have an avatar. That means reveals you have no stereo and all "ports" are too long and wide.
I am proud to be a pilipino..go go go go philippines!!!!! Raise our flag...no one stand in our way.....
I’m a lower not a shower type
it isn't the size of the port but how you send it! lol
Some great info. ❤
Appreciate that. 👍🏻
You can buy flared ports quite cheap. Top video and tutorial.
Por fin un video que me sacó de la duda, 👌.
At 6:07, when you said that WinISD "won't show how they sound different", you can click over to the Rear Port - Air Velocity pulldown tab and it'd demonstrate just how much more air displacement you'd get from the smaller port than the absurdly big one.... If my calculations are correct, it's a difference of 24 to 6.5, or multiplied into a box I'm trying to build, a difference of 59 to 16 m/s.
For reference about the 59, that's about 17% of the speed of sound... I've always read that the goal is to say below 5%. Even the 24 equates to 7%. Not sure where that information comes from (or really how true it can be), because it's not like I see a lot of 9x9x54" ports out there to "allow" for such.
5% is for very high sound quality. You don't need a such low value. 10% is still acceptable. In fact, most of car audio manufacturs reccomend values of port area in this range
Love it! Project Smol Boi's port/vent is 49.5 x 17 x 61 . . . .inches! It's enormous, but something I had to be careful of (and why I went with a MASSIVE port) is that if your port is TOO long (i.e. your port tuning is too low) you start getting response VERY SIMILAR to that of a sealed enclosure with some drivers! At that point, you might as well save the space and go sealed.
Yeah, can be tempting to tune to 5Hz for those rare yet epic moments when immersion is ruined by the TV falling on its face lmao, probably good to have a projector for such cases!
That's the tricky thing with enormous sub boxes. If the port area ratio, length ratio and volume ratio are all the same, the bigger the box means the lower its tuned, so ENORMOUS boxes can require either really short ports or a huge area, I wouldn't be surprised if you took and entire end off Smol Boi and its T-line tuning remains in the 20s XD
@@Dakoustics BHAHAHAHA! I don't doubt it, it's a very VERY large box! I wish I had your brain over here in the US whenever I start building new projects. I'd be so much more confident in how to proceed!
What's next on your project quotient?
Can this program calculate bass port to rear side speak box? I got Panasonic rx-ct900, and those speaker need bass port. But only back side is place for bass port.
Thank you for this. This made me want to drive in to WinISD and try to tune my mismatched home theater subs. Giggity. 😊
Ok, so wich is better ?
I appreciate this, and thank you. I am in the process of building a "boom box" with 2 three way JBL oval speakers . The pamphlet mentions them as 6 inch by 9 inch coaxial car speakers. Continuous power rating is 80 watt and a freq response from 50 Hz to 20 kHz. What sort of volume should the box have as I would like to use pvc piping (28mm ID and 48 mm ID ) Where (the internet) or how do i calculate volume, diameter & length of the port ?
Man that's hard to calculate because they don't usually offer full t/s parameters for coaxial speakers. I will say those types of speakers are made for free air/infinite baffle setup so they will require a large box to play deeper notes. They probably have a very high QTS value.
Hey! Great video, as always :) Have you considered looking into what changes when you have two ports with same tuning but different port air volumes?
What if you only have port as your box i.e tline or horn. I also have the same question as above, same tuning, same subwoofer, different box volume. So the only difference will be in the over all port area. There is so much to building a box lol I love it and hate it. I plan to do some debunking and theory on this subject some day. Appreciate your vids.
If both ports are the same tuning, then each port will do half the work, i.e. move 50% of the air each. So, the smaller area port, in order to move the same volume of air, moves the air at a higher velocity.
@@subdynoman Ah, same tuning, same subwoofer, different box tuning, only difference being area- area increases with box volume.
In regards to tline, horn, a ported box is basically the opposite of a horn, starts wide and ends tight. So, imagine a T-line has a set tuning, a port widening, i.e. a horn, has a higher tuning than the T-line, and a port narrowing, i.e. a bass reflex, has a lower tuning than the T-line.
Hoping this will clear things up a bit
Nice video
Thanks thanks and thanks!
there is no better! It all comes down to individual design! and sound application of what one wants to achieve .
!thanks for the exercise
can you recommend a program to draw a box and get a Hz respond.
Can folded horn make a 36 mm 2w speaker's sound louder ? I'm trying to make a simple one for a 36 mm speaker but I can't find a good diy
That's a huge port length I can't sacrifice my box volume for port! There are many guys using short aero port and have great results! Theory isn't as good as practical experiments! Trial and error will give better results I believe.
are Egg shape ports as efficient as circle ports? in terms of max Velocity before chuffing... I used a 3D printer to make a 3 inch x 4 inch circular port, the reason i have done that is to try to cut out as little wood as posible to keep the front baffle strenght maximum, but I also heard large area ports can sound bad, like you have mentioned sound like 1 frequency and boomy, so by limit it's size in one dimension it should keep the air flow tight... and more accurate, this is just my theory from what I have read online... that's why some people prefer slot ports because they sound cleaner, less compression, so the same principal here, im making the aereo port wider in one dimension... 3x4 inch, I could even make a 3x5 inch circular port to see if it sounds any better, to try and control the air better, without getting weird resonances or muddiness coming from a large diamter aero port...
hi, can you help me calculating port diameter and lenght?
150W 12" speaker 28hz
Got a cutting list for a DD 818D by some chance dude? 😜 I got a 147@42 but want that 150 under 40
I have 2 10 inch Americanbass xo1044 subs which are rated at 300 rms each. What size box and ports w
Would work best for heavy metal and old rap music?
I don't have the specs on those speakers but I would have to guess around one and a half cubic feet a piece with at least the 3-in diameter port that is about 7 to 9 in Long for each chamber
What is the diameter of the port tube?
How can you possibly estimate port length with no reference to its diameter?
well. u get a sub and like dude . I never use a software , just paper and formula but seems interesting
I always told myself the port diameter should be 1/3 of the driver size by twice the diameter length of the driver
Nice!👍 So the longer the port, the lower the bass?
؟
Yup. Go to a port length calculator online. Just Google it.
And play around just plug in some numbers and see how it effects your lengths
can you help me with a new custom box? i have 2 dd audio 615e sub woofers on a m2000 wired to .5 ohm so 3000 watts roughly? i currently have the subs and the port firing at the trunk lid and i believe due to the size of the box a lot of sound pressure is trapped into the trunk so i wanted to rebuild with the port firing towards the cabin of the vehicle my current box is roughly 27.5"L x 37.75"W x 16.5"H and a depth of 27.5" and is about maximum in box size i can possibly do as it touches the top of the trunk the bottom of the trunk and the trunks arms rub on the box so Im trying to increase low end SPL (35hz) or less current port area is 5.5"W x 15" H I have sound deadening but will add more during the box rebuild as i need it Im a huge fan of "the cars that go boom" so if you can maybe tune it in there if you know it that would be great any tips or tricks into if not its fine just doesnt hurt to ask
did the box dimensions wrong 37.75" L x 28" W x 16.5" H the depth is the width i brain farted
I build box 0.8cuft with port 16sq inch, long 20 inch for sub 8 inch. is it good? And what frequency does it play on?
the box would be tuned to around 44Hz which seems a bit high personally, if your box is big enough i would recomend trying to add an aditional 11 inches of port length so you would be tuned to around 36 hz or you can also do 7 inches to it to tune it around 38 hz, it would most likely sound better but i dont know if the box would be too small for your 8 inch sub at that point if you are adding a larger port wall it will decrease the subs useable box volume, the box im making is for my sundown x12 its 2.3 cuft before the port, and is tuned down to 32 hz so roughly a 39 inch port area usuing his equations where i found 34 inches to be closer using a different app. hope this helps
@@jordanlee1237 0.8 cuft net box, my port is out of the box, I've tried adding 12 inches to 32 inches, tune around 38hz, I feel there is no difference in sound for low freq, but Sound Pressure Level feels buried. but in the manual it says 45hz at 15 liters. ideal for an 8 inch subwoofer what is the box size and port diameter?
@@akuncrazy If the sub's resonance is 45Hz, it'll have trouble making the low notes, especially if the driver is stiff. One suggestion I could make is to aim the port into the corner of the room, try to get some corner loading to boost the lows a bit. Sounds like a reasonable suggestion from the manufacturer. If you're willing, could add blutac to the cone to lower the resonance, just be careful not to break it
@@Dakoustics
yes the manufacturer recommends 15 liter tuning 45hz with 80/1 flare, and 12 liter box selaed. but I don't understand what an 80/1 flare is, so I made a box 20 liter, port with a 4.5 inch diameter, 20 inch long (tuning approximately 47-50hz). well am i better to follow the manufacturer's advice at 45hz, or make a lower tuning say at 30-38hz?
And what is Blutac?
@@akuncrazy Since your box is already a bit bigger than the 15L they suggest, tuning lower should be fine. Also, Blutac is a sticky tar-like substance for sticking things together temporarily. I just put some evenly on the cone with the main goal of adding some weight to lower the resonance of the driver, so it works better at lower frequencies.
🔴I have a 8 cu ft gross ported box (with 15" kicker L7s 1000w) my port area is 17.5" x 4" equals to 70 in2 (or about 9 in2 per cubic foot). can someone tell me if my port is to small. i heard its supposed to be 12 to 16 inch squared per cu ft
Thats a rule of thumb yeah, but thats all it is, a rule of thumb. It also depends on the power you have, cone area, and the xmax of the subwoofer. If you got a big sub with a lot of power at it with s lot of xmax then a bigger port area will perform better and vise versa
Mazda protege 5 how big u need for 120in sub
Where's the link for WISd
I want to be heard and felt which port should choose I have a sedan trunk
check my page out
There's an oft mentioned joke back in the 1990s when it comes to bass reflex loudspeaker design that goes: "...if the port is any longer, it would be called a transmission line loudspeaker..." Needs more long-haired wool though.😆
Heh, my dad has told me stories of bass reflexes in the 70s, possibly 80s, with drivers so soft the boxes would be enormous, and as a result the port was just virtually a side missing from the enclosure, jeez audio has come a long way so recently
Don’t you need to deduct the volume of the port from the cabinet volume to get your real cabinet volume?
Yes.
🔴i play a lot of bass boosted music, at what frequency should i tune my box
Atleast 35 hz
Which one is better sealed or port
I like porled
For 8 inch wooder is 2 inch diameter round port good ?
It depends on the subwoofer's xmax or your tuning
7-9 inces you don't need fancy computer programs
Yes it’s perfect. Especially if it’s a precision port flared.
Couldn't this be done in a spreadsheet?
The only part of this video I don't agree with is that a ported box tuned to say 40 hz will not likely play to 30 hz. I think that's a bit misleading as I know many of my boxes tuned to 40-38 hz in car will be audible down to 27-25 hz with proper subsonic filter settings. For example the Rockford P3-2X12 prefab setup is tuned to 40 hz or slightly higher yet has in car response down 25 hz.
yeah, i just tuned my new built box to 40hz, because it would fit the driver better, but damn, it does under 30hz no problem!
How do you tune a new box? I just made a 3cf box with a 2.5”x15” port and it’s about 30” long.
You might be a nerd but your a good nerd. 320/tun f squared = port length in cm for a 16inch squared port per 1 cu ft of bass box internal volume... Even i get it.. Love the way you say bird box... Now i need to figure out slot port or port with any length... Already wishing my box was bigger.. Would you agree bigger is better in most cases??? Im thinking all the big boxes I've listend to are the best the small ones never so good in most cases
Can anyone give me their thoughts on 2 subs in a ported box with separate chambers with each side having a different tuning? Is there a name for that.
Generally I'd only suggest this if the subs had a crossover between them, so one did 20-40Hz, and the other one did 40-80Hz. Problem with overlapping is due to phases you can get cancellation, which means it ends up being louder just tuning 2 subs the same.
OR, it is also possible you just described a parallel 6th order enclosure, with 2 subs in it.
6th order Bandpass
If you put a 4ohm speaker in a sealed cardboard tube, just slightly larger than the speaker. The results are remarkable even with a low power amp.
I used a cardboard box with 2 @ 6.5 inch 3 way car door speakers to test a small LEPY Brand amp. Put foam around the speakers and it sounded actually really good for a 10 min job. I used 15 volt 500 ma power supply, but I recently found that I can use a 24 volt 5 amp power supply. Lol. It works if you're testing? And like me run out of MDF! Cheers from Australia 🙂
Port length should not exceed twice its diameter if serious pipe modes are to be avoided.
im doing a 35 cubic foot box right now with 13,000 watts going into it. port is like 4 feet long or so. i can climb in it easy enough
Wow thats why the jukeboxes always sound good speakers built-in 🔊 🙄 ❤😂
If your port starts looking like a small intestine (small box tuned very low), you might be better off with a passive radiator.
The "right" size of port does not exist. The port must be big enough to avoid "chuffing". That happens around to 17 m/s air velocity. The port area and tuning frecuency,will determinate the length of port
Just make it more aerodynamic to make it smaller, smaller port size makes it less boomy.
17m/s is actually still quite acceptable. Unless it's a 2 inch port... But the bigger the port, the faster it can get without chuffing. I'd say anything less than 20m/s is golden... (again, assuming that the port diameter is sufficiently large)
At 17m/s a 6 inch port does NOT chuff, I don't know who told you that it does, but it doesn't. It's windy, but it doesn't chuff.
A 2 inch port does chuff at 17m/s, but that is basic physics.
@@iterminator309 The chuffing happens at 17 m/s. The port size does not matter
@@fabianmolina866 oh, okay... If you say so.
From my experience...short port. No bends.
hey im gonna need u to design me a 6th order. I have the shell built in tahoe already.
It's not the length of the port but how you use it.
Airport 🛫
This 'equation' is useless, since you don't take the port's diameter into account. Changing the diameter makes a massive difference in length will maintaining the same tuning frequency.
Ye i lol'd at the equation. So stupid
Rock you want low too
My port can dock a titanic
if you are here, you dont want your ports to listen to good ol'rock, lol, so pls cut to the good stuff
ask girls..........short or loooooong
Division by zero error 🤮🤮🤮
This is just as stupid as asking "What is the best frequency"
Depends on your speaker and box mate how low can you go???? Only you know. But best believe low an't good unless its the right low
So, so wrong