6th order subwoofer vs. WinISD
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- čas přidán 20. 02. 2020
- In this video I make an attempt to visualize the results from WinISD speaker modelling software. Some paper strips and few bass sweeps were used to do the demonstration
If you are interest in box plans, please let me know down in the comments - Věda a technologie
Good nerd out video. I been thinking about making a video on this. win isd is pretty accurate to get you in a good ballpark.
Yep, WinISD is a great help! But precise speaker data input is a must. Have stepped on that rake many times
@@KarlisZalitis yea the parameter inputs are touchy
What circumstances would you choose 4th, or 6th order over a traditional Cheby-Chev ported enclosure or similar setup using PR's? I'm a Home theatre person not car audio for context :)
Hey! I guess one of the main benefitsis driver control in passband region - from what I've read, the less cone moves the less distortion. Also this helps to protect the driver from mechanical damage. Better loading allows for bigger boxes thus more effective output. But all of this has to be balanced with port size to avoid ringing or Air turbulence. And yes, usually bandpass boxes are bigger. In short - it depends :D
Hello. What will happen if i made the front camber tuned on higher frequency and the rear camber tuned for lower frequency. Ex. 70hz for the front camber, 40hz for the rear camber?
40/70 tuning seems to be just fine :) But chamber volume also is important. You can play around with box responses using winISD, it's easy to use and free :)
Should the port areas be relative to the size of each chambers?
From what I have read, the port area in cm^2 divided by volume in liters should be at least 3,6. But this depends on many other aspects - shape of the port, cone displacement volume, available space etc. Also - the port should be as big as possible, but I keep the air velocity above 16m/s. There will be soon a video, where I take a deeper dive explaining ports for my latest subwoofer build
You should really do a video about port areas because there's no videos on CZcams explaining it in depth. I'm building a parallel tuned 6th order for a skar ddx 15. Skar recommend 64 square inches of Port area for 4 cubic feet of box space, which is what my low chamber would be. The high chamber would be half of that size which would be 2 cubic feet. Should the port area for this chamber also be half of the port area of the low chamber?
Did some quick math, Skar seems to line up with the 3.6 coefficient I mention earlier. The short answer - yes, for the smaller chamber half of the port area should be fine. But this comes with many asterisks :D Have you tried to plug the numbers in WinISD?
I will try it, thank you.
Man, this is not fun.....this is very interesting ! I never check this things and I ve made a lot of subs. Very nice presentation ! 😇
PLEASE TELL ME: what is the difference when we have both ports in the same part of subs and when the ports are oposite? L-Acoustic made Sb18M with both ports in the same part but other brands (like KV2, Makie, Norton, etc) made subs with ports in oposite, like yours. Why?
Supongo que esto será para tener un menor rango de error a la hora de fabricar un cajon de sexto orden, ya que con los puertos individuales se evita totalmente el cortocircuito acústico evitando que se cancele el sonido, incluso hay diseños con ports individuales donde un port queda al frente del cajón y el otro queda en la parte trasera del cajón, lo cuál personalmente me parece mas ideal ya que logramos un sonido mas expansivo evitando que las ondas de sonido positivas que salen de un port se encuentren con las ondas negativas que salen por el otro port...
I'm not sure, but I guess from acoustics standpoint for subwoofer frequency range it should not have any noticeable difference if the ports are separated or next to each other. But I could be mistaken. My gut feeling says that they should be separated, but it's only that, a feeling :D Other reason why my ports are on opposite sides is that I wanted to avoid 90degree turns in ports. This is an interesting topic to be honest
@@KarlisZalitis yes! I made a lots of tests and I feel the best frequency coupling when the both ports are in the same part and no distance between them. L acoustics made something a little more intersting whem they put both ports in a little common space(like 5-7 cm coupling port) . So, in the SB18M the both ports don t go outside directly. They are opnened in a PRE OUT port that sum both .
Interesting! I will do some tests too,, to prove to my gut it was wrong :D
Whats the plans for the box
If you're interested, send me an email - kzdesignlv@gmail.com :)
Is that house wiring?
It's the HiFi lossless fine strand tripple earthed house wiring. :D
Wire Ports should be at the back of box.
Why?
That air velocity is very high
Yes, that is correct. Working on laminar ports for my future projects
Hz?
Yes? :)
@@KarlisZalitis i am from brazil... i speak only the basic of the english
I want know
33hz? 28hz?
@@KarlisZalitis how many hz
Oh, the tuning? It's 31Hz for the low tuned chamber and arround 70Hz for the high tuned chamber
Sound better without the paper...sounds like it has gas...💨
You should hear it full crank in my Jeep - sounds nice :D
the graphics don't look balanced! and the air velocity over 17m/s make a noise! cheers.
Yep, you're right - this was only my second attempt at 6th order box, so the tuning is a bit off. And also at high volumes there is a little bit chuffing in ports