You may be kerfing all wrong.

[Ninja_v1.0]

interesting.....

whats more interesting is that Terry Brocks just destoryed everything i read by posted the number he did with his huge port.

but then again I don't know shit so i stay in the shadows

that read recommended a large port. but at high spl it did not recommend a huge ext flare whcih he does have. but it also recommends an aero port which makes sense.

overall a great read though.

I am gunna put a lot of this to test once my meter comes in the mail!!

at least I have a large port and a curved port entrance on inside. i left the outside of the port unkerfed and straight though

i didnt read it

[Bump4life]

interesting.....

whats more interesting is that Terry Brocks just destoryed everything i read by posted the number he did with his huge port.

but then again I don't know shit so i stay in the shadows

that read recommended a large port. but at high spl it did not recommend a huge ext flare whcih he does have. but it also recommends an aero port which makes sense.

overall a great read though.

I am gunna put a lot of this to test once my meter comes in the mail!!

at least I have a large port and a curved port entrance on inside. i left the outside of the port unkerfed and straight though

This is the main interest of mine from this whole thing. How would a large kerf inside and no kerf outside compare to how everyone does it now, with a large kerf outside and not on the inside? There's definitely logic behind it. Or maybe large kerfs on both?

If you do any testing, please mention me wherever you post up!

will do. it has to do with fluid mechanics. I dont know much about it nor have I taken a course, but the article give a good basic understanding of the flow of air at the inlet and outlet to the port and how they differ which is why I am happy that I round over the inside because I have always had better results. then I will test the differences of kerfing or flaring the outside. Also if you can maximize area and minimize perimeter youll have better results since there will be less frictions with the side of the walls. gotta love the calculus

what i thought was interesting was that a rough interior can actually be better for airflow. I always thought smoother was better.

One thing to keep in mind is that this is ONE source. Id like to look into this more from other sources to confirm the findings before we change up the game.

[gckless]

interesting.....

whats more interesting is that Terry Brocks just destoryed everything i read by posted the number he did with his huge port.

but then again I don't know shit so i stay in the shadows

that read recommended a large port. but at high spl it did not recommend a huge ext flare whcih he does have. but it also recommends an aero port which makes sense.

overall a great read though.

I am gunna put a lot of this to test once my meter comes in the mail!!

at least I have a large port and a curved port entrance on inside. i left the outside of the port unkerfed and straight though

This is the main interest of mine from this whole thing. How would a large kerf inside and no kerf outside compare to how everyone does it now, with a large kerf outside and not on the inside? There's definitely logic behind it. Or maybe large kerfs on both?

If you do any testing, please mention me wherever you post up!

will do. it has to do with fluid mechanics. I dont know much about it nor have I taken a course, but the article give a good basic understanding of the flow of air at the inlet and outlet to the port and how they differ which is why I am happy that I round over the inside because I have always had better results. then I will test the differences of kerfing or flaring the outside. Also if you can maximize area and minimize perimeter youll have better results since there will be less frictions with the side of the walls. gotta love the calculus

what i thought was interesting was that a rough interior can actually be better for airflow. I always thought smoother was better.

One thing to keep in mind is that this is ONE source. Id like to look into this more from other sources to confirm the findings before we change up the game.

Yep, same here about the rough interior. This paper contradicts a couple things that are common thought, which is why I like it.

But of course more sources would be good, and necessary for other people to believe and actually adopt this. That's basically any new thought process though, especially one that goes against the current norm. Either way, I'd love to see some testing

[Maxim]

interesting.....

whats more interesting is that Terry Brocks just destoryed everything i read by posted the number he did with his huge port.

but then again I don't know shit so i stay in the shadows

that read recommended a large port. but at high spl it did not recommend a huge ext flare whcih he does have. but it also recommends an aero port which makes sense.

overall a great read though.

I am gunna put a lot of this to test once my meter comes in the mail!!

at least I have a large port and a curved port entrance on inside. i left the outside of the port unkerfed and straight though

i didnt read it

[Krakin]

It's a freakin' AES paper, didn't notice that the first time I glanced through it.

And in the summary this is the site that was referred to with the graph.

http://www.subwoofer-builder.com/flares-25mm.htm

[gckless]

I came across that paper a while ago, but I haven't found the time to read it just yet. I really need to.

Was doing some searching and came across the flared vs not flared test you did. Those were external flares correct? Did you ever test inside flares?

[Triticum Agricolam]

Was doing some searching and came across the flared vs not flared test you did. Those were external flares correct? Did you ever test inside flares?

When I did that test I'm pretty sure I flared both the outside and inside ends of the port. I've gotten some larger roundover bits since then, I'd be curious to see how a larger amount of flare would make a difference.

[gckless]

So I'd like to test some theories in this white paper in my next build. Will be a pair of 15" TRF/SHD hybrids (blacktop TRF motors, SHD top assemblies) on a DC 5k. I'll be using a single 12" Sonotube with bellmouth flares. Still need to figure out where to get the bellmouths.

So the paper says a large radius flare on the inside and a small radius on the outside is good for high power, and that is what I'll be doing I think. What exact sizes, I don't know. I'm thinking 3" radius minimum for the inside, up to 6". For the outside, maybe 1.5"?

Any thoughts? Is the small radius flare on the outside just no good, and I should do a larger one? While I would like to test this, I want this to be my setup for a while.