Are all flared vents created equal? (1 Viewer)

[jeff lam]

I have decided on my tempest sonotube design.

175L, 18" sonotube, 45" length w/1.5" endcaps, 64oz polyfill, (1) 4" flared port 13" long tuned to 17.5Hz. Dan has helped me with this design. My question is, are all 4" flared vents the same? I could buy the Adire kit, the Lightning audio kit or the PE aeroport kit. Should I just go with the cheapest one? Is one stronger or better than the others? I have never used a flared kit before so I have no idea.

Thanks!

 

[Jack Gilvey]

Lightning Audio = Aeroport, and I believe that's what Adire sells, same as PE. I think there's another one Madisound sells, not made by Aeroport, but it's the same. I have a couple that don't say "Aeroport", I think I got them from Madisound a few years ago.

 

[Mark Hayenga]

The Madisound ones are a little different - they come with screw holes pre-drilled and a little texture along the rim of the port. I use them b/c they're a little bit cheaper and there's no real performance difference.

 

[Jack Gilvey]

Thanks, Mark, those are the ones I have, with the drilled holes.

 

[Mike Dr]

jeff, just wondering, what made you decide on that particular configuration? LspCad seems to suggest a larger volume.

 

[jeff lam]

Mike,

The EBS design calls for 10ft^3, that would make the sub about 7ft tall. I want to draw attention to it but not THAT much attention. I think you were the one that found the design I am doing if I'm not mistaken. You had asked about it a while back when you found another post by Dan W. This is also the same design that Hank built and he said it is very good.

I wanted to go with the EBS design but it was just too big, and everyone convinced me that a tempest would be best instead of a shiva so this is my only option. I have Dan's blessing for this design and since he designed the driver, I will trust his enclosure design. I'm sure I will be blown away once I hear it so I'm not to worried about not doing the EBS.

 

[Jack Gilvey]

Jeff, my approval of Dan's design is certainly superfluous, but that looks like an excellent alignment to me fwiw. In-room, it looks to have a flatter response and lower group-delay than a design "optimized" for a specific frequency. As I've said before, don't worry about the "optimize by frequency fit" function in LspCAD as it appears only to attempt to maximize output at the chosen frequency w/o regard to other aspects of the design.

 

[jeff lam]

Jeff, my approval of Dan's design is certainly superfluous, but that looks like an excellent alignment to me fwiw. In-room, it looks to have a flatter response and lower group-delay than a design "optimized" for a specific frequency. As I've said before, don't worry about the "optimize by frequency fit" function in LspCAD as it appears only to attempt to maximize output at the chosen frequency w/o regard to other aspects of the design.

Jack, so does this mean you approve also?
Once I read the design and Dan's comments on it I figured it was almost exactly what I was looking for. A low tuning, a pretty flat response, high output, all in a small package(well smaller than EBS I guess).
BTW, what's superfluous? when you use words like these you tend to loose us tech school guys as we didn't have many English classes in College. Also, what does FWIW mean, I think I knew at one point but I forgot. I must be working too hard.:frowning:

 

[Brian Bunge]

Jeff,
From dictionary.com:
superfluous - being beyond what is required or sufficient
FWIW=For what it's worth
Sounds like your thinking about speakers too hard, not working too hard!

 

[Mike Dr]

Jeff - keep us all posted on your progress. My tempest is coming in a week or so, and by then I'll have my brand new digital camera (Canon G2 .. woohoo) to document the process. I'm thinking of actually going with a slightly bigger enclosure.. maybe about 214 liters or so
good luck!

 

[Jack Gilvey]

Jeff, yes, I like it. What I meant by "superfluous" is that my OK would hardly be required for a design signed off on by Dan W. He's forgotten more about this stuff than I'll ever know.