the elephant box is on the way

[nineballsafety8 10+ year member]

whoa there buddy... i was trying to be funny. sorry if i offended you, and yes BJ does beautiful work. i would much rather PAY him to do it than spend the same amount on materials to get it right... kerfed ports are new to me and i wouldnt make my first attempt at them in this install. but no... im not a noob. and a little FYI, its kinda hard to build a box in downtown Baghdad when you are taking mortar fire.

 

[bjfish11 5,000+ posts]

When building a box like that how do you make the large roundover parts? I'm referring to the very outside flare of the port...how exactly do you do something like that?

and if you search some of BJ's other builds, he has done quite a few with that concept

Its called kerfing, its actually bending of the material...

Do you have any idea what the box is actually tuned to? Flares on both ends of the port, one into infinite space, and two ports converging? Or you simply gonna build it and cross your fingers cause it looks cool when modeled in sketchup?

I would guess Chris could tell you within 1-2 hz what its tuned to //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Are you going there or is he coming here?
It looks like BJ will have plenty of "tricky kerfing" experience by the time he builds my box, although mine looks easy compared to this.

//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Awesome man, always love new projects...

Bj you have really out done yourself this time man that is one insane box 260lbs without the subs DA*N . gl with the build man be sure to keep us update with pics and progress amazing start so far man //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif.

Ill be sure to take plenty of pics.... //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[ItalynStylion 10+ year member]

Nineballs....where in TX are you? I'm in the DFW and if you're close I would love to see this box in action //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[bjfish11 5,000+ posts]

Nineballs....where in TX are you? I'm in the DFW and if you're close I would love to see this box in action //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Kileen possibly? I think.... //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[nineballsafety8 10+ year member]

right again BJ... yeah i live in Killeen, but wont be back in texas until April of 09... i come home for a few weeks in april or may, but my truck is in IL at my parents house and i will be going there to finish the build.

 

[Dtrickz 10+ year member]

that box is gonna be killer man. BJ does excellent work

 

[Relax 10+ year member]

I would guess Chris could tell you within 1-2 hz what its tuned to //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Before or after the build? I could determine its tuning after the build, but I do not know of a way to estimate it before the construction begins. Could use some instruction if indeed there is a way.

 

[IonSQL 10+ year member]

There's nothing special about the type of design other than the flared ports.... the single port in the center is nothing new

 

[Relax 10+ year member]

I know its not new. but do you have any idea how the flares and the two seperate ports combine to alter the tuning of the box? Its not just addition and subtraction anymore.

 

[Relax 10+ year member]

I know its not new. but do you have any idea how the flares and the two seperate ports combine to alter the tuning of the box? Its not just addition and subtraction anymore.

My bad, the new design later in the thread is one large port with flares. But still, how does the flare effect tuning?

 

[IonSQL 10+ year member]

I know its not new. but do you have any idea how the flares and the two seperate ports combine to alter the tuning of the box? Its not just addition and subtraction anymore.

Why isn't it? The port still has a length and an area, and it's still easy to calculate the exact airspace.

The box is 8cf net tuned to 40Hz

My bad, the new design later in the thread is one large port with flares. But still, how does the flare effect tuning?

Doesn't affect tuning if it's correctly measured, just as an aeroport doesn't affect tuning if done correctly

 

[Relax 10+ year member]

an aeroport is round, therefore the cross sectional area is the same. with your design the port is only flared on the two sides, and the cross section is different. If you took the flares into account some way, no problem. I was just curious as to how you calculated the tuning. In any case I am sure the flares won't move the around that much, probably less then the effect the estimated volume of the speakers would effect tuning.

I just had a large problem with the original photo that was linked. The new one looks much better.

 

[nineballsafety8 10+ year member]

should be quite interested... hey chris, you get the revisions to bj? not that they were very different anyway

 

[nineballsafety8 10+ year member]

^interesting... sorry typing too fast

 

[JimJ 5,000+ posts]

CNC layercore > kerfing //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif