Started building the Tritrix...

[PV Audio 5,000+ posts]

Very creative and unique. //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif

 

[Spud2388 10+ year member]

I'm hoping to finish up the other cabinet tonight. I'm trying to take some pics as I go. I have it wrapped as of now, just have to start forming the metal and touch up a few things.

 

[adio 5,000+ posts]

why wouldn 't u wanna use 8"s instead of 5.25"'s?? and what are they tuned to?

 

[Spud2388 10+ year member]

why wouldn 't u wanna use 8"s instead of 5.25"'s?? and what are they tuned to?

Well, i've been told larger speakers have more trouble producing quality sound at close ranges; forgot how people were explaining it, but made sense at the time (maybe the off axis response isn't as good as smaller drivers?). And these speakers will be listened to at a somewhat close range, about 3-4 ft. not sure what they're tuned to. just plans off partsexpress.

 

[PV Audio 5,000+ posts]

why wouldn 't u wanna use 8"s instead of 5.25"'s?? and what are they tuned to?

Well, i've been told larger speakers have more trouble producing quality sound at close ranges; forgot how people were explaining it, but made sense at the time (maybe the off axis response isn't as good as smaller drivers?). And these speakers will be listened to at a somewhat close range, about 3-4 ft. not sure what they're tuned to. just plans off partsexpress.

When you play a speaker, it not only relies on the baffle to separate the wave from the front and back of the cone, it allows it to disperse the sound in a spherical pattern. The larger the cone, the larger this radiation effect is. However, the smaller the baffle, the smaller the effect is. If your baffle is not large enough, you get a phenomenon known as beaming, which is where the sound is literally linear, and anyone not sitting directly in front of the speaker will have poor audio reproduction.
Imagine that instead of sound, the speaker is actually a baloon being inflated from the baffle. The sound aka the baloon will continue to increase in volume regardless, but to maintain spherical dispersion, it must increase its radius across the baffle. Once it hits the edge, that volume must extend outward in a cylindrical fashion. In calc terms this is a simple related rates problem where you're tracking dr/dV as the radius function increases (but let's not go there). You can combat this effect by rounding over the edges, but it's still not sufficient. Someone with more knowledge please critique this, as it's only my understanding.

 

[adio 5,000+ posts]

ummmmmmmmmm...........//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[Spud2388 10+ year member]

yea that kind of confused me too.... lol

 

[96civ 10+ year member]

It makes sense what he's saying. Somebody posted the dispersion of sound from a line array, maybe finding that post on here would make his explanation make more sense. I remember doing related rates in calc lol. dr/dV, in this case, would equal 2pi * r * dh/dV, correct?

 

[PV Audio 5,000+ posts]

ummmmmmmmmm...........//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

yea that kind of confused me too.... lol

How about this instead: what I just posted is one of the reasons why people use line arrays instead of large drivers. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[PV Audio 5,000+ posts]

It makes sense what he's saying. Somebody posted the dispersion of sound from a line array, maybe finding that post on here would make his explanation make more sense. I remember doing related rates in calc lol. dr/dV, in this case, would equal 2pi * r * dh/dV, correct?

Dunno, I'd have to think about it, which I'm NOT going to do //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[PV Audio 5,000+ posts]

And no, if what you said is correct, it would be 8/3pi*r^2. Think of it as a differential instead (ever do one of those problems where you have to paint a baloon that keeps expanding, and need to know your margin of error?), that usually makes it easier.

 

[96civ 10+ year member]

Oh.. I dr/dV'd the equation for a cylinder instead of a sphere.. whoops.

 

[hasa68mustang 10+ year member]

**** the one you finished looks awesome!

 

[Spud2388 10+ year member]

**** the one you finished looks awesome!

appreciate it. I have been slacking on the second one. I ended up being 10 screws short, an i haven't been to Lowes to pick some up. I have all the pieces bent and ready to be screwed in, but no screws. Hopefully i can pick them up sometime tomorrow and finish these things up. I took some somewhat step-by-step pics of the second cabinet, so i will get them thrown up tomorrow night with the completed pics of both of them together.

 

[Spud2388 10+ year member]

well, heres some completed pics.