My first Ported box *pix*

[rpfuror 10+ year member]

I'm here, just don't believe that it is necessary to explain... the numbers work for the port and gross volume and the box preforms well what else would you like to know? If I get a chance today I'll draw up a 3d drawing that shows the "theory of operation"

 

[BrianChia 10+ year member]

how do you calc port area with a box like that?enlighten me

Length * width of port.

 

[skadude016 5,000+ posts]

Length * width of port.

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[PV Audio 5,000+ posts]

I just cannot see how that box doesn't have huge turbulence issues. Think about it: if you tell a bunch of people to run through a tunnel, they'll easily go out the other side. If you tell them to run through a tunnel with a wall at the end, and the only way to exit is to go up, nearly everyone will run into the wall and then will be forced through the opening by compression. If the design works, it works. I still don't see how it could be calculated though.

 

[PurposeSoap 10+ year member]

Length * width of port.

I know this

but the port opening looks smaller then the port is inside the box,apparently it's the same according to the builder/designer

I still dont understand why its built like that? You could have designed the port to have less turbulence while maintaing the same port area... and length..etc.

Why was this design choosen over one with less turbulence? You still have to cut the same wood and do the same amount of work, but someone choose a outlandish design.

I ask because you can argue all day this design works, but the smartest people with the latest and greatest equipment will NOT run a port design such as this build.

 

[skadude016 5,000+ posts]

yup.... with the design like this there is no real known direction for the air to flow. The tuning and port area will be thrown off

 

[Chevyaudio 5,000+ posts]

I just cannot see how that box doesn't have huge turbulence issues. Think about it: if you tell a bunch of people to run through a tunnel, they'll easily go out the other side. If you tell them to run through a tunnel with a wall at the end, and the only way to exit is to go up, nearly everyone will run into the wall and then will be forced through the opening by compression. If the design works, it works. I still don't see how it could be calculated though.

we have a winnar.

Port design is all about reducing turbulance and creating a smooth path for air flow. That final turn (which its not a turn, you just merely opened the baffle up over the port) is causing compression like lemans said.

 

[SplChoice- 10+ year member]

thats just a poorly designed box, why make it that complicated when u coulda used the depth wise of the box and ran it like a normal slot port..but you chose i dunno lol good build poorly designed.

 

[DBfan187 5,000+ posts]

Your sealed box has a hole in it.

 

[diminishedpower 10+ year member]

first it still has less terbulance cause it has 2 turns compared to some people who use skinny *** ports, or the ones that loop back and forth, but they dont get sh*t about it haveing turbulance?

 

[PV Audio 5,000+ posts]

first it still has less terbulance cause it has 2 turns compared to some people who use skinny *** ports, or the ones that loop back and forth, but they dont get sh*t about it haveing turbulance?

No, not really. Either way, to make a fair comparison, let's compare this design to an equivalent design with the same port area. Let's also consider that it's a labyrinth port as well. There will be some compression in this port if the port area is not large enough; that's a given. However, the air can still escape readily from the other end because it's a linear flow from one location to the next. The issue with this box is that when the speaker moves, the air from the rear of the cone will be pushed down the port as normal, but it cannot continue it's flow because it meets a wall. Instead, the air will be forced through the hole in the top of the box by air compression. Because this is the only way to have the air escape, it is by default far more inefficient than an equivalent "orthodox" vent design.

 

[iagrdshaka 5,000+ posts]

I'm here, just don't believe that it is necessary to explain... the numbers work for the port and gross volume and the box preforms well what else would you like to know? If I get a chance today I'll draw up a 3d drawing that shows the "theory of operation"

please do tell....//content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[lilmaniac2 5,000+ posts]

LAWL, got to love ppl who dont know how to design a box.

Thats Definately not a HixBox

cH

 

[mazdakid 5,000+ posts]

LAWL, got to love ppl who dont know how to design a box.
Thats Definately not a HixBox

cH

//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[dcole18 5,000+ posts]

ive seen a box like that one time and it had crazy port noise... sounded like ***, but i hope your right and yours dosent sound like that... good build quality for the first build though...