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View Full Version : L-port vs. "zig-zag" port...



jeepintn
08-30-2006, 05:37 PM
is there any audible difference in an "L" shaped port or a "maze" type zig zag port? is there any difference in how u measure for them? i.e. center line...

lilmaniac2
08-30-2006, 05:39 PM
only diff i ever seen is sometimes its more effiient use of space if u do the zig zag vs a l shape.. alot depends on port area and width of box

iamamp3pimp
08-30-2006, 06:43 PM
zig zag/maze is called a labrynith, and they are harder to design, but not by much. the more turns, the more turbulence...as we all know, air is like water, and it likes to follow the path of least resistance.

jeepintn
08-30-2006, 10:27 PM
well, the reason i am asking is i have designed my box to have two ports, each 34.5 inches long, with the box only being 30 inches deep and 39 inches wide. after correction, etc, there will be an are of about24 inches between the innermost part if each "L" shaped port... and if i went with a labyrinth, there would be much more room there... jsut didnt know if it would be worth going through the trouble of doing it that way, but i think 24" should be enough

iamamp3pimp
08-30-2006, 10:52 PM
yeah 24 inches is more than enough.

knotslck
08-30-2006, 10:55 PM
L > zig zag from what i understand.

iamamp3pimp
08-31-2006, 12:51 AM
I agree. Less turns = less turbulence.


not that you really notice any of it though

jeepintn
08-31-2006, 08:43 PM
ok, yesterday, i was adding wrong, i dont know what i was doing. there will actually be 15" of width between the ends of each "L" port... is that enough?

heyman421
08-31-2006, 08:45 PM
some people seem to think more tuns = less speaker slop (ie; the turbulance causes more pressure inside the box)

i don't know if there's any truth to that or not

iamamp3pimp
08-31-2006, 09:30 PM
whats the witdh of the port again?

jeepintn
08-31-2006, 09:33 PM
its 4" wide... and the elbow part will be 8.5" long each wide, so a total of 12.5 each side coming in... which would only leave 14" between the ports, being that the box is 39" wide

PowerNaudio
09-01-2006, 01:37 AM
you will be ok with at least 8" gap between the two ports.

the labyrinth enclosure wich is also know as a TL enclosure uses a difrent tuning equation
The length of the line is calculated Using:

v
λ=------
f
where:
λ = wavelength in metres
v = velocity of sound in long-haired wool = 330 0.85 m/s
f = the resonant frequency of the woofer = "35Hz example"

330 x 0.85
λ=---------------- =8m
35


but im sure thats not what you had in mind.

and you calculate your port in this maner.
http://www.xtant.com/html/images/ventCalc.gif

im not 100% on this but. adding 180* bends to the port will slow the air down. the more folds you add to the port the lower your tuning freq will be from the calculated value. how drastic of a change this is im not sure.
laters

jeepintn
09-01-2006, 07:26 PM
you will be ok with at least 8" gap between the two ports.

the labyrinth enclosure wich is also know as a TL enclosure uses a difrent tuning equation
The length of the line is calculated Using:

v
λ=------
f
where:
λ = wavelength in metres
v = velocity of sound in long-haired wool = 330 0.85 m/s
f = the resonant frequency of the woofer = "35Hz example"

330 x 0.85
λ=---------------- =8m
35


but im sure thats not what you had in mind.

and you calculate your port in this maner.
http://www.xtant.com/html/images/ventCalc.gif

im not 100% on this but. adding 180* bends to the port will slow the air down. the more folds you add to the port the lower your tuning freq will be from the calculated value. how drastic of a change this is im not sure.
laters

dang. thanks for that info man. thanks A LOT.

iamamp3pimp
09-01-2006, 10:02 PM
thats cool.

PowerNaudio
09-02-2006, 07:51 PM
dang. thanks for that info man. thanks A LOT.

anythime! if i have the time! lol
laters