Gonna make a new enclosure

[SQBubble 10+ year member]

43.75 to be exact

 

[SQBubble 10+ year member]

and you have no bracing in that big *** thing?



maybe if you brace it it may help.

that is wut I think it is, but since ill be making a new box(better made, brace and all ), 4.3net @31hz with 67.5 sq.inch of straight port should be enough for no noise? or i could do 4cu.ft NET @35hz with 81sq.inch...

 

[saywhat? 5,000+ posts]

do 4.3 with 82 s inch at 50 hz, and plug it for 30 hz with 67.5 or whatever it would need to be and it would be teh wangeth.

atleast ill be doing something similar, a bit smaller though.

 

[iamamp3pimp 5,000+ posts]

why 50 HZ?

he wants more lows.

lol

 

[SQBubble 10+ year member]

why 50 HZ?
he wants more lows.

lol

LoLz

i had an old box (first one) 2.9NET @ 49hz , spl monster, still sounded nice when u eq a bit, cuz of the woofer I guess, NO air noise I was aware of even with the lows, it just bottom out so easily and lose lot of output below around 37hz-40hz...

that was with 15.5 x4 (62sq inch of straight port, moved LOT OF AIR)

 

[SQBubble 10+ year member]

so... any thoughts?

4.3@31 w/67.5sq.inch?

or

4@35hz w/81sq.inch?

or

4.1@33hz w/74.25sq.inch?

 

[xluben 10+ year member]

why didn't you do an l-shaped port:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=38&Eh=15&Dia=9&Xmax=23&Vd=.12&NumW=1&Vb=3.8&Fb=31&Qts=&Vas=&Fs=&CE=0

how's this one:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=40&Eh=15&Dia=9&Xmax=28&Vd=.12&NumW=1&Vb=4&Fb=31&Qts=&Vas=&Fs=&CE=0

or is that way too big?

 

[SQBubble 10+ year member]

I don't like L-Ports, they waste space imo .

I have a labyrinth right now, its the biggest box I can put, I could add 1inch more in width

That is why, straight port seems like the easiest and save the most space and would have the least turbulence. Im debating on how much sq inch should I make and why do I have port noise on low notes...also, does too big of a port make port noise?

 

[xluben 10+ year member]

I don't like L-Ports, they waste space imo .
I have a labyrinth right now, its the biggest box I can put, I could add 1inch more in width

That is why, straight port seems like the easiest and save the most space and would have the least turbulence. Im debating on how much sq inch should I make and why do I have port noise on low notes...also, does too big of a port make port noise?

how do you figure?

just look at these two boxes:

labyrinth:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=38&Eh=14&Dia=6&Xmax=23&Vd=.1&NumW=2&Vb=4&Fb=30&Qts=&Vas=&Fs=&CE=0

l-shaped:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=48&Eh=14&Dia=6&Xmax=23&Vd=.1&NumW=2&Vb=4&Fb=30&Qts=&Vas=&Fs=&CE=0

they both have the same net volume, tuning frequency, port area and port length.

since both ports have the same lenght and area they will displace the same amount of air. to finish off the port displacement you need to look at the teal and violet pieces. the difference in displacement ends up being 0.008 ft^3 (due to the wood used to make the port). which is pretty negligiable.

BUT:

a 180 degree turn is gonna cause a lot more turbulence than a 90 degree turn. and therefore increase the chance of port noise. most people that do labyrinths use rouned edges and 45's in the corners to help ease airflow.

a straight port isn't going to save you much more space (if any) and i don't see how you plan on getting a large (port are) straight port to fit into the same box that you're using a labyrinth in now.

 

[SQBubble 10+ year member]

dimensions right now is :

Gross(inside)

width: 37(35.5)

height: 15(13.5)

depth: 23(21.5)

with 43.75" of port length.

67.5sq inch of port

makes 4cu.ft@30hz

straight port

add 1" to the width

and I can squeeze out

4.5cu.ft@31hz w/67.5sq inch

...

w/81sq inch

I can do 4.2cu.ft but @ 35hz

 

[PowerNaudio 10+ year member]

when calculating port area dont go beyond the nesesary going 10% bigger is cool. but anything bigger, it just a waist, since that will mean that youll need a longer port and it will need a bigger enclosure to fit it.

so just go big enogh to not have port noise +10% to stay safe. and you should be good to go.

anything bigger is just a waist of wood and space.