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Topic Review (Newest First)
11-10-2012 04:18 PM
codyjenkins211
Re: How to: NET Enclosure Volume/ Slot Port

Ive been trying to figure out how to find port displacement, then take that out of total volume, and all that stuff. caused a real headache. your post was a real time saver
05-19-2012 10:38 PM
Robsmokey
Re: How to: NET Enclosure Volume/ Slot Port

HEY new to the forum.
get my jeep on the road in 18 days, have a capacitor, wiring kit, 6x9's, JVC deck, two 10" Sony xplod woofers. 330w rms. A boss 1600w 2 channel mosfet power supply amp. Runs stable at 4 ohms, also the amp is 400w rms per channel. I needa build my box and buy my 6.5's for my back doors. Im 16 by the way, first system... last forum i was on people were rippin on me about how there sony, and how i mixed sony with boss. I really dont care, it will all run together just fine and im just looking for help on the box... not the subs or amp.

ANYWAY,

i need help with a box, i want it to be ported. So it will feel loud and be heard coming. Obviously its not gunna hit like a type R , or anything competition grade. But id appreciate it if someone who knows how to build box blueprints to a perfect scale, & wanna help me out id appreciate it. Also i can post all of the parameters... i plan on making a thread... but i had to post something before i could do that


THanks guys.

Sincerely Robert
03-16-2011 06:41 PM
grandprixpunch
Re: How to: NET Enclosure Volume/ Slot Port

Thanks! I found one I downloaded on my p.c., it just reads box tuning calaulator, Worked great! I got 1 15" Fi BL tuned to 34.5 hertz, running off a Punch 1000. I am looking for another 15" around the same specs to run off my T1000, I got the room!
03-16-2011 05:17 PM
Fallen
Re: How to: NET Enclosure Volume/ Slot Port

Quote:
Originally Posted by grandprixpunch View Post
Thank ya'll sooo much! New @ making my own box!!! I have a Fi BL running off a punch 1000 want the box to be 30"w X 15"d X 17" h, looking to see how long the port should be!
Try winISD



03-16-2011 12:33 PM
grandprixpunch
Re: How to: NET Enclosure Volume/ Slot Port

Thank ya'll sooo much! New @ making my own box!!! I have a Fi BL running off a punch 1000 want the box to be 30"w X 15"d X 17" h, looking to see how long the port should be!
03-13-2011 10:58 AM
Fallen
Re: How to: NET Enclosure Volume/ Slot Port

Quote:
Originally Posted by kensaudio99 View Post
Good stuff.. I have re-reading this over and over. Does anyone here knows how to build clamp shell and how-tos calculate..
With google sketchup you can calculate the volumes of strange shapes.

Either that or break it down into easy pieces and do it by hand.



03-12-2011 05:00 PM
kensaudio99
Re: How to: NET Enclosure Volume/ Slot Port

Good stuff.. I have re-reading this over and over. Does anyone here knows how to build clamp shell and how-tos calculate..
02-09-2011 02:51 PM
sniper_rs
Re: How to: NET Enclosure Volume/ Slot Port

gracias por toda la informacion es muy buena y estoy aprendiendo mucho con vosotros, perdonar por los fallos pero estoy usando un traductor por que soy de espaņa y entiendo poco el ingles
12-09-2010 05:43 PM
Fallen
Re: How to: NET Enclosure Volume/ Slot Port

Quote:
Originally Posted by Shisimona View Post
Thank you so much. I've been looking for something this for the box 2 days now. This has helped out so much. Now off to build my box.
Make sure you post some pics when you're done!
Ideally in the build log section.(you might need to make a few more posts before you can start your own thread)



12-09-2010 05:19 PM
Shisimona
Re: How to: NET Enclosure Volume/ Slot Port

Thank you so much. I've been looking for something this for the box 2 days now. This has helped out so much. Now off to build my box.
11-20-2009 11:46 AM
realdchild
Re: How to: NET Enclosure Volume/ Slot Port

Thanks for the tips
07-25-2008 03:39 AM
wilj24 what about square ports, i tried looking at http://www.carstereo.com/help/Articles.cfm?id=31 , but i dont have a clear idea of what hertz are, can anyone help
07-20-2008 11:55 AM
slowEF Nice write up! Thank you.
06-06-2008 04:43 AM
D3CIBEL
Spl

Explaination with diagram will be very appreciated, i'm still confused about where to start to measure the start of the port
05-31-2008 08:41 PM
ndstrctbl
Quote:
Originally Posted by ranmansnaple View Post
about the round port so is that example port 6 inches tall by 6 inches wide and you figure it 3.14x3"x3". or is it really just a 3" pipe
the formula to find the aera of a round port is (Pi times radius times radius). the diameter is 6", and half of that is the radius which is 3". so it looks like this:

3.14x3x3.

then to figure out the displacement you times it by the depth and divide by 1728.

so, no it is not a 3" pipe, it is infact a 6" pipe.
05-31-2008 03:42 PM
ranmansnaple about the round port so is that example port 6 inches tall by 6 inches wide and you figure it 3.14x3"x3". or is it really just a 3" pipe
05-31-2008 02:58 PM
kensaudio99
Quote:
Originally Posted by Fallen View Post
I usually wait till Christmas to tune my boxes
Otherwise it will adversely affect its response.

haha

xmax :P

And xmax has little to do with port velocity. Motor strength has more to do with it.

Think about a pro audio sub...they have less than 10mm xmax...but they need large ports to keep the port velocity down.

Look at it this way: The driver moves the LEAST when the port is at tuning and is moving the MOST!

uhmm, You saying that it has nothing to do with the volume enclosures? Let say an Re audio xmax is 22 so how big do you thing the port should be? Sorry I'm kinda new to with enclosures, but I'm here to learn.
05-24-2008 03:44 PM
stratusrt01
Quote:
Originally Posted by matt caudill View Post
gust bought 2 AQhdc315 need to know what size port i need i want to tune it to 40 hz

Port depends on the enclosure size, not the woofer.
05-24-2008 03:43 PM
stratusrt01 One thing I noticed is that you figured the port displacement by taking the entire length of the port. Don't forget, the 1st 3/4" is already accounted for by outside of the box, so you can subtract that from the length. Also, if the port turns, you have to take that into account, as it will not take up the entire length as you figured it out, you would end up tuned lower than expected.

I always do it the way TommyK suggested also.
05-24-2008 03:20 PM
matt caudill gust bought 2 AQhdc315 need to know what size port i need i want to tune it to 40 hz
05-15-2008 05:06 PM
Fallen
Quote:
Originally Posted by kensaudio99 View Post
xmas is important while tuning a box?? Anyone know??
I usually wait till Christmas to tune my boxes
Otherwise it will adversely affect its response.

haha

xmax :P

And xmax has little to do with port velocity. Motor strength has more to do with it.

Think about a pro audio sub...they have less than 10mm xmax...but they need large ports to keep the port velocity down.

Look at it this way: The driver moves the LEAST when the port is at tuning and is moving the MOST!



05-15-2008 12:04 PM
kensaudio99
Quote:
Originally Posted by ndstrctbl View Post
Fb = 0.159*SQRT[(Av*(1.84*10^8)]/(Vb*1728*[Lv+(.823*SQRT(Av))])

LV is the length of the port

AV is your port area

VB is your boxes internal volume(every displacement accounted for)

Fb will be your tuning frequency once you work the formula through.

Alright, i write that down and i will see if come up with anything that is right. Also, i want to know if the woofer xmas is important while tuning a box?? Anyone know??
05-15-2008 10:12 AM
ndstrctbl Fb = 0.159*SQRT[(Av*(1.84*10^8)]/(Vb*1728*[Lv+(.823*SQRT(Av))])

LV is the length of the port

AV is your port area

VB is your boxes internal volume(every displacement accounted for)

Fb will be your tuning frequency once you work the formula through.
05-15-2008 10:04 AM
ndstrctbl
Quote:
Originally Posted by kensaudio99 View Post
What about the woofer xman?? Does that affect the enclosure too? Also i didn't read the whole thing carefully but how to figure out the tuning frequency of ported box??
thats not in there but i can get you the forumula.
05-15-2008 09:46 AM
kensaudio99 What about the woofer xman?? Does that affect the enclosure too? Also i didn't read the whole thing carefully but how to figure out the tuning frequency of ported box??
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