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Reload Thread: Is xmax directly related to port area?

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    Is xmax directly related to port area?

    I have come to the conclusion from all my building expirience that when I have a low xmax sub they seem to like alot less port area than the high xmax ones. So hence would my proposed theory of using xmax in mm * .75 for inches of port area per cubic foot be a good starting point for my future builds? Thanks jw what some guys who really know the effect and requirments of port area are.

    Ex: An FI SSD 15. 21mm xmax, 4ft @ 34hz = 63 in port area
    ehqs12 9mm xmax, 2.5ft @ 33hz = 17in port area

    I dont really know about this it doesnt seem to work out too well, but then what about a speaker really determines how much port area you should give it?







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    Re: Is xmax directly related to port area?

    short answer = yes



    Quote Originally Posted by chase007 View Post
    if u need a box...I'l taked 3 years of shop class so i know what im doing.

    after i explained to him there's more to a proper box than boards and glue and he should practice before trying to sell boxes to others

    Quote Originally Posted by chase007 View Post
    yes personaly if it was some one elce that just starting making boxes but i'v taken shop for 3 years now...Making a lil box is nothing i don't need to pratice on a box to get it right i learned alot of stuff from 1 box and i can fix that in my next box
    after i told him that customers would care about the looks of the box

    Quote Originally Posted by chase007 View Post
    if u want some thing that looks pretty why don't u find a black guy with a big d*ck.

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    Re: Is xmax directly related to port area?

    So is there a general rule of thumb that we can use or what?




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    Re: Is xmax directly related to port area?

    Quote Originally Posted by bonesninja View Post
    short answer = yes
    How so?




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    Re: Is xmax directly related to port area?

    atleast compare two subs of the same size........................




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    Re: Is xmax directly related to port area?

    my guess is that it has something to do with the larger amount or air displaced with the larger excursion.



    Quote Originally Posted by chase007 View Post
    if u need a box...I'l taked 3 years of shop class so i know what im doing.

    after i explained to him there's more to a proper box than boards and glue and he should practice before trying to sell boxes to others

    Quote Originally Posted by chase007 View Post
    yes personaly if it was some one elce that just starting making boxes but i'v taken shop for 3 years now...Making a lil box is nothing i don't need to pratice on a box to get it right i learned alot of stuff from 1 box and i can fix that in my next box
    after i told him that customers would care about the looks of the box

    Quote Originally Posted by chase007 View Post
    if u want some thing that looks pretty why don't u find a black guy with a big d*ck.

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    Re: Is xmax directly related to port area?

    Not to thread jack, but I think I might have this problem. I got an mt 15, and the port is less than 5" deep port area is 12". Is this kind of like what he is saying? Would this cause a problem?



    EVERYONE has common sense, but its the stupid ones who dont follow it.

    Quote Originally Posted by bahn4lyfe View Post
    the eternal is ****** dude. i saw one break a dudes windows
    Quote Originally Posted by rumple4skin View Post
    polarity has nothing to do with the wiring, your sub is a big *** magnet man, when you send the electro magnetic pulse thro it backwords it is a bad deal lol.
    refs: aesoj, orangecounty1, Flipx99, bones22, and Korn4Life

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    Re: Is xmax directly related to port area?

    12" of port for an MT? you might as well have a sealed box that leaks real bad



    Quote Originally Posted by chase007 View Post
    if u need a box...I'l taked 3 years of shop class so i know what im doing.

    after i explained to him there's more to a proper box than boards and glue and he should practice before trying to sell boxes to others

    Quote Originally Posted by chase007 View Post
    yes personaly if it was some one elce that just starting making boxes but i'v taken shop for 3 years now...Making a lil box is nothing i don't need to pratice on a box to get it right i learned alot of stuff from 1 box and i can fix that in my next box
    after i told him that customers would care about the looks of the box

    Quote Originally Posted by chase007 View Post
    if u want some thing that looks pretty why don't u find a black guy with a big d*ck.

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    Re: Is xmax directly related to port area?

    haha yeah i was looking at your avatar and hoping that was done in MS paint or photoshopped




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    Re: Is xmax directly related to port area?

    MyFartsStink....you could SERIOUSLY increase the output of your MT by constructing a new box. How much space does your box have?



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    Re: Is xmax directly related to port area?

    Quote Originally Posted by bonesninja View Post
    12" of port for an MT? you might as well have a sealed box that leaks real bad
    I did the math to tune it to 34 hz. Checked online calc, it said its tuned to 33. So i dont know. Is it easy to knock that other port out and put a new one in?



    EVERYONE has common sense, but its the stupid ones who dont follow it.

    Quote Originally Posted by bahn4lyfe View Post
    the eternal is ****** dude. i saw one break a dudes windows
    Quote Originally Posted by rumple4skin View Post
    polarity has nothing to do with the wiring, your sub is a big *** magnet man, when you send the electro magnetic pulse thro it backwords it is a bad deal lol.
    refs: aesoj, orangecounty1, Flipx99, bones22, and Korn4Life

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    MyFartsStink's Avatar
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    Re: Is xmax directly related to port area?

    Quote Originally Posted by Tehgregzor View Post
    MyFartsStink....you could SERIOUSLY increase the output of your MT by constructing a new box. How much space does your box have?
    4 cu ft. And I was instructed to do the porting this way, I was not sure about it, but I want to know how it sounds first.



    EVERYONE has common sense, but its the stupid ones who dont follow it.

    Quote Originally Posted by bahn4lyfe View Post
    the eternal is ****** dude. i saw one break a dudes windows
    Quote Originally Posted by rumple4skin View Post
    polarity has nothing to do with the wiring, your sub is a big *** magnet man, when you send the electro magnetic pulse thro it backwords it is a bad deal lol.
    refs: aesoj, orangecounty1, Flipx99, bones22, and Korn4Life

  13. #13
    MyFartsStink's Avatar
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    Re: Is xmax directly related to port area?

    Quote Originally Posted by amartin_72 View Post
    haha yeah i was looking at your avatar and hoping that was done in MS paint or photoshopped
    vinal wrapped



    EVERYONE has common sense, but its the stupid ones who dont follow it.

    Quote Originally Posted by bahn4lyfe View Post
    the eternal is ****** dude. i saw one break a dudes windows
    Quote Originally Posted by rumple4skin View Post
    polarity has nothing to do with the wiring, your sub is a big *** magnet man, when you send the electro magnetic pulse thro it backwords it is a bad deal lol.
    refs: aesoj, orangecounty1, Flipx99, bones22, and Korn4Life

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    amartin_72's Avatar
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    Re: Is xmax directly related to port area?

    wow this is an emergency man that looks like a decent box you built there except for the major problem with the port, sorry to say but you need a new one.




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    Re: Is xmax directly related to port area?

    try like 80-100 of port and see what sounds like...and no, its not that easy to just change the port on an already constructed box



    Quote Originally Posted by chase007 View Post
    if u need a box...I'l taked 3 years of shop class so i know what im doing.

    after i explained to him there's more to a proper box than boards and glue and he should practice before trying to sell boxes to others

    Quote Originally Posted by chase007 View Post
    yes personaly if it was some one elce that just starting making boxes but i'v taken shop for 3 years now...Making a lil box is nothing i don't need to pratice on a box to get it right i learned alot of stuff from 1 box and i can fix that in my next box
    after i told him that customers would care about the looks of the box

    Quote Originally Posted by chase007 View Post
    if u want some thing that looks pretty why don't u find a black guy with a big d*ck.

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