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    saywhat?'s Avatar
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    close to correct?

    EXTERNAL
    15.5tall x 13deep x 35


    INTERNAL
    14*11.5*33.5=5393.5
    5393.5/1728=3.12
    3.12-.21=2.91


    port= 2.5*14=35 sq inch
    port length=20.3

    35 hz




    im thinkin of doin 40 or even 45 sq inches of port though, what yall think







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    Re: close to correct?

    Quote Originally Posted by saywhat?
    EXTERNAL
    15.5tall x 13deep x 35


    INTERNAL
    14*11.5*33.5=5393.5
    5393.5/1728=3.12
    3.12-.21=2.91


    port= 2.5*14=35 sq inch
    port length=20.3

    35 hz




    im thinkin of doin 40 or even 45 sq inches of port though, what yall think
    Port displacement is off. Remeber use 3.25 x 14 x 19.55" for the port displacement.

    3.25 = the wood used for the port
    19.55 = subtract .75 of the displacment for the end of the port being part of the original box measuments. Will not effect displacement.

    So that would make your box size 2.38ft^3. tuned to 33hz.



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    Re: close to correct?

    well would u be so kind to make a box a little WIDER, dont touch the height/depth to right around 2.5 or 3 (max width being 40, max depth being 15.) i gotta get this into a mustang haha. if u could do that, it would be great!




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    Re: close to correct?

    Quote Originally Posted by saywhat?
    well would u be so kind to make a box a little WIDER, dont touch the height/depth to right around 2.5 or 3 (max width being 40, max depth being 15.) i gotta get this into a mustang haha. if u could do that, it would be great!

    Actually I like the original outcome 2.38 tuned to 33hz is a decent box for say a 12.

    What speaker is it???

    If it requires less or more space I can do that 4 ya.



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    Re: close to correct?

    rl-p 15.....2.5-3.5 cubes


    tell me if this looks right-

    INTERNAL
    14*12.5*36.5=6387.5
    6387.5/1728=3.69.....say 3.7
    3.7*.21=3.48......say 3.5 .21=driver displacement

    port=14x2.5
    length=15.87 subtract .75 = 15.12
    15.12*14*2.5
    area=.25

    3.5-.25=3.25




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    Re: close to correct?

    Quote Originally Posted by saywhat?
    rl-p 15.....2.5-3.5 cubes


    tell me if this looks right-

    INTERNAL
    14*12.5*36.5=6387.5
    6387.5/1728=3.69.....say 3.7
    3.7*.21=3.48......say 3.5 .21=driver displacement

    port=14x2.5
    length=15.87 subtract .75 = 15.12
    15.12*14*2.5
    area=.25

    3.5-.25=3.25
    Nope, remember this being a slot port one of the walls you will be using a piece of wood to make it. so this would increase your port displacement. So your 2.5 becomes 3.25"

    Keep that box make the port 14 x 2.5 x 19. That will tune you to 35hz



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    Re: close to correct?

    problem is...i need to make a step up in the floor of the box so im gunna have to most likely have 2 turns in the port, what do u subtract from the length at each turn? im about to draw what u said into sketch up to see it visually, can u explain how u got 19 for the length?




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    Re: close to correct?

    more than one bend = same thing, just add the .75" to the port side wall measurment when factoring in displacment.

    Your box 15.5 x 14 x 38 = 3.70ft^3
    Speaker disp. = .21
    Total box size before port displacement - About 3.5ft^3

    With a port of 14 x 2.5 x 19 = .5ft^3

    So total box size would be 3.0ft^3.

    To tune the box to 35hz it would take a length of 20.78" factor in the side wall(remember slot port) it comes out to 19.53". I removed the .5" from the length to compinsate for the .75" of the box not factored in to displacement on the port.

    So to keep it simple I gave you 19" which would tune you to 35.25hz.

    If you want to be 100% accurate and get 35hz not 35.25hz then make the port 19.36"

    EDIT - Bold = port end correction. That is what it is called.



    Quote Originally Posted by Scoobydoo View Post
    Before poking fun at others at least learn to spell. I won't go into all the gammar mistakes!
    Irony?

    Quote Originally Posted by audioholic View Post
    Your sig... Im trying to figure out if you think he spelled grammar wrong. Because, he didn't. Irony indeed.

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    Re: close to correct?

    I'm being way to productive today



    Quote Originally Posted by Scoobydoo View Post
    Before poking fun at others at least learn to spell. I won't go into all the gammar mistakes!
    Irony?

    Quote Originally Posted by audioholic View Post
    Your sig... Im trying to figure out if you think he spelled grammar wrong. Because, he didn't. Irony indeed.

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    Re: close to correct?

    so if i do take a couple bends dont worry bout subtracting anything, just make it the 19 inches.




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    Re: close to correct?

    ...i was lookin shady on that jmac.....care to explain?




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    Re: close to correct?

    Quote Originally Posted by Jmac
    In the first one, it's 2.416 ft^3 tuned to 41.4 Hz ... He got port displacement wrong (assuming it's an L-shaped port) and used gross volume for calculating the tuning frequency instead of net volume ...

    In the second one, I get 2.993 ft^3 tuned to 36.86 Hz using a straight port (would have to fire sideways and it would be 20.75" - 2.5/2 - 0.75 = 18.75" not 19" anyways) and 3.013 ft^3 tuned to 36.74 Hz using an L-shaped port ...
    Maybe I did not calculate the port displacement for an L shaped slot port. Jmac do you care to explain where i went wrong on it???



    Quote Originally Posted by Scoobydoo View Post
    Before poking fun at others at least learn to spell. I won't go into all the gammar mistakes!
    Irony?

    Quote Originally Posted by audioholic View Post
    Your sig... Im trying to figure out if you think he spelled grammar wrong. Because, he didn't. Irony indeed.

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    Re: close to correct?

    I just went over it again. And this is what I got.


    Construction Material = 3/4" MDF
    Box Height = 15.5"
    Box Width = 38"
    Box Depth = 14"
    Number of Ports = 1 (Slot)
    Diameter of Ports = 14" x 2.5"
    Length of Ports = 19.9"
    Port Area = 35 square inches
    Box Volume = 2.97 ft^3
    Box Tuning = 34.87Hz

    All of this was done by hand. So could someone please verify the numbers. If you find a mistake please point it out with the correction. I'm pretty sure this to be accurate to my knowledge.

    This kept me up So I had to try and find what happened. Thanks Jmac.



    Quote Originally Posted by Scoobydoo View Post
    Before poking fun at others at least learn to spell. I won't go into all the gammar mistakes!
    Irony?

    Quote Originally Posted by audioholic View Post
    Your sig... Im trying to figure out if you think he spelled grammar wrong. Because, he didn't. Irony indeed.

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    Re: close to correct?

    jmac, ill be getting plans from u this weekend.




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