Closed Thread
Results 1 to 10 of 10

Reload Thread: Is this tuning frequency correct..

  1. #1
    bholtmeier's Avatar
    bholtmeier is offline Holtskill



    Join Date
    Sep 2005
    Location
    nebraska
    Age
    26
    Posts
    1,491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Is this tuning frequency correct..

    I believe i found what i want to do with my new box, this should work great, i just needa know if this tuning frequency is about right.

    internal volume of 3.39
    port area of 39.75 sqin
    port dimensions of
    H:26.5" x W:1.5" x L:21"
    tuning freq:~32hz

    some reason i just re did it and i got 34hz about...someone check it for me.



    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344




  2. #2
    bholtmeier's Avatar
    bholtmeier is offline Holtskill

    Threadstarter


    Join Date
    Sep 2005
    Location
    nebraska
    Age
    26
    Posts
    1,491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: Is this tuning frequency correct..

    Oh and also, they say to use 1:8 ration of HxW, i'm using like a 1:17 ratio, will i expect problems from that?



    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344

  3. #3
    berserker's Avatar
    berserker is offline cogito ergo sum



    Join Date
    Oct 2006
    Location
    pennsylvania
    Posts
    34
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Is this tuning frequency correct..

    I get 34.72 so 35 hz if that is your true net volume of 3.39 I didnt take away for port displacement I am assuming you did to get that volume and your length to width ratio of your vent is a too high with 17.7:1 you shouldnt go above 9:1 max




  4. #4
    bholtmeier's Avatar
    bholtmeier is offline Holtskill

    Threadstarter


    Join Date
    Sep 2005
    Location
    nebraska
    Age
    26
    Posts
    1,491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: Is this tuning frequency correct..

    internal volume of 3.39
    port area of 39.75 sqin
    port dimensions of
    H:18" x W:2.25" x L:21"
    tuning freq:~32hz

    those are my new ones, but i'm going to have to find some way to limit how tall it is to achieve the 1:8 ratio, if you remember how my box looks you may know what i'm talking about on how the height is kind of standard at 26.5" .....(box is 28" tall)

    anyone have any suggestions?




    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344

  5. #5
    Join Date
    Oct 2005
    Location
    Beatrice, NE
    Age
    27
    Posts
    654
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Is this tuning frequency correct..

    Is it possible to put 2 dividers throughout the port to shrink the ratio? I'm going to be helping with this build and I've almost given up hope on this box. If the internal dimensions of the port are 26.5" now, you take away 1.5 inches of mdf, and divide by three...that equals 8 1/3". Now you would have 3 ports each 1.5"x 8 1/3". This would satisfy the 1:8 port ratio. You would end up with a little less port area of course, but would this even work?

    If you keep the net volume the same and do what's listed above, tuning comes out to be ~33.8hz according to my calculations.



    Ride: 1993 Mazda MX-3
    HU: Alpine CDA-9853 with KCA-420i iPod Interface
    Front Stage: Pioneer Premier TS-D602P
    Sub Stage: TC Sounds LMS-R 15 Dual 2 in 4 cuft. box tuned to 24hz
    Front Amp: Precision Power PC2400.2. 100rms x 2 at 4 ohms
    Sub Amp: Powerbass XA 1500d. 1500rms x 1 at 1 ohm
    Refs:
    Sold to: 99StangGt, Kagymp5, DMDAKOTA, Snozzer, spljunkiems, jblanford, 98dodgestratus, stishdr, kombat96
    Bought from: allenzo, BreakMyWallet, pickup1, defj, select127

  6. #6
    berserker's Avatar
    berserker is offline cogito ergo sum



    Join Date
    Oct 2006
    Location
    pennsylvania
    Posts
    34
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Is this tuning frequency correct..

    Quote Originally Posted by bholtmeier View Post
    internal volume of 3.39
    port area of 39.75 sqin
    port dimensions of
    H:18" x W:2.25" x L:21"
    tuning freq:~32hz
    Well with you new tweak and I believe you mean you have 40.5 in2 for port area and still assuming that is the true net at 3.39 cubes (although the Vb should’ve changed as you adjusted your plan and then in turn affecting your Fb), I get 35.01 so 35 Hz.

    Also I would personally give that SI Mag, if that is what you are using from your signature, a little more port area. Use 12 – 15 square inches per cubic foot for a good rule of thumb, you are close but still below the minimum, remember port noise *****.
    Last edited by berserker; 01-12-2007 at 02:15 AM.




  7. #7
    rpfuror's Avatar
    rpfuror is offline sound envy



    Join Date
    Oct 2005
    Location
    MD
    Posts
    695
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    3 Post(s)

    Re: Is this tuning frequency correct..

    I have never had problems going above the 8:1 ratio>> ANyone have any reading on this?

    I have design and tested many boxes recently with the ratio over this and not heard any type of issue at full excursion.



    **rpfuror_designs**
    ** Ask me about box design and construction **

    Build: bigmike8771, bama350z, nismos14, speedyg76, onnoff7, orioles26, Airman21

    Design: RFmustang, e22s, Platestacker45, lilgator, diminishedpower, hannibal05

    Buy/Sell: 00maxima, Flyhalf, CaliforniabOY5, angrytrucker78, shawnfleming, dre2390 , IM IN HERE, Spellman, LazyRider, mikescanlon, AZ-ss, BLD 25, x1le woofercooker, Twisted_0912

  8. #8
    bholtmeier's Avatar
    bholtmeier is offline Holtskill

    Threadstarter


    Join Date
    Sep 2005
    Location
    nebraska
    Age
    26
    Posts
    1,491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: Is this tuning frequency correct..

    Hmm....no port noise or anything with over a 8:1 ratio?

    Some how we have to split this port into 2 or 3, to make the ratio more even, but i'm not even sure if thats really possible...
    Last edited by bholtmeier; 01-12-2007 at 11:10 AM.



    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344

  9. #9
    rpfuror's Avatar
    rpfuror is offline sound envy



    Join Date
    Oct 2005
    Location
    MD
    Posts
    695
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    3 Post(s)

    Re: Is this tuning frequency correct..

    I'm kinda confused about the whole thing.. are you doing a slot port running along the width of the box and trying to maintain the 8:1 ratio??? That pic is a little confusing... tell me wha tyou trying to do and I'll see if I can help.



    **rpfuror_designs**
    ** Ask me about box design and construction **

    Build: bigmike8771, bama350z, nismos14, speedyg76, onnoff7, orioles26, Airman21

    Design: RFmustang, e22s, Platestacker45, lilgator, diminishedpower, hannibal05

    Buy/Sell: 00maxima, Flyhalf, CaliforniabOY5, angrytrucker78, shawnfleming, dre2390 , IM IN HERE, Spellman, LazyRider, mikescanlon, AZ-ss, BLD 25, x1le woofercooker, Twisted_0912

  10. #10
    bholtmeier's Avatar
    bholtmeier is offline Holtskill

    Threadstarter


    Join Date
    Sep 2005
    Location
    nebraska
    Age
    26
    Posts
    1,491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: Is this tuning frequency correct..

    Its confusing me too..initially i was going to try to do the port along the whole width of the box, but it would be impossible to stay at 9:1 or less doing that, so some how i have to create multiple openings for the port by puting dividers in there, or something. I dont know how it would work if it could though



    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344

Closed Thread

User Tag List

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum