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  1. #1
    Nikuk's Avatar
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    Bump...

    Lately I've gotten more PM's then usual in regards to tuning.

    Here is the formula to be copied into MS Excel:

    Fs=0.159*(((Av*(1.84*10^8))/((Vb*1728)*(Lv + 0.823*(Av^0.5))))^0.5)

    Fs = Tuning Frequency
    Av = Port Area
    Vb = Enclosure Volume
    Lv = Port Length

    You need to make a few reference cells in the spreadsheet (whichever program). You'll need Gross volume, Net volume, Port area, and Port length seperate from this 'cell'.

    This formula has been posted many, many times. As a matter of fact, that's how I came across it long ago. It meshes with a 1.5% +/- to BBP6 (when YOU account for port end correction).

    Use it if you wish, if not, so be it. This has worked for me for quite sometime.



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    Re: Bump...

    thank you. those people need to use the search button...
    and heres where you can dload the port calc excel file!!!

    http://www.rockymountainfun.com/amp/portcalc.xls



    '99 Toyota 4Runner
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    Front: Orion P6.2 Comps_________(Installed)_____$150 New
    Rear: Alpine Type R 5.25 Comps_ (Not Installed)___$50 New
    Subs: (1) 10" Alpine Type X Sealed. (Installed)____$50 New
    Sub Amp: Hifonics BX1500D ________(DOA)______$80 Used
    Comp Amp: Orion 8004 100 RMS X 4 (Installed)____$230 New



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  3. #3
    Nikuk's Avatar
    Nikuk is offline Been Gone Too Long

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    Re: Bump...

    Quote Originally Posted by themainjam
    thank you. those people need to use the search button...
    and heres where you can dload the port calc excel file!!!

    http://www.rockymountainfun.com/amp/portcalc.xls
    lol... good point.



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  4. #4
    req's Avatar
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    Re: Bump...

    ok, thats all and good, but you need to label what FB\VB\LV are for people who dont know. hell, i havnt memorized it yet. but good job with that excell file.

    remember kids, this will ONLY solve your port volume\length\size. it will NOT add the thickness of the MDF as a displacement, and it will NOT create a box-size relative to this port for you.

    for instance, if you decide your sub wants 1.0ft^3, and you create a port (using whatever) and the NET PORT DISPLACEMENT (port walls+port+end correction) - for ease sake lets say the net port volume is .3ft^3, your box is now .7ft^3. and you need to correct this by making a box that is 1.3ft^3 and adding the port.

    hopefully that made sense.

    Quote Originally Posted by jlaudio & njccbflo
    Av is the cross-sectional area of the port (in square inches),
    Lv is the length of the port (in inches)
    Vb is the enlcosure's net volume (in cubic inches)
    Fs is the tuning frequency of the box\port (in hertz).
    //edit

    lol, i just realized it is on there

    just in a different way than i realized. cool




  5. #5
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    Re: Bump...

    Quote Originally Posted by req
    //edit

    lol, i just realized it is on there

    just in a different way than i realized. cool
    Good Job....

    As for all the other stuff...

    Quote Originally Posted by NjccBflo
    ....regards to tuning.

    Here is the formula.....
    Tuning, nothing else.



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    Re: Bump...

    i dloaded it from someone else i just decided to host it for you guys!



    '99 Toyota 4Runner
    _____________________________Condition_____Price Paid
    H/U: Pioneer Premier DEH-630 ____(Installed)_____$100 Used
    Front: Orion P6.2 Comps_________(Installed)_____$150 New
    Rear: Alpine Type R 5.25 Comps_ (Not Installed)___$50 New
    Subs: (1) 10" Alpine Type X Sealed. (Installed)____$50 New
    Sub Amp: Hifonics BX1500D ________(DOA)______$80 Used
    Comp Amp: Orion 8004 100 RMS X 4 (Installed)____$230 New



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  7. #7
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    Re: Bump...

    i've never gotten a straight answer for this, but is the Vb with or without port and sub displacement? is its with, how do we calculate the port displacement?




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