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    two 15" alpine type r's some ported box questions

    Vehicle : 2004 toyota sequoia
    Location in the vehicle: behind third row
    Space available (Length x Width x Height): 40x20x18
    Subwoofer make and model: Apline type r dual 2 ohm
    Subwoofer Size: 15"
    Number of Subwoofers: 2
    Type of Port (Kerfed, Slot, Aero, etc.): slot or kerfed
    What type of music do you like?: rap ; music with good base
    Is your goal SPL or Everyday Music?: SPL
    Tuning Freq (Hz): 32 hz
    Volume : 6 cubes

    Questions 1: What is the difference besides look between a kerfed or sloted port

    Questions 2: Is having the port on the same side as the subs the best

    Questions 3: So when i use my port length calculator and figure im using a 15" high X 8" wide port. going for 32 hertz tuning frequency with 6 cubes. Its giving my a port length of 43.59" which is is too big. how do i account for this?







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    Re: two 15" alpine type r's some ported box questions

    any ideas would really help me here




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    Re: two 15" alpine type r's some ported box questions

    a 8" wide port seems far too wide ..play with the width to get the desired tuning and port area




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    Re: two 15" alpine type r's some ported box questions

    Sell em to me lls



    Hu:Alpine IVA-D900,w/ 4x tv screens
    Front Stage: (front) Alpine spr-17s,Kicker ks13 tweets(rear) spr-69lp
    Sub Stage: (2) Kicker cvx 15s
    Box:6cu@34hz
    Electrical:Kicker rca,welding wire, 2x optima d31
    Amps: (2) Kicker dx1000.1s,dx400.4

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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by NASTY08IMPALA View Post
    a 8" wide port seems far too wide ..play with the width to get the desired tuning and port area
    I was just using that as an example. But I really wanna know if that is where "L" and "U" ports come into play

    Quote Originally Posted by Audio4ever View Post
    Sell em to me lls
    lmao. I bought them both used for $100 at a local shop. Pretty good deal if you ask me




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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by 4bannger View Post
    I was just using that as an example. But I really wanna know if that is where "L" and "U" ports come into play


    lmao. I bought them both used for $100 at a local shop. Pretty good deal if you ask me
    Yea thats where secondary port lengths come into play




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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by NASTY08IMPALA View Post
    Yea thats where secondary port lengths come into play
    i will upload my idea in a few and maybe you or someone else can tell me if im right




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    Re: two 15" alpine type r's some ported box questions

    Ok..say u have a port thats 5"wide and needds to be 30" long but ur interior depth is only 30" u would go 25" toward the back the L sideways 5" so u maintain the 5" port width




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    Re: two 15" alpine type r's some ported box questions

    would a "L" port sound better then a straight port. Spl or sql wise?




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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by 4bannger View Post
    would a "L" port sound better then a straight port. Spl or sql wise?
    The shape of a port isnt used for more or less sq or spl its merely a way to achieve proper tuning and port area...some designs need more than one port length some do nit..u wont here a audible difference if u do the math correct




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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by NASTY08IMPALA View Post
    The shape of a port isnt used for more or less sq or spl its merely a way to achieve proper tuning and port area...some designs need more than one port length some do nit..u wont here a audible difference if u do the math correct
    So If I wanted to do a wider port for a better look( the look a perfer) lets say 8" wide x 32.51" long I would then need a "L" port. Would making the port that wide mess with sound quality as long as i was keeping it tuned right.

    also. whould it change me tune hertz if i made the port kerfed?




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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by 4bannger View Post
    So If I wanted to do a wider port for a better look( the look a perfer) lets say 8" wide x 32.51" long I would then need a "L" port. Would making the port that wide mess with sound quality as long as i was keeping it tuned right.

    also. whould it change me tune hertz if i made the port kerfed?
    Kerf wont change tuning that much...andyea thats way too wide u want around 12-16" of port per cube




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    Re: two 15" alpine type r's some ported box questions

    OP, my port for my dual XFL 12 box is only 4 5/8" wide, and I ended up with 15.8in^2 of port area. An 8" port is way big.





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    Re: two 15" alpine type r's some ported box questions

    Quote Originally Posted by Full Tilt View Post
    OP, my port for my dual XFL 12 box is only 4 5/8" wide, and I ended up with 15.8in^2 of port area. An 8" port is way big.
    Okay so I guess ill go with a smaller kerfed port




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    Re: two 15" alpine type r's some ported box questions

    In short, larger ports equal less possibility for port noise but too large a port lowers power handling and makes the sub(s) more prone to damage when played below Fb. With respect to box tuning, more port area causes you to need a longer port. i.e., a 3" port tuned to 30 Hz will be shorter than a 4" port tuned to 30 Hz, all other things being equal. Larger box volumes will allow for shorter port lengths to achieve the same tuning frequency.

    Bent ports won't change increase SPL but they can decrease it if not constructed properly. When you do a bent port, you need to maintain port dimensions as closely as possible throughout the turns, which can be sufficiently achieved using 45° wave guides in the corners.

    Lastly, if we assume about 3 cubes per sub for the subs you mentioned, you need ~100inČ of port, which isn't too far off from the 120inČ of port area you mentioned. And in the end, I'd rather see a little more port area than needed than a little less, as turbulence in a small port can ruin the sound quality of the box.



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