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    Jonahdude's Avatar
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    4" Port... Big Enough For This Box?

    If I had a box for 6 8" subwoofers, with a net volume of 4.46 ft^3, would a 4" port be big enough? It would be 3.5" long, which would tune it between 34hz and 35hz.



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400




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    Moe Lester's Avatar
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    Re: 4" Port... Big Enough For This Box?

    I would do at least 1 4" port per pair of 8s personally...




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    Re: 4" Port... Big Enough For This Box?

    so 3 4" ports, how long would each have to be to tune to 35hz? Would it still be 3.5 inches, or does it change when you add more ports?



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400

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    Re: 4" Port... Big Enough For This Box?

    Bumped TTT!



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400

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    Re: 4" Port... Big Enough For This Box?

    TTT again...



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400

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    Re: 4" Port... Big Enough For This Box?

    Ttt, when adding more ports to you have to increase the length of each to maintain the same tuning?



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400

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    Re: 4" Port... Big Enough For This Box?

    I just learned this last night:

    For multiple ports, just divide the volume of the enclosure of the box by the number of ports, and calculate each port by itself

    So with your numbers above, you divide 4.46 ft^3 by the 3 ports = 1.48 ft^3 per port

    Now calculate the port as you normally would to tune a 1.48 ft^3 box to 34hz... then make all 3 ports that size. Get it? If not, I'm just wakin up, I can clarify later...




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    Re: 4" Port... Big Enough For This Box?

    Quote Originally Posted by Exaran
    I just learned this last night:

    For multiple ports, just divide the volume of the enclosure of the box by the number of ports, and calculate each port by itself

    So with your numbers above, you divide 4.46 ft^3 by the 3 ports = 1.48 ft^3 per port

    Now calculate the port as you normally would to tune a 1.48 ft^3 box to 34hz... then make all 3 ports that size. Get it? If not, I'm just wakin up, I can clarify later...
    Ahh, I get it, that makes sense. Can anyone verify that?



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400

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    Re: 4" Port... Big Enough For This Box?

    I got it off JL's tutorial site if you wanna check that out




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    Re: 4" Port... Big Enough For This Box?

    Alright, it's not that I didn't believe you it's just that you said you learned it last night.



    New setup in the works:
    Vehicle: 1999 Ford Windstar
    Head Unit: Pioneer Premier DEH-P860MP
    Signal Processing: Profile Q100 3-Way active crossover, set to 80hz and 3.5khz
    High Pass: the legendary Aura tweeters powered by a Pioneer GM-3000T
    Band Pass: Ascendant Audio 6.5" Poly Midwoofers powered by a Pioneer GM-5000T
    Low Pass: Elemental Designs 19Ov.2 in 3ft^3 tuned to 30hz, powered by a Power Acoustik 2APC-1400

  11. #11
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    Re: 4" Port... Big Enough For This Box?

    hope your not tuning low



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    1 hifonics bxD 1500
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    http://www.sounddomain.com/memberpage/681937/1 just set ti up so it is kinda lame

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