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    Sealed Vs. Isobaric Volume

    If you have a single sealed box at the recommended volume for a specific subwoofer, can you just install another sub on top of it and wire it backwards, or should you increase the box volume?



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    Re: Sealed Vs. Isobaric Volume

    you have to half the volume for isobaric.



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    Re: Sealed Vs. Isobaric Volume

    So... a sub with a recommended box volume of 0.5 ft^3 would only need 0.25 ft^3? That doesn't make sense to me... someone please explain.



    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: Sealed Vs. Isobaric Volume

    So, if I'm not mistaken, with a sealed enclosure the recommended size for one sub you could use four subs like this?
    Attached Thumbnails Attached Thumbnails Sealed Vs. Isobaric Volume-isosealed.gif  



    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: Sealed Vs. Isobaric Volume

    TTT before I go to bed...



    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: Sealed Vs. Isobaric Volume

    Quote Originally Posted by Jonahdude
    So, if I'm not mistaken, with a sealed enclosure the recommended size for one sub you could use four subs like this?
    You are not mistaken




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    Re: Sealed Vs. Isobaric Volume

    Also, if I'm not mistaken, giving them each the same power you gave that one sub would result in the same output as 2 subs in a box four times as big?



    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: Sealed Vs. Isobaric Volume

    Four subs in two iso-pairs in a box the size required for one of the subs getting four times the power of one would provide the same output as a pair of subs in a box twice as big. Iso loading a pair of subs doubles the Mms and halves the Vas. The doubling of the moving mass halves the efficiency. Treat each pair as a single sub with half the Vas and twice the Mms and twice the thermal power handling.



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    Re: Sealed Vs. Isobaric Volume

    Quote Originally Posted by helotaxi
    Four subs in two iso-pairs in a box the size required for one of the subs getting four times the power of one would provide the same output as a pair of subs in a box twice as big. Iso loading a pair of subs doubles the Mms and halves the Vas. The doubling of the moving mass halves the efficiency. Treat each pair as a single sub with half the Vas and twice the Mms and twice the thermal power handling.
    Thanks, that answered my question.



    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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