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    SpdDmn713's Avatar
    SpdDmn713 is offline Junior Member

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    Dec 2006
    Atlanta, GA
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    Specific Port v. Sealed question

    I am getting an IDMax 12" and trying to decide on the type of enclosure to use. I am trying to build good system. By good I don't mean loud, I mean good sound reproduction. I don't need to be heard from a mile away, I just want good sounding loud music inside. I figure 1000w on a sub will be loud enough for me no matter what type of enclosure, so would like the best SQ the sub can do. I have tried to do a lot of reading of old threads and searching for info, and have, if my thinking is correct, come to the conclusion to go with a sealed 1.3cu ft box.

    Am I thinking correctly for a daily driver setup that will play a wide variety of music?

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    96civ's Avatar
    96civ is offline Senior VIP Member

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    Re: Specific Port v. Sealed question

    For the flattest response curve (assuming cabin gain doesn't provide massive dB gains) the box needs to be aligned at a Qtc value of 0.707.

    An easier way to explain this is that the net volume of the sealed box needs to be:

    Vb = Vas / [(0.499849)/(Qts^2) - 1]


    Vb = net volume of sealed enclosure
    Vas and Qts are T/S parameters for your driver. You can probably find these variables in your owner's manual or by contacting the manufacturer.

    Vehicle: 1996 Honda Civic EX
    Head-Unit: Alpine CDA-9856
    Subwoofer: 2 12" Fi SSD
    Box: Sealed: approx 1.1ft^3 per chamber
    Sub amp: Kicker ZX1000.1
    Components: JL XR650-CSi
    Comp amp: Profile AP1000
    Before you accuse me, take a look at yourself.
    Refs: phrozen5100, 1meanGTA, famous_78

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