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    Brian Owens's Avatar
    Brian Owens is offline CarAudio.com Elite



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    Need help with a 4th order bandpass box

    First attempt at a Bandpass Box.

    I just built a 4th order BP box for a Panasonic 10" woofer, and it sounds terrible. Not "bandpass" bad, just designed wrong. The frequency response is WAY off.

    Here is what I have:

    Panasonic 10" t/s
    Vas: 42 L
    Fs: 30.0 Hz
    Qts: 0.37


    I input that into the calculator on carstereo.com and came up with:

    Volume front = .397 ft^3

    Volume rear = .533 ft^3

    Fb (front side) = 58.3 Hz

    Frequency response ~ 35-90 Hz


    Added sub displacement and port displacement to the front and rear volumes and built the box.

    Due to the small area, I could only get a 3" port into the enclosure. Maybe that is too small? Calculated a 3" x 12" long port.


    Anybody tell me what to do different?????

    Thanks!
    Brian



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    Re: Need help with a 4th order bandpass box

    Quote Originally Posted by Brian Owens View Post
    First attempt at a Bandpass Box.

    I just built a 4th order BP box for a Panasonic 10" woofer, and it sounds terrible. Not "bandpass" bad, just designed wrong. The frequency response is WAY off.

    Here is what I have:

    Panasonic 10" t/s
    Vas: 42 L
    Fs: 30.0 Hz
    Qts: 0.37


    I input that into the calculator on carstereo.com and came up with:

    Volume front = .397 ft^3

    Volume rear = .533 ft^3

    Fb (front side) = 58.3 Hz

    Frequency response ~ 35-90 Hz


    Added sub displacement and port displacement to the front and rear volumes and built the box.

    Due to the small area, I could only get a 3" port into the enclosure. Maybe that is too small? Calculated a 3" x 12" long port.


    Anybody tell me what to do different?????

    Thanks!
    Brian
    try posting in the right section for 1. there is an enclosure section



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    2loud4u's Avatar
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    Re: Need help with a 4th order bandpass box

    Hook up with 80 He will get you in the right direction.




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