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Thread: Need help with 4th Order box design/measurements

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    Junior Member jimadvig's Avatar
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    Need help with 4th Order box measurements

    Hello All,

    I am a noobie at building anything other then a typical slot ported sub enclosures. I am attempting to build a blow through box for my 2014 Ram 1500 quad cab. I am running 1 Skar ZVX-15v2 15" sub and want to do a 3:1 4th order blow through box. Skar said the sealed side should be 2.5cuft, ported area 4.5cuft and the port area should be 88 sq.in. He gave me sizes for a 2:1 box though. I have attached my measurements that I came up with from various calculators and the sizes include the sub, port and bracing. I have read that for a 4th order you should tune around 45hz. So that is what this is tuned for. I am also really unsure about the port size and length. Can anyone chime in and let me know what you think of what I have so far and if it will work worth a crap lol. Any help would be greatly appreciated. Thanks in advance.

    Name:  20170405_180311.jpg
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    Specifications


    • Skar Audio ZVX-15v2 D1 - 15" SPL Car Subwoofer
    • Dual 1 Ohm Voice Coil Configuration
    • Peak Power : 3000 Watts
    • RMS Power : 1500 Watts
    • Competition Grade Pressed Paper Cone
    • Stitched High Roll Foam Surround
    • Massive Triple Stacked Magnet
    • 3" High Temperature Copper Voice Coil
    • Frequency Response : 25 - 400 Hz
    • Sensitivity : 86.3 dB
    • Fs : 38.0 Hz
    • Re : 1.8 Ohms
    • Qms : 3.8
    • Qes : 0.40
    • Qts : 0.38
    • Nref : .27 %
    • Cms : 0.03 mm/N
    • Bl : 20.17 n/a
    • Vas : 58.5 L
    • Mms : 514 gr
    • Sd : 754 cm^2
    • Xmax : 29 mm


    Enclosure Specifications


    • Ported Volume : 4.00 ft^3
    • Port Area : 55 sq.in.
    • Port Length : 27"
    • Tuning Frequency : 33 Hz
    • Mounting Depth : 11.3"
    • Cut-Out Diameter : 14"
    • Magnet Diameter : 8.3"
    • Subwoofer Displacement : 0.17 ft^3
    Last edited by jimadvig; 04-06-2017 at 04:19 PM.

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