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Question about a box

Discussion in 'Subwoofers' started by 03civ, Feb 23, 2005.

  1. 03civ

    03civ
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    If I supply someone with all the information about 2 woofers, could someone use a box building program and figure out the specs for a sealed box for me? I tried it myself and im having problems.
     
  2. 03civ

    03civ
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    Diaphragm Material : Kevlar Reinforced Pulp
    Magnetic Weight : 89.4oz.
    Mounting Depth (top mount) : 178mm (7”)
    Mounting Diameter (top mount) : 275mm (10-7/8”)
    Spider Material : Nomex
    Subwoofer Box Dimension (W x H x D) inches : 22-1/2” x 17-9/64” x 16”
    Voice Coil Diameter : 50mm
    Power Handling

    Power Handling Capacity (Peak) : 1000W
    Power Handling Capacity (RMS) : 300W
    Thiel Small Parameters

    Coil Height (Hvc) : 37.74mm
    Cone Area (Sd) : 467.59 sq. cm
    D.C.Coil Resistance (Re) : 3.6 ohm + 3.6 ohm
    Electrical Q (Qes) : 0.45
    Equivalent Suspension Stiffness (Vas) : 58 liters(2.04cu.ft.)
    Free Air Resonance (Fs) : 28Hz
    Frequency Response : 24Hz - 1kHz
    Gap Height (Hag) : 10mm
    Impedance (Nominal) : 4 ohm + 4 ohm
    Inductance (Le) : 3.85mH at 1kHz (1.34mH at 20kHz)
    Linear Excursion (X linear) : 13.87mm
    Maximum Excursion (X peak) : 27.7mm
    Mechanical Excursion (Peak-to-Peak) : 55mm
    Mechanical Q (Qms) : 8.31
    Sensitivity : 87 dB/W/M
    Total Loudspeaker Q (Qts) : 0.43
     
  3. 03civ

    03civ
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    I have 2 of these woofers and wanted them seperated in a box
     
  4. micb3rd

    micb3rd
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    I'll have a look, what make and model are they by the way?

    EDIT: I bet it is a Alpine woofer! most likely a Type-R.


    You have already been give one set of dimentions.

    "Subwoofer Box Dimension (W x H x D) inches : 22-1/2” x 17-9/64” x 16”"

    That gives you around 2.5 cubic feet after wood displacement.

    How much space do can you afford?

    I can rearange/resupply values if you want a more tall or long subwoofer enclosure, what shape do you want?
     
  5. 03civ

    03civ
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    yeah iits 2 4-ohm DVC type r 12's. It cant be no wider than 35" no more depth than 18" and no taller than 17.5"
     
  6. 03civ

    03civ
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    the box dimensions there was for the box the subs came in on the site where i found the subs info. It was for 2 subs i think so it was probly the dimensions cut in hald for each woofer, cuz 1.25 cubic feet sounds about right
     
  7. micb3rd

    micb3rd
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    Right I have run the woofers through a few box calcs.

    1.25 each is the minimum, this is the size suited to a car which has a large amount of cain gain envloved, as the gain is less in the home I would go for about 2 cubes each before driver displacement this will sound smoother give and lower bass extention.

    The outside wood dimention for 3.962 Cubic feet is 30W x 17H x 17D.
     
  8. 03civ

    03civ
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    okay cool, now is that sealed or ported?
     
  9. 03civ

    03civ
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    sorry i forgot i said sealed. Can you tell me what cain gain is? I have a coupe
     
  10. micb3rd

    micb3rd
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    We need to clear some things up, are these going in your car or in your home?

    If they are going in you car then 1.25 cubic feet each is fine, if there going in you home then you want 2 cubic feet each.

    cain was my spelling mistake, I mant to type cabin gain.

    Cars have large gains in the bass area due to only needing to pressurise a small area and reflected wave interactions boosting output.
     

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