box experiment please help me.

Discussion in 'Archived Threads 2001-2004' started by Michael_UK, Jul 10, 2001.

  1. Michael_UK

    Michael_UK Stunt Coordinator

    Jun 28, 2001
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    Hi everybody, I am newish to home audio, but I am very good at car audio and I had the Idea of having a go at making a subwoofer box for an old car sub to use in my room for a bit of bass, can any one help me with the box design because I have tried WinISDWinSPK and have not had much luck getting a box that plays down to 20 ish. (I think the sub woofer driver is not very good low down)
    here are the Paramiters for the sub.
    Technical datasheet
    Impedance (Z) 4 Ohm
    Frequency range 35–3,000 Hz
    Free air resonance (fs) 35 Hz
    Crossover frequency (12 dB/oct.) (fmax) 2,000 Hz
    Peak music power 450 W
    Power rating 150 WRMS
    SPL (1 W/1 m) 93 dB
    Cms suspension compliance 0.45 mm/N
    Mms moving mass 44 g
    Qms mech. Q factor 3.84
    Qes electrical Q factor 1.16
    Qts total Q factor 0.89
    VAS compl. equiv. vol. 180 l
    RDC DC resistance (Re) 3.7 Ohm
    Voice coil ind.(1kHz,Le) 0.4 mH
    Voice coil diameter 39 mm
    Voice coil former aluminium
    Air gap height 5 mm
    Force factor WxL 5.6 Tm
    Eff. cone area 531 cm²
    Magnet dioameter 125 mm
    Magnet weight 30 oz.
    Mounting cutout ø 282 mm
    Mounting depth 130 mm
    Dimensions ø 305 mm
    Weight 2.4 kg
    Am I wasting my time and materials with build a box for this sub (size of box does not matter e.g. 1-8 CF is possible by me.)
    I would like to have a box that plays down to abot 25 hz or lower if possable.
    Can anyone help me???
  2. Julian Data

    Julian Data Second Unit

    Oct 5, 1999
    Likes Received:
    The first problem is that the Fs of the driver is too high.
    Look for another driver, IMHO
  3. David Giesbrecht

    David Giesbrecht Second Unit

    May 28, 2001
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    I agree, Take a look at the Shiva or Tempest drivers
    from Adire Audio. [​IMG]
  4. Greg_R

    Greg_R Screenwriter

    Apr 9, 2000
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    Portland, OR
    Real Name:
    It sounds like he already has the driver and wants to maximize its performance for HT. Michael, I think you're going to have a hard time designing a box for this (10") driver that can play down to 25Hz with authority. I guess one approach would be to go with a high Q (1.0-1.2), low order (sealed or IB) design if you really want 25Hz.
  5. ThomasW

    ThomasW Cinematographer

    Nov 6, 1999
    Likes Received:
    Sorry but this driver isn't appropriate for what you want.
    As Julian said the Fs is too high, but also the Qts is way too high, the voice coil is too small, and there's no Xmax listed.
    It doesn't matter what size box you put it in, you'll blow it up trying to get any output in the 25Hz range
    [Edited last by ThomasW on July 11, 2001 at 09:22 PM]

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