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-db level of subwoofers - explanation please

Discussion in 'Subwoofers' started by tfraser, Feb 24, 2001.

  1. tfraser

    tfraser
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    I am in the process of choosing two 10" drivers for a diy sub. One is Scanspeak ScanSpeak 25W8565 01 £119
    https://secure.wilmslow-audio.co.uk/acatalog/Wilmslow_Audio_Scan_speak_Drive_Units_19.html
    and Stryke SB10 at $149 plus I don't know how much carriage; could be out of the question.

    Using WinISD freeware program I can see that the Stryke has -7.69db at 20hz and the Scanspeak has -12.16 at 20 hz.

    What does this mean folks. Is it a big difference, big enough to order the one from the states?
     
  2. Ramius

    Ramius
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    From the help section on WinISD-

    ...The purple line is the -3dB (or half-power, or cutoff) point. This line represents the frequency at which the usable bass output of the box "runs out of steam". Any frequencies below the intersection at the -3dB point simply won't be reproduced very well by the box...


    A couple of excellent DIY guides that explains subwoofer design (a good read)-
    http://www.diysubwoofers.org/
    http://www.audioc.com/diy/Information/submanual/sub_manual.htm


    What about going for a vented enclosure?
    It's is probably preferable for home cinema duties.

    Cheers
     

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