Crossovers and the differences?!

Discussion in 'Speakers' started by Johan_, May 18, 2005.

  1. Johan_

    Johan_ Auditioning

    May 17, 2005
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    Hello ppl,

    I now know that there are Crossovers with 12dB/Oct, 24dB/Oct, 48dB/Oct and some in between these values. Now I ask why? Is this because of the difference in response of some drivers?
    And how can it be that the phase gets 180 degrees turned when using passive xovers and most of the cheaper active xovers?
    My curiousity goes out especially to subwoofer integration, although I would also like to know how this applies to speakers and their circuitry.

    Anyway thanks in advance for answering this difficult matter!
  2. John Garcia

    John Garcia Executive Producer

    Jun 24, 1999
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    Real Name:
    In terms of speaker design, that is a fairly complicated question. Various slopes come into play because you are controlling how fast you want a particular driver to roll off and blend with it's complimentary driver. Phase is a little more complicated, and depends on the combination of drivers, but yes the x-over can be used to adjust the phase of the individual drivers. This may need to be done depending on the type and order of x-over used (Butterworth, Linkwitz-Riley, etc...)

    Phase can always be varied with passive (in the design) or electronic x-overs, makes no difference price or type for the most part.

    In terms of blending a sub, you generally want to roll off the sub faster than the main speakers because bass is more easily localized, and it will allow the mains to blend a bit more cleanly with the sub. Phase for the sub allows you to compensate for the sub's location within the room, relative to the main speakers. If the sub is near the mains, phase will generally be 0.

    Your receiver will handle the x-over point and slopes.

    If you are REALLY curious, there are a lot of good books out there. You might try The Loudspeaker Design Cookbook for starters, and there is also the DIY forum on here. [​IMG]

    BTW, you're not allowed to list your gear in your sig on this forum.

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