Audio crossover

Discussion in 'Effects and the DSP' started by blitter2, May 24, 2011.

  1. blitter2

    blitter2 New Member

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    From what I have understood a crossover uses a low and a high pass filter.

    Second order crossover uses 12db filters and forth order 24db.

    So what will occur if I use a crossover and won't connect L1 and L2 is that I will loose all frequencies bellow center among ones above center attenuated by a low pass filter.

    Am I correct?
     
    Last edited: May 24, 2011
  2. Russ

    Russ Well-Known Member

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    2-Way crossover's are typically made from a lowpass and highpass filter, but not always...
    IIRC, kX crossover's use allpass filters.

    I am not sure what you are asking there, but, think of it like 2 separate filters/plugins.
    e.g.
    Code:
    |        | --> | lowpass  | -->
    | signal |
    |        | --> | highpass | -->
    
    If you do not use the lowpass outputs, then all you have is a highpass filter.
     
  3. blitter2

    blitter2 New Member

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    Yes but if I don't wire L1 and L2 at kx DSP all bellow center won't be heared at all.

    Because the signal bellow center along with its lowpass filter won't be redirected to any output.

    That is what I want. Not to hear it at all.

    Please correct me if I am wrong Russ.
     
    Last edited: May 24, 2011
  4. Russ

    Russ Well-Known Member

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    Sort of, but not exactly, remember it is a slope not a brick wall.

    i.e.
    Can you hear a signal attenuated by 6 dB? 12 dB? 18 db? 24 dB? ,etc.

    I think that would depend on what you have the volume set at, as well as what the original level of those frequencies was (or if something else is boosting those frequencies (e.g. some other EQ)), etc, right?
     
    Last edited: May 24, 2011
  5. blitter2

    blitter2 New Member

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    What I really mean is not to connect L1 and L2 to any of the outputs of my Live 5.1 .

    Front, Rear or Center output.

    Via kx dsp.

    Where then the signal is going to output from?
     
  6. Russ

    Russ Well-Known Member

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    Right, but you are still using the H1/H2 outputs, that look something like this:
    H1/H2 outputs of 2nd order crossover @500Hz

    Note that the signal does not just stop below 500Hz, it is attenuated more and more (on a slope) as you get farther away.
     
    Last edited: May 24, 2011
  7. blitter2

    blitter2 New Member

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    Btw I want center=35hz.

    Any dedicated frequency splitter for kx project?
     
    Last edited: May 24, 2011
  8. blitter2

    blitter2 New Member

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    If I use EQP5 with several HighPass filters and create a slope "cut" at 35hz using EQP5's monitor, will the signal left of the slope (black area) be heared?
     
    Last edited: May 25, 2011
  9. Russ

    Russ Well-Known Member

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    There is a frequency splitter plugin (under EQ & Filter), but it is not a brick wall either...

    Again, the signal is only attenuated (at a rate following the slope of the filter), it is not completely blocked. Whether you can hear it would depend on other factors. The steeper the slope, the less likely you are to hear it.
     
    Last edited: May 25, 2011
  10. blitter2

    blitter2 New Member

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    Thank you very much Russ
     

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