Linear Phase Passive Crossover
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 20th January 2011, 12:04 PM #1 jayam000   diyAudio Member   Join Date: Apr 2009 Linear Phase Passive Crossover I visted 2-Way Crossover Designer / Calculator website. There is one filter called Linear Phase. how it differes from Buterworth & linkwitz? i am interested in 4th order.
 20th January 2011, 12:25 PM #2 StigErik   diyAudio Member     Join Date: Feb 2008 Linear Phase is not possible in the analog domain. That calculator will anyway give very wrong results with real-life drivers, since it is assumed that both impedance and frequency response of the drivers is flat. __________________ dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
jayam000
diyAudio Member

Join Date: Apr 2009
Quote:
 Originally Posted by StigErik Linear Phase is not possible in the analog domain. That calculator will anyway give very wrong results with real-life drivers, since it is assumed that both impedance and frequency response of the drivers is flat.
you are right.
But i want to just know how it differs from normal butterworth & Linkwitz filter design.

 21st January 2011, 04:38 PM #4 Jmmlc   R.I.P.   Join Date: Oct 2005 Hello, You may read that message: Crossover Phase Behaviour Best regards from Paris, France Jean-Michel Le Cléac'h
phatChance
diyAudio Member

Join Date: Jun 2011
Location: Seattle
Quote:
 Originally Posted by StigErik Linear Phase is not possible in the analog domain. That calculator will anyway give very wrong results with real-life drivers, since it is assumed that both impedance and frequency response of the drivers is flat.
While there is some truth to that, analog can be approximately linear. For example, all solid state amplifiers used transistors which are non-linear components however most amplifiers are designed to operate within the linear region.

A linear phase filter is a filter thats delay is constant regardless of frequency. To achieve the same desired order as a non-linear filter, linear filters tend to be far more complex.

For things such as image processing linear phase filters have a big payoff but for audio you can usually get away with using non-linear filters unless you are striving for perfection, which I'm guessing you might be.

 10th August 2012, 10:53 AM #6 speaker dave   diyAudio Member     Join Date: Nov 2009 Location: The Mountain, Framingham I believe they are using a Bessel filter shape. A Bessel filter has linear phase or flat group delay in its passband via a softer corner shape. This, of course, does not mean that a combined system will be linear phase. David S Last edited by speaker dave; 10th August 2012 at 11:03 AM.
 10th August 2012, 11:26 AM #7 tvrgeek   diyAudio Member   Join Date: Dec 2009 Location: Md Yes, through the passband is what is important. Of course, you can toss that out the window as soon as you have two drivers. Errr, that's why we have a crossover, so that means we are in a jam. Then we have to deal with the driver itself. This is where the advanced measuring and modeling from a tool like SE comes in. With enough years of practice, you can get things to behave quite well. Look at the ZAPH designs for inspiration. No web fill-in-the-blanks crossover designer is going to get you any where near correct as they assume a resistive load and nothing on the mechanics and acoustics. Log off and measure.

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