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Multi-Way Conventional loudspeakers with crossovers

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Old 7th November 2018, 10:03 AM   #651
kimmosto is offline kimmosto  Finland
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Join Date: Oct 2005
Location: Kuopio
Quote:
Originally Posted by iMat View Post
I did not say that calculation of minimum phase is waste of time, but user has to be aware of eventual benefits, and when to apply it.
I know and agree.

Another option to create compensation file is IIR equalizer, which would also manipulate phase response. I suppose that method would be politically more correct than minimum phase extraction, and wouldn't rise so much discussion how minimum-phase device mic is. Natural consequence of that discussion could be new question: should we compensate baffle step of speaker with IIR shelf or linear phase FIR shelf, if diffractive/reflective radiator is not perfect minimum-phase? I think there is consensus that IIR is better (though not perfect) despite of delayed diffractions.

Anyway, I have compared compensation files created with both methods. Difference in phase was very close to zero deg with my Clio MIC-01 if automatic slope detection for minimum phase extraction uses whole last octave (or slope is set manually to 0 dB/oct).
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Old 7th November 2018, 11:17 AM   #652
iMat is offline iMat  Croatia
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Join Date: Sep 2014
Location: Croatia
Quote:
Originally Posted by kimmosto View Post
I know and agree.

Another option to create compensation file is IIR equalizer, which would also manipulate phase response. I suppose that method would be politically more correct than minimum phase extraction, and wouldn't rise so much discussion how minimum-phase device mic is. Natural consequence of that discussion could be new question: should we compensate baffle step of speaker with IIR shelf or linear phase FIR shelf, if diffractive/reflective radiator is not perfect minimum-phase? I think there is consensus that IIR is better (though not perfect) despite of delayed diffractions.

I see that you are on road to get impulse response of total system, including crossover response. It would be new approach that gives more insight in time domain response.

In may work I have found that over-equalized high order systems have lot of troubles to retain natural sound. I always prefer low order IIR equalization which introduces small number of resonances (in peaks and dips).
Why?
Let me note that ripples in loudspeaker response comes from two sources: resonances and sound wave reflections. It is not good thing to equalize ripple (notches) that are reflections based with filters which use pole-zero-resonance compensation. In that cases filters just becomes sources of new resonances.

Ivo
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