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TOPIC: Either DIRAC or Rephase FIR Tool? Or both?

Either DIRAC or Rephase FIR Tool? Or both? 2 weeks 2 days ago #43130

  • Meshplate
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I just got a miniDSP SHD and I have the following noobie question.

In thinking without knowing all the details a thought occurred to me that DIRAC achieves linear phase crossover. Is that correct.?

So does DIRAC make the effort of configuring a crossover with the rephase tool in order to achieve a FIR crossover redundant and unnecessary?

In short, does DIRAC achieve automatically what I could achieve manually using the Rephase FIR Tool?

In other words, would it be faster and easier to set up IIR high and low pass filters and let DIRAC do the work that the rephase tool achieves for FIR filters?

Or have I not understood what DIRAC does? I have understood that it is much more than just EQ.

I am creating an active two way system crossing from a woofer to a tweeter, rather than a sub-satellite system.

Thank you for your insights.
Last Edit: 2 weeks 2 days ago by Meshplate.
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Either DIRAC or Rephase FIR Tool? Or both? 2 weeks 2 days ago #43131

  • john.reekie
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You can't actually do FIR crossovers with the SHD, so you use IIR and rely on Dirac Live to unwind the phase. I'm not sure I've checked the actual phase but you can see it in the impulse response. The crossover is still limited to the slopes/shapes that you get with IIR, whereas if you were designing FIR filters with rephase you have more control over that..
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?
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Either DIRAC or Rephase FIR Tool? Or both? 2 weeks 2 days ago #43132

  • Meshplate
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Thank you for your answer.

So you seem to be suggesting my thought was partly correct: that DIRAC achieves linear phase crossover (automatically and with less effort)

So my process will be to measure and set up IIR crossovers and then let dirac do the rest?
Last Edit: 2 weeks 2 days ago by Meshplate.
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Either DIRAC or Rephase FIR Tool? Or both? 2 weeks 2 days ago #43139

  • john.reekie
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Yes :)

BTW and OT does your handle refer to tubes?
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?
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Either DIRAC or Rephase FIR Tool? Or both? 1 week 2 days ago #43199

  • denver8me4dinner
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I’ve had excellent results using both


2x4hds as a dac and fir crossover and
Ddrc22d upstream.


Although Dirac will un-twist the phase in the sum of the responses from all the drivers in a multi-way, as John noted. I’ve really been liking a linear phase crossovers with Dirac better as the entirety of all responses are linear phase to begin with.

Than Dirac can focus on the room and not the speaker and do what it does best.

IMHO, it works better this way, however Dirac by itself is still very good, so don’t think for a second its not good without a linear phase crossover. The sum is what you hear anyways, so the end result is mostly the same, I’ve found with a rephase crossover there is virtually no driver interaction issues in any of the crossover stop bands which could be a result if you listen off axis at all or with uneven path lengths or if the way your crossovers behave with how Dirac moves the phase (maybe too steep a slope or high angles) Your crossovers May sound good and the change Dirac makes to the sum may not be how the two drivers or more want to play together with the correction applied. With linear phase it’s a non issue.

Hope that helps, if you have the means , both is very good.

Andrew
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