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Dirac and REW do not match?

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Dirac and REW do not match? 1 year 3 weeks ago #60675

  • Harlow
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I am finding that Dirac predicted frequency response curves are very different from measurements made with REW (with Dirac filters loaded to DDRC-24 and active).  Can you help me understand this?  This has been bugging me for a long time so I decided to do an experiment.

My system:  Quad S2 speakers, Yamaha RX-770 receiver, DDRC-24 (firmware and software up to date), UMIK-1

My experiment:  Use DDRC-24 PEQ to create an approximately flat frequency response with Dirac inactive.  Document flat frequency response with TrueRTA and REW.  Use Dirac to create Dirac filters with flat target curve and PEQ settings active.  Use TrueRTA and REW to document frequency response with Dirac filters and PEQ settings active.

Please see attached PDF document my experiment.  Can you explain?

Thanks!

 
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Dirac and REW do not match? 1 year 2 weeks ago #60735

  • denver8me4dinner
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It does match
you’re not averaging properly and 
Dirac uses different algorithms then FFT pink noise. 

also , auto correct also means under correct. It has to be careful not to over do it 


otoh… FR corrections it does a superb job…
it will ignore certain high Q dips that a spacial average would mask as spacial averages add information…

a FDW will remove information 

so it’s not apples to apples 

but rest assured , it’s accurate 

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Dirac and REW do not match?