Phase errors in REW

FidelioX · Nov 3, 2024

Hi guys,
Are the dotted lines that I highlighted with red arrows phase errors? Or are they just graphic elements?

I would like to understand how to interpret the phase graph and realize the errors present on my speakers.

second question: which calibration tools (Dirac live, Anthem ARC, A1 Evo nexus, etc.) are able to correct part of the phase errors?

thanks

John Mulcahy · Nov 3, 2024

Phase is cyclic, -180 degrees and +180 degrees are the same point. The lines show where phase has wrapped around that boundary. They are just a graphic convenience, there is an option in the View preferences to choose whether to show them.

FidelioX · Nov 3, 2024

Ok, thanks a lot for the clarification.
So, can you suggest me how to find/look at the phase errors?

thanks a lot

JLM1948 · Nov 9, 2024

The graph shows that phase has a continuously descending value, which looks pretty good.
Now, phase error compared to what?

Chris A · Nov 9, 2024

FidelioX said:
...So, can you suggest me how to find/look at the phase errors?...

See Some Attributes of Linear-Phase Loudspeakers.

The above document is found at the Linkwitz Lab site. It's kind of a smorgasbord of references on the subject of minimizing phase growth in loudspeaker acoustic output. It isn't rigorous, but it is thought provoking.

The first derivative of phase vs. frequency curve is called group delay, i.e., the rate of change of phase vs. frequency. Here's a paper on the audibility of group delay.

Chris

Phase errors in REW

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