Why not linear phase?

[GOULAS]

Since a loudspeaker naturally exhibits a phase issue due to its high-pass and low-pass filters, isn't it mathematically correct to linearize its phase to 0° across its entire bandwidth?
With REW, wouldn't it be useful to have a program to achieve 0° phase, to satisfy those who think like me?

 

[Keith_W]

It's called "rePhase". John has previously said elsewhere that he does not see the point in duplicating the work.

And if you feel like paying money, there's also LinFIR (the new kid on the block, it's free to download and use!), and then there are a whole bunch of paid options - Acourate, Audiolense, Focus Fidelity, Eclipse Audio FIR Designer, etc.

 

[GOULAS]

Cela s'appelle « rePhase ». John a déjà déclaré ailleurs qu’il ne voyait pas l’intérêt de dupliquer l’œuvre.

Et si vous avez envie de payer, il y a aussi LinFIR (le nouveau venu, il est gratuit à télécharger et à utiliser !), et puis il y a tout un tas d'options payantes - Acourate, Audiolense, Focus Fidelity, Eclipse Audio FIR Designer, etc.

A ma connaissance, Rephase ne permet pas la phase linéaire en automatique.
Je vous remercie pour le lien avec LinFIR.

 

[dlr]

I've been using the Ultimate Equalizer (UE), part of the Bodzio software SoundEasy (SE) in my main dipole system for more than 10 years. 3-way system, linear (as in zero) phase, LR8 crossovers. It's commercial, yes, but worth the relatively cheap cost for the performance. This isn't guesswork, either, I measured the phase of mid/tweeter (can't measure w/m in-room for that). Also provides easy inclusion of the equivalent of a Linkwitz Transform to extend bass response (within driver limit, of course). SE is a full measurement/design suite.

As an aside, the UE allows for quick switching between minimum-phase and linear-phase. I never could hear the difference. I run it linear phase...because I can, not because I could hear a difference.

 

[GOULAS]

A quoi bon se casser la tête si finalement ça ne sert à rien, si on n'entend pas de différences!

Ca me fait penser à cette publicité :

 

[dlr]

A quoi bon se casser la tête si finalement ça ne sert à rien, si on n'entend pas de différences!

I left in that way because it's no effort either way. My point was to say that there is no audible difference between the two . I haven't tested that with my old 3-way that has PR system bass (I may at some point), but from all I've read there has not been any published research of which I'm aware that shows that anyone can hear the difference between minimum-phase and linear phase systems other than possibly the bottom octave. Leaving it in linear phase mode is simply because there is no effort needed either way. The UE does it all in software at the click of a button after setting it. No special time-consuming effort of rePhase or others like it. I started to try rePhase in the early days to experiment, but quickly decided it was a waste of my time.

Since a loudspeaker naturally exhibits a phase issue due to its high-pass and low-pass filters, isn't it mathematically correct to linearize its phase to 0° across its entire bandwidth?

The UE does precisely this automatically for each driver, then combines the responses for the system response. Each section phase must be linearized separately as it's not possible to do that after the sections are combined. It's all done at the click of a button on starting the system within the UE. It's Windows PC-based software.