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Old 22nd February 2013, 09:51 AM   #371
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So is there a consensus on what 're-phased' speakers sound like compared to their 'raw' counterparts?

I'm pretty sure I've re-phased my individual drivers successfully (in the near field they measure flat phase individually, anyway, and I've lined up their delays to get to get the flattest crossovers at the listening position). In common with some of the posters here, I haven't gone for a full flattening of the amplitude response.

I've been listening to my re-phased speakers for a couple of weeks, and my take on it is that they are 'sweeter' than any passive speakers I've heard personally, or compared to active speakers without phase correction. They're not 'smoother' or 'flatter', nor would the word 'neutral' spring to mind (although I'm pretty sure this is really what 'neutral' really sounds like). I think that in some ways they are less 'dynamic' or 'punchy' (in a good way) with the result they can be turned up louder and listened to for longer without fatigue. I wonder if some speakers' 'dynamic' or 'musical' characters stem from transients with rapidly changing phase, frequency and amplitude effectively 'sweeping through' fixed filters, rather like a parametric EQ on a mixing desk making drums more punchy, even though it's a linear system. The re-phasing corrects this to some extent and 'de-punches' the sound. The corollary of this is that with corrected speakers it feels as though I might prefer a little less dynamic compression on some recordings, that ordinary speakers add extra punch to as a by-product of their 'musicality'. Or to put it another way, where extra 'punch' in the recording would have hurt my ears before, I could now tolerate some without getting sore ears.

Hand waving, of course, but does it sound plausible?

Last edited by CopperTop; 22nd February 2013 at 10:09 AM.
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Old 4th March 2013, 12:06 AM   #372
tnargs is offline tnargs  Australia
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Does this have the measurement import function that pos mentioned in #354?
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Old 4th March 2013, 09:35 PM   #373
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Not yet
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Old 13th March 2013, 03:37 PM   #374
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some measurements of my 3 ways system.

corrected with rePhase.

first step,minimum phase EQ

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phase linearization (4 feets)

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listening point (9 feets)

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measurement at 4 feets.
measured phase=minimum phase (Hilbert transform)

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Old 13th March 2013, 04:02 PM   #375
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another correction of a Gamut Phi7,2.5 ways

at 4 feets

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ringing is due to brickwall filter at 18 KHz in HOLM

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at listening point,left channel+left channel with a 100 Hz linear phase LPF (HOLM)

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measured phase=minimum phase (Hilbert transform)

Click the image to open in full size.

Last edited by thierry38efd; 13th March 2013 at 04:09 PM.
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Old 16th March 2013, 06:34 PM   #376
pos is online now pos  Europe
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rePhase version 0.9.4 is out:
rePhase | Free Audio & Video software downloads at SourceForge.net

No measurement import yet, but it shall appear in the next version...

release note:
Code:
0.9.4 2013-03-16
    - crash at start problems (previsously requiring temp/ dir content to
      be deleted) should now be solved
    - up to 16 banks can now be used in paragraphic gain and phase EQ
    - removed bank EQ tabs (settings saved with banks EQ will be
      automatically reported to paragraphic EQ banks)
    - improved graph range options: frequency and phase range can now be
      set and saved in settings
    - new phase wrapping implementation, automatically adapted to current
      phase range
    - view mode (compact/normal/large) is now automatically saved and
      restored from one run to the next
    - double-click on a fader value entry reset the fader to 0
    - improved raised cosine EQ. Interactions between EQs should now behave
      exacly like the "Ideal Graphic Equalization" exposed here in this
      application note: http://www.nordicsales.dk/imgdb/docs/lakewh_981.pdf
    - better precision for frequency entries (fractional up to 5 chars
      total to fit the entry) and appropriate up/down key binding (0.1hz
      steps under 10hz)
    - real 2/3 and 1/3 octave frequencies in paragraphic EQ sections
      (mandatory to make the raised cosine graphical EQ "magic" work...)
    - improved biquad precision (constant Q and proportional Q EQs) by
      adapting the sampling rate of each biquad to its fc
    - increased Q range (0.1 to 100)
    - improved phase deg precision in paragraphic EQ
    - added ESS sabre frequencies
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Last edited by pos; 16th March 2013 at 06:55 PM.
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Old 6th April 2013, 04:11 PM   #377
pos is online now pos  Europe
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rePhase 0.9.5 is online:
http://sourceforge.net/projects/rephase/

The long-awaited measurement import functionality is now implemented

release note:
Code:
0.9.5 2013-04-06
    - measurement import implementation, following HOLMImpulse import rules
      and interpolation strategy
      (first draft with limited functionality)
    - Nyquist frequency is now explicitly represented in gain result curve
      as a brickwall low-pass
    - result curves are now cleared upon settings reset or loading
    - improved energy centering algorithm
    - stop forcing energy centering to middle when only linear-phase
      corrections are in use
    - middle click on a fader reset its value to 0
    - bugfix for result phase curve unwrapping
    - bugfix on curves when polarity is inverted and a phase range larger
      than +/-180 is chosen
    - bugfix for 1st order high-pass filters
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Old 7th April 2013, 06:36 AM   #378
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Cool! Hopefully I'll have time to try it tomorrow.......errr, later today......
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Old 7th April 2013, 08:37 AM   #379
pos is online now pos  Europe
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Looking forward for your comments

Please keep in mind that any smoothing, gating, polarity, impulse offset or gain offset settings have to be made in the measurement software before exporting the measurement, as nothing can be changed afterward when importing in rephase (yet).
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Last edited by pos; 7th April 2013 at 08:40 AM.
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Old 7th April 2013, 10:13 PM   #380
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It works. It took a REW generated measurement no problem. I can make quick work of making my IIR crossovers linear phase now. I never had much luck with the A*B method, so I was making a lot of measurements and checking my work that way. What a pain in the ***, now it's quick and easy .

A couple more features would be nice now . I'd like to be able to click on the graph and see what freq and level the cursor is at (similar to Holm) or have it show up somewhere when hovering on the graph. Also, it would be nice to have target transfer functions to overlay on the graph for designing crossovers and hitting an acoustic target. Or, the ability to overlay more measurements so we can import our own targets. Not sure how you could implement that and not have the corrections affect all measurements.

I've been considering Audiolense or Acourate for drc (which is what I use rePhase for, as well as crossover phase linearization) because I think time-domain room correction has potential and is pretty interesting along with the usual freq correction. With your work with rePhase I may not have to shell out the $$$$. I like the fact that rePhase doesn't have any auto correction. Makes me work and I learn more in the process of doing it myself.

Good work!
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