rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool

[pos]

It looks like you are trying to import EQ settings as measurements, which they are not.
You need to go to the "Paragraphic Gain EQ" tab, choose a bank, and use the "import REW filter settings" function in the "Tools" drop-down menu.
Keep in mind that every existing EQ points set in this bank will be lost when importing REW settings.

[grizzli]

Good day!
First of all I want to thank you for your hard work! Great program! Thanks. I'm trying to figure it out. I am not a physicist and it is not easy for me How to turn the phase to 180? I have a task at frequencies of 100-150 Hz through the FIR filter to expand the phase. How can I do that ? Thank!

[pos]

Hello grizzli,
Thanks for the kind words
Turning the phase 180° for the whole frequency range is simply done by reversing polarity, but I guess this is not what you want to do here.
Altering phase in a restricted frequency range can be done in rephase using the filter linearization tab, or the phase EQ tab.
I would advice you to preferably rely on the filter linearization tab, and only correct existing phase shifts, and not necessarily everything that a given measurement show you. It is very easy to be fooled by a measurement and over-correct things that should be left alone such as comb filtering from reflections, diffractions, etc.

[grizzli]

Originally Posted by pos

Hello grizzli,
Thanks for the kind words
Turning the phase 180° for the whole frequency range is simply done by reversing polarity, but I guess this is not what you want to do here.
Altering phase in a restricted frequency range can be done in rephase using the filter linearization tab, or the phase EQ tab.
I would advice you to preferably rely on the filter linearization tab, and only correct existing phase shifts, and not necessarily everything that a given measurement show you. It is very easy to be fooled by a measurement and over-correct things that should be left alone such as comb filtering from reflections, diffractions, etc.

I do not understand. Unable to deploy phase as you want. Something I am doing wrong.
I have to settle like this. Is it possible

[pos]

Is it a 100 to 150Hz measurement?
I am afraid I cannot provide any meaningful advice based on these screenshots.

[grizzli]

Originally Posted by pos

Is it a 100 to 150Hz measurement?
I am afraid I cannot provide any meaningful advice based on these screenshots.

Yes, I just need to turn these frequencies. Measurement made them. The full range of frequencies does not work, some kind of incomprehensible schedule comes out. I can throw the result of measurement.
I would be very grateful if you look.

[thierry38]

Hi Thomas


Time to waste ?
a constant slope from a given frequency ?
it can be done with low Q EQ but not really flat.
i'm getting out...

[pos]

Originally Posted by grizzli

Yes, I just need to turn these frequencies. Measurement made them. The full range of frequencies does not work, some kind of incomprehensible schedule comes out. I can throw the result of measurement.
I would be very grateful if you look.

If you want an accurate measurement of that range you need to start the sweep lower in frequency.
Moreover, you also need to see what is going on around that range to get a good assessment of the situation.

Regarding that particular measurement, the passband of its magnitude response appears to be around 80dB, so you need to set the gain offset to around -80dB in the measurement tab to see it.

Using minimum-phase EQ to "flatten" the magnitude response (quotes here to emphasis the fact that attempting to flatten anything in such a tiny range is not really meaningful) will already tend to flatten the phase response.

[pos]

Originally Posted by thierry38

Hi Thomas


Time to waste ?
a constant slope from a given frequency ?
it can be done with low Q EQ but not really flat.
i'm getting out...

Hi Thierry,

I am afraid such a constant slope would not be physically "sustainable"
You ought to have a knee somewhere otherwise the magnitude would be infinite at DC, no matter how gentle the slope.
If you are looking for a linear-phase response then using a LR filter with a low slope (can be set as low as 1dB/oct manually) would work. A "reject low" low-pass filter would also work, with a more angular knee.
For minimum-phase response a shelving filer (in the EQ tab) with a very low Q would work.

[thierry38]

Re-Hi Thomas,
Linear phase or min. phase do not allows this "soft" slope from a given frequency (rePhase 1.4.3)
No needs to start from DC,but something like about ~500/2KHz.



neither with LR choice (min 12dB/oct) nor low shelving..
This is not important i can do it with min.phase EQ.


Just a suggestion.


Edit:with a linear phase tab,it'ok (but it's starting at "DC")
no frequency choice for "cutting"