Recent content by bixite

I made some progress. Thanks John for the hint. I build calibration files and then did measurements with loopback and calibration applied. Picture only shows phase of 4 different measurements. The 44.1kHz calibration worked out of the box and delivers flat amplitude and flat phase (dark green)...

Hi Keith, John was right in all his replies. All my questions are about phase not about the amplitude. The soundcard measures almost perfectly flat for amplitude. No problem here (see zoomed in version).

Correct, I see that in the comparison between the 44.1kHz and 96kHz measurements very obviously. My last picture above shows two phase plots from the same soundcard measurement. Orange as measured and Green with "Estimate IR Delay" applied. Which should be used as basis for "Make CAL file"?

Puh, it seems that I stumbled upon an interesting topic. Correct phase information is relevant to me, since I do not want to manipulate phase with FIR in the wrong direction (neither manually with rePhase or automatically with impulse inversion). I did another Soundcard calibration with REW for...

This is the soundcard calibration file. Obiviously, it has phase date which generate my phase shifts. I will try to redo the calibration and see what happens.

The problem is NOT the MIC calibration. It ist the soundcard calibration. Here a few lines: 8642 -0.006 -332.142 8643 -0.005 -332.132 8644 -0.004 -332.133 8645 -0.006 -332.131 8646 -0.005 -332.134 8647 -0.005 -332.118 8648 -0.007 -332.131 8649 -0.004 -332.132 8650 -0.006 -332.129 8651 -0.005...

Fabulous John, so many hours in REW and I still learn new stuff. Thanks a lot. It would be great to have this as an export option, which is the default. I assume that this would make sense in most cases when you want to work with the IR in other tools. Thanks a lot for your help. Kind Regards...

I created the mdat from the single measurement. I included two exported files also, which I reimported as measurement 2 and 3.

Here is my example: This is the measurement: Export Dialog (I tried many variations) After Re-Import same frequency response But different phase The two impulses are not identical but very similar. I do not find a way to export an IR and reimport it receiving the same data as the...

t = 0 is at the Impulse Peak before export and after import of the measurement. However, the phase differs. I can replicate the error in REW itself (without other tools) with t=0 at the same position of the measurement.

Hello, I am using REW almost daily in the development of active systems with FIR filters. I build my filters in rePhase. I export the frequency response as txt from REW and import it in rePhase. This works perfectly. I am testing with another tool for FIR-filter development right now, which...

Thanks a lot. Phase (Minimum Phase) is no factor in the computation. As long as I only want to generate one EQ set for the stereo output of the speaker, I am probably safest to use L+R measurements as the basis. If using several measurements around the listening position, I will average them in...

I am recently working a lot with REW (wonderful tool!) and use the EQ functionality a lot. I usually take multiple measurements and correct timing and SPL when necessary. I am not sure, what averaged measurements are the best to calculate proper EQ values in REW. db average is named as a...

How did you set MaxGain in the TraceArithmetic of A/B. Since you have a boost, you probably have allowed a few db there, correct? Did you measure, if the dip went away? When boosting you do not know in advance, if it will have an effect.

Great and thanks! I just tried this out and it seems that this approach can be iterated with more smoothing (e.g. 1/12 up to 200, 1/6 up to 8k, 1/3 above 8k). This works by using the "Merge B toA" result with the next smoothing. This is much more comfortable than editing the TXT-Files and the...