Recent content by MAD

  1. M

    Time Phase alignment

    You can use acoustic reference in REW to determine the delay between two systems. Set it to use the top as acoustic reference (one channel) and measure both with one sweep (two channel), the delay will be shown then in the info tab of the sub measurement. After setting the delay in your DSP...
  2. M

    Reference Speaker when using acoustic timing reference to measure delay

    It was not the DAC, with the UR22 I also have negative polarity, so I switched it in REW. I've done (still with the old DAC, but the measurement is only reasonable above 300Hz, so no issue with the bass boost I hope) some measurements with/without EQ and aligned (roughly) the phase in the XO...
  3. M

    Reference Speaker when using acoustic timing reference to measure delay

    Thanks for your offer, I will definitely come back on this soon :-) I've learned two days ago, that my external little DAC used for measurement (I assumed it' s better quality than the built-in soundcard) has an internal, non-switchable 3dB bass boost and is not really linear above 10kHz :-( So...
  4. M

    Reference Speaker when using acoustic timing reference to measure delay

    Thank you for your input / suggestions and the link! And yes, it seems that both Hi and Mid are reverse polarity. I recognized it when looking at excess phase being constant 180 degrees for both Hi and Mid. I will doublecheck - maybe it’s the controller. What do you mean with „the XO is about 2...
  5. M

    Reference Speaker when using acoustic timing reference to measure delay

    Regarding posts #17, #18 and my question on time aligment of Mid and Hi: I've did some further thinking and analysis - when accepting the proposed IR delay estimation (0.12ms / 4.1cm) for Mid, Hi and Mid IRs are in sync (regarding slope not peaks). So I've changed the delay for Mid from 0.25ms...
  6. M

    Reference Speaker when using acoustic timing reference to measure delay

    Measurements...
  7. M

    Reference Speaker when using acoustic timing reference to measure delay

    Based on your feedback and clarification I've done some more measurements: 1) Mid+Hi w/o delay 2) Mid+Hi with .25ms delay to the Mid Can you give me a hint where to see the (non-)alignment?
  8. M

    Reference Speaker when using acoustic timing reference to measure delay

    John, thanks for the clarification in the second clause, understood. But regarding acoustic transit time being a constant delay (which is so far clear to me) in this context is confusing me. Looking at your answer above and your statement in the other thread ("That should leave only constant...
  9. M

    Reference Speaker when using acoustic timing reference to measure delay

    These are the new measurements I'm referring to...
  10. M

    Reference Speaker when using acoustic timing reference to measure delay

    I've seen that, but I thought +1 octave below/above the frequency range I want use is enough for measuring Mid. So I've done the measurement again (Mid 20Hz-16kHz, Hi 250Hz-20kHz, both with Hi being the acoustical reference, fixed microphone position, Mid 0.25ms delay), and the estimated IR...
  11. M

    Reference Speaker when using acoustic timing reference to measure delay

    These are my two measurements, if needed to answer my question...
  12. M

    Reference Speaker when using acoustic timing reference to measure delay

    I've read the thread you are referring too before, but was still confused because I did two measurements (1m and 1.4m distance) of my Mid with the same acoustic reference (Hi) and found that the shown phase response was not the same, so I assumed I have to somehow subtract the distance. Redoing...
  13. M

    Reference Speaker when using acoustic timing reference to measure delay

    I'm not sure to fully get it, so let me try to rephrase what I understand :-) The transit delay to the HT (reference speaker) is automatically removed (including the measurement system delay because REW cannot distinguish between them), correct? And is this the reason why group delay is zero for...
  14. M

    Reference Speaker when using acoustic timing reference to measure delay

    Thanks John - and let me say first of all: Thank you for your great work! I also appreciate the immediate and helpful support in this forum! Back to my topic :-) I‘ve used the HT as acoustical reference, set a delay of .25ms for the MT based on the delay shown in the info window (in line with my...
  15. M

    Reference Speaker when using acoustic timing reference to measure delay

    Thanks, I will give it a try
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