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  1. JohnPM

    Designing an active 2-way speaker crossover

    No. The location of the timing signal (or signals if clock rate correction is enabled) is determined by cross correlation of the signal data with the captured data.
  2. JohnPM

    REW and RME: How to Generate EQ tailored for RME ADI-2 using REW?

    Yes, but REW doesn't allow filter centre frequencies below 10 Hz in equalisers. There is a high pass option on the Soundcard preferences, that applies a 2 Hz first order filter.
  3. JohnPM

    REW measurement of 2.1 system - would you EQ and where/how?

    The response looks typical of one where a measurement is being used as cal data. You have selected "Use loopback as cal and timing reference" but from your system description it doesn't look like there would be a way to have a loopback cable connected, which from your selections would need to go...
  4. JohnPM

    REW + USB cable = to high level of distortion in right channel - strrrange

    Some DACs mute both outputs if the left channel is silent. Try selecting "Fill silence with dither" in the Options on the Measure dialog.
  5. JohnPM

    REW+APO can't see the results but its working

    Choose the device name that doesn't start with EXCL.
  6. JohnPM

    The moving microphone method (MMM) for Dummies using REW

    Read further than the first few lines, the help shows settings to use including:
  7. JohnPM

    The moving microphone method (MMM) for Dummies using REW

    Rectangular can be used when input and output share the same clock. If they don't (if they are different devices) a window is required as there will be small differences in clock rates. Hann at 75% overlap with at least 4 averages or other windows at 87.5% overlap with at least 8 averages, for...
  8. JohnPM

    Room modes

    Individual room resonances are often not sufficiently isolated to make it easy to see the effect of an individual EQ filter, but here is an example where that is the case. The after plot is the result of a single EQ filter, Fc 50.00 Hz, Gain -15.00 dB, Q 11.881 targeting a modal resonance with a...
  9. JohnPM

    Focusrite 18i20 (gen.2), Lavry DA10, REW interpretation

    On macOS REW uses the sample format specified in the Mac's Audio Midi Setup utility for the interfaces being used. There is no 16-bit limitation. REW cannot control the interface sample rate on the Mac so the rate in Audio Midi Setup should match the rate in REW otherwise the OS will resample...
  10. JohnPM

    Stax SR-009S Electrostatic Headphone Review

    They used to cheat a bit with the equalisers, dropping the overall gain 1 dB with the EQ in circuit. It made everything seem to move further out in the soundfield when switching from bypass to EQ active. Despite the trickery the equaliser made the lambda signature sound even more natural, almost...
  11. JohnPM

    REW SPL plot can be a bit of a liar (is only correct for 1 cycle tone)

    Perhaps, but that is an unusual interpretation. It is the SPL that would result for a continuous tone. That becomes clearer if you consider what it means to convolve a signal with an impulse response. That process is usually implemented by multiplying the spectra of the signal and impulse...
  12. JohnPM

    REW SPL plot can be a bit of a liar (is only correct for 1 cycle tone)

    When you apply a single cycle at 120 Hz this is the input spectrum: Here's what a 500ms burst of 120 Hz looks like: The responses of a system to various tone bursts is not the system's transfer function. REW's SPL plot is an accurate view of the magnitude response of the system's transfer...
  13. JohnPM

    REW measurement makes an SPL graph and an IR. If I apply the IR to a 1 cycle tone or a long tone, the SPL is different. What gives?

    No. A sweep measurement measures the system's transfer function. That can be presented as an impulse response or magnitude and phase, they are equivalent. The REW primer has an explanation. To better understand the different results of convolving your various tone bursts it may help to look at...
  14. JohnPM

    REW EQ - match response to target

    With that very low target level you are using EQ filters as level controls, which they do not do well. To see what is happening at low frequencies either use no smoothing or Var smoothing.
  15. JohnPM

    Beta Test: Multitone Loopback Analyzer software

    From the REW help, emphasis added: When the Distortion Panel button (keyboard shortcut Alt+D) is selected the analyser calculates and displays harmonic or intermodulation distortion figures for the input, including THD, N+D (A-weighted noise plus distortion), N (noise and non-harmonic...
  16. JohnPM

    inconsistent results from two Umik-2

    It shouldn't have any effect on frequency response or impulse response since REW has corrected it, but it suggests the source clock is less accurate than usual.
  17. JohnPM

    inconsistent results from two Umik-2

    Very large clock adjustments in those measurements, a bit unusual.
  18. JohnPM

    UMIK-1 High Ambient SPL Measurements in REW?

    That's completely normal. Windows uses the whole percentage figures as the reference and shows equivalent dB figures for each step. Either of those is fine to use.
  19. JohnPM

    Can I get the early and late frequency response and cumulative energy time from REW?

    Just change the window reference time to move it. You can also drag the reference marker on the Impulse graph to reposition it.
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