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impulse

  1. REW Forum
    Hi, Have been using REW to create convolution filters for Roon, following a great guide (not enough posts to link yet!) on the Roon forums. Getting pretty good results - thanks for creating this software! I have a future request for the REW export impulse response section: Have checkboxes...
  2. REW Forum
    Hello, it's my first post here. In the IR Windows the top two choices are windowing functions: Tukey, Blackman, Flat-Top etc. What are their uses and for what types of measurements? Is there a default one good for all situations? TIA
  3. REW Forum
    In the controls of the impules graph there are 3 t=0 offset adjustments t=0 offset (samples) t=0 offset (ms) t=0 offset (distance) 1. The "t=0 offset (distance)" does not accept negative distances(with the up/down buttons) 2. The "t=0 offset (distance)" changes "-1 ft" into "-11 in" 3. The...
  4. REW Forum
    Many years ago I bought an "Imp" kit from Liberty Instruments. This was more if a speaker measurement tool than room mesasurement. One of its best features was being able to measure gated (quasi-anechoic) impulse responses using MLS or Maximum Length Sequences. Instead of using an audible click...
  5. REW Forum
    Dear all, I am importing impulse responses in WAV format quite often but it seem that REW supports 16bit only e.g. 48kHz 24bits - not supported (even I set the sound card settings to 48kHz) 48kHz 16bits - fine 44.1kHz 24bits - not supported 44.1kHz 16bits - fine, even if the current sampling...
  6. REW Forum
    Is there a way to change the X-axis of the impulse response from ms to ft or meters. I can do estimates in my head, but this would be helpful.
  7. REW Forum
    I did notice something strange today when doing some test measurements on my new subwoofer that I am trying to add to my system. The impulse response changed between measurements even if I did not change anything, just run the measurements after each other. So which of the measurements is...
  8. REW Forum
    Hey, When i make a measure, my impulse response time are very short. The impulse response ends after approximately 2msec. Its hard to find the first reflex when, if i want to make a gated measurement. :coocoo: Does anyone have any suggestions? Regards
  9. Home Audio Acoustics
    Hello everybody. I did some impulse response measurements in my music room. It's a room mainly dedicated to teaching activities, and I'd like to make it sound as good as I can. I made a QRD Schroeder diffuser, placed in the middle of the roof, and now I'd like to understand what I can do to...
  10. REW Forum
    Hi, Quick summary: I am getting a delay in my impulse response when I export it to use in an IR loader. I currently do not have an ecm8000 but do have a c414 that I am using in omni. I calibrated the sound card and used the calibration numbers for the c414 TLII found in these forums for the...
  11. REW Forum
    Forgive me if this is a stupid question, but I have been hunting for an answer on here and in the manual for a while now to no avail. I am trying to figure out how to take an Impulse Response measurement. Every time I attempt to run a measurement the sweep is extremely slow and not a short...
  12. REW Forum
    Hi all, In my never-ending quest to interpret the impulse response of my dual subs (separately), I have run across another "bump" in the road. Below I have posted the response graphs for both subs, which I interpret to tell me that both have the same phase: both have the 100% peak in the...
  13. REW Forum
    Did a ton of testing last night... all left channel... searching for reflections and concluded a bunch of things that I want to share but first I must ask... What is the ideal -db drop from the initial peak to adequately control reflections and also does this -db change with time as in the...
  14. REW Forum
    Hi all - I've just started having another crack at REW but I'm now constantly getting the error msg "The impulse peak is not where it should be...." whenever I run sweep tones for my sub and mains. It was back in August I last had a play with REW and never had this problem. Nothing has changed...
  15. REW Forum
    Hi! I'm new here and new in REW. I've got a problem with impulse graph. I've got some .wav files to analyse. I choose file -> import impulse response The impulse graph looks like the end of impulse is loaded before 0 -.- Originally impulse was 6sec long. I've been trying to uninstall REW...
  16. REW Forum
    I treated my back wall with panels.... the results are in red. The orange was previous test with only a single 2x4 piece of minwool at the first reflection point at the back wall. Can someone help me decipher this. It looks alot better but want someone elses opinion. Microphone placed 4"...
  17. REW Forum
    Hi John, it would be possible to export the impulse as wav including compensation of calibration mic. Thanks in advance!
  18. REW Forum
    Hi, Im trying to measure the reverberation time over 125Hz - 4kHz 1/3 octave bands in a small music venue, using the impulse response available in REW. Due to room modes and spatial changes in the sound field, I'm taking 10 individual measurements around the room to get an 'overall'...
  19. DIY Subwoofers - General Discussion
    Hi, I am investigating how to get best possible impulse response from a sub that will go all the way or close to 20Hz. Ideally I want to play 20Hz square-wave and it will still look as a square-wave when I measure it with a good microphone. My first approach was that a horn loudspeaker would be...
  20. REW Forum
    I've only just discovered the benefits of applying filtering to IR measurements. Setting the filter point as close as possible to the preferred crossover point you can very quickly nudge the waveforms into alignment. In the phase plots this filtered IR alignment at the crossover point will...
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