Under Impulse Response Calculation, make sure "Use acoustic timing reference" is selected. For multichannel sound system measurement, it it best to point the microphone at the ceiling and provide your 90 degree calibration file when REW asks for it. Below, for example, we have set the scale from –0.003 to 0.003 seconds, or –3 to 3 ms.). Once all settings have been made, you can carry out your first measurement using the Start button! I'm running the newest beta of REW to set up my Outlaw 976. See the REW documentation for measuring with a timing reference for more details, especially the following: Take ~5 measurements of the left tweeter. Click on the "Measure" button again. 4. The easiest way to do this may be to switch to an unused configuration i.e. Using a loopback for timing reference is NOT the same thing as calibrating the frequency response of the soundcard. N. If you are using REW to measure a two-channel system with a USB microphone, you must use 5.15 beta 6 or later so that the speaker used for the acoustic timing reference can also be measured. Set REW up to take a multichannel measurement. REW version 5.15 or later is required. Then, open measurements window, choose a speaker and stick with it for ALL measurements including the reference one. In the best case, the levels are fine and your headroom is in the 10-15dB range. Using REW - Beta version . Set Timing (towards the top right of the window that pops up) to "Use acoustic timing reference.". These are the subwoofer outputs. REW can also be used for time domain measurements. Save Share. Each speaker will be measured for its time delay relative to this timing reference. The green plot shows the impulse response of the left surround speaker. (You can download this file based on your microphone's serial number from the UMIK-1 page. The impulse response of the full range measurement may be sufficiently different to the reference impulse response that the calculated delay is not zero, although it will be small. Typically, you will use one of your existing speakers for this purpose. Discussion Starter • #1 • Feb 8, 2017. REW will only send the timing reference 'chirp' to that speaker, not the full signal. The measurement technique will still apply even if you are not using a miniDSP multi-channel processor but the measurement procedure is a bit less convenient. It looks like this: Now run the measurement sweep and label it "Front Right.". Adjust the time scale in seconds. This feature can be used to determine relative timing/phase between drivers. Keep an eye on the large headroom display during the measurement. You must use REW 5.15 beta 6 or later when measuring a two-channel system with a USB microphone. ), Click on the "Measure" button (top left of the main window). crossover is 80 Hz . The option to wait for the acoustic reference is selected. C. Conrad. This time, set Output to "R" but leave Ref Output at "L." You will use this setting for all remaining speakers. Come join the discussion about home audio/video, home theaters, troubleshooting, projects, DIY’s, product reviews and more! Using most recent asio4all on windows 10 laptop via hdmi. That window looks like this, for newer versions of REW. First of all, disable bass management in the nanoAVR-BM plugin. Then I played sub 3 with acoustic timing reference and calculated delay needed to match the sub1+sub2 value; after input, I got 8-9dB gain as expected over a single sub. Reply. This has two key uses: If you export measurements to use in another program, that program can use the timing information to understand time (or phase) delays between the measurements. The choice of timing reference is in the Analysis preferences. If you want to learn a bit more about how this feature works, read on to the "Digging Deeper" section below. It's advisable to first confirm the acoustic timing setup is properly working. You can see that its largest peak is at 0 ms. Click Start. Is any other way to do it, when I can't use loop-back timing reference? As well as letting REW know the timing reference speaker, you need to leave that speaker turned on!! :smile: I use it as it is required for the Multi Sub Optimization software. However, this effect only worked occasionally for me with REW, whereas the lengthening always brought an improvement. With hardware loopback, the minimum requirement is for the analog output signal of the sound device and its loopback reference to have the same clock, and for the input device (the mic) and loopback input to have the same clock. You can then measure the frequency response of any speaker (including the one being used for the timing reference) with time delay embedded in the measurement. Don't forget to save your configuration to a file regularly. Here's the general approach. Now we need to calculate the delay to apply to each speaker. Or, if you are connecting your computer directly to an AVR for speaker timing measurement, disable bass management in your AVR (often accomplished by setting all speakers to "large". You should see plots that look as in the following example. Change that Acoustic timing reference and that'll enable another control lower down marked Ref output. Q. For example, this is our subwoofer: Click on each of the other measurements and write down their value of System Delay. Save Share. In our example speaker, the midrange driver goes very high, so we used 1 kHz to 20 kHz. The red one it turned out was a weird sweep file I received from someone over email. You can also use nanoAVR HD with an A/V Receiver, or a 10x10 HD with analog connections. Timing: since we have not wired a reference signal, I use timing no timing reference. Take your baseline measurement . In our example: (*) We are setting the same delay on front left and front right, as the slight difference is a measurement error. Or, click HELP in REW menu, and search for Timing ref and read it! You will see the output meter jump and then settle to zero. Thanks! Here for example is the routing to measure the center speaker: On the REW main window, click on the Front Left speaker measurement, and then click on the Info button: Locate the parameter "System Delay" on the window that pops up, and write it down. If you need to set time delay in an output channel of a miniDSP processor in order to time-align different speakers, REW will show you the delay of the measured speaker relative to the timing reference. In REW preference menu, tab analysis, box Impulse Response calculation, choose acoustic timing ref. I actually learned that distances for measurements made using a loopback and ones made using the acoustic timing reference are reported a little differently in REW. Check to make sure you have assigned the correct timing reference to a speaker with high frequency capabilities e.g left main. N. You can then measure the frequency response of any speaker (including the one being used for the timing reference) with time delay embedded in the measurement. Alternatively, you can use the method of routing to different HDMI channels described in our app notes Using the UMIK-1 and REW with HDMI output - Windows and Using the UMIK-1 and REW with HDMI output - Mac. ... For example, if you have a USB mic, or if you use "Acoustic timing reference"). I measured the sub alone, but I used the acoustic timing reference in REW through my Right speaker and then muted it straight away, so the sweep was only through the sub. Check to make sure you have assigned the correct timing reference to a speaker with high frequency capabilities e.g left main. In our example, that is the subwoofer with 2.69 ms delay. Save Share. Identify the speaker with the highest positive delay value. I was turning both mains off when measuring sub as sub takes signal from both mains. I have a different approach for that (already used for the manual correction feature) which looks to work well. You can now set up your bass management, based on accurate delays between all speakers. The description on the measurements pagegives suggestions for measuring both left and right main speakers and subs or just a center speaker and subs. See the app note Multi-Sub Optimizer with UMIK-1 for an example. For a better experience, please enable JavaScript in your browser before proceeding. If you use the same reference for two subs you can calculate the … If an acoustic timing reference is used REW will generate a timing signal on the output that has been selected to act as the reference before it generates measurement sweeps on the channels being measured.

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