It assumes that you already have a working knowledge of measurements with REW. If not, first see the app note UMIK-1 setup with REW. Since version 5.15, REW can be set to use an acoustic timing reference. Typically, you will use one of your existing speakers for this purpose. 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. 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. See the app note Multi-Sub Optimizer with UMIK-1 for an example. 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. This app note will show you how to measure and set these delays accurately.Ī typical setup is shown in this diagram: This is a common requirement in home theater. In this example, we are using a nanoAVR HDA. You can also use nanoAVR HD with an A/V Receiver, or a 10x10 HD with analog connections. 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.Īs shown in the diagram above, the left front speaker is used as the acoustic timing reference – this is indicated by the red "wave" coming from it. 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".) The easiest way to do this may be to switch to an unused configuration i.e.Įach speaker (including the left front) will be measured for its time delay relative to this timing reference.įirst of all, disable bass management in the nanoAVR-BM plugin. If you haven't already, set up the UMIK-1 calibration. (You can download this file based on your microphone's serial number from the UMIK-1 page.) 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. Measure front left and right speakers Ĭlick on the "Measure" button (top left of the main window). Set Timing (towards the top right of the window that pops up) to "Use acoustic timing reference." Check the frequency sweep range and level. Now run a levels check and then the measurement sweep. You will hear a short "peep" from the left speaker, shortly followed by a full frequency range sweep. Rename the measurement to "Front Left".Ĭlick on the "Measure" button again. Now run the measurement sweep and label it "Front Right." This time, set Output to "R" but leave Ref Output at "L." You will use this setting for all remaining speakers. To measure the remaining speakers, the measurement signal needs to be routed to the other channels. The simplest way to do this is to use the Routing tab in the nanoAVR-BM plugin, which will be described below. 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.
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