Measurement 4: Measure correct delay and frequency response using channel 2 as reference

For some applications, correcting for your measurement system (usually only the sound card) is recommended. A simple way of doing this correction is to use channel 2 as reference. But for other applications, this is not required. If you know that you are going to use WinMLS only as a signal generator or for measuring reverberation time or background noise you may skip this part.

Note: If you are using the USB Pre sound card, or another sound card where the input sampling frequency is not exactly the same as the output sampling frequency, to obtain the best results you use channel 2 as reference as will be explained below.

This section assumes that you have completed the first measurement walk-through.

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Connect a loop-back to be used as reference

Using channel 2 as reference

Verify that the channels are equal