A Third Look at Graphs

Now that you've associated measurements with filter channels, you can look at another type of graph trace.

From the main menu, choose Graph, New Graph. This launches the Graph Properties dialog. The property page for Measurements, under Data, is the default when the dialog launches. On this page, check the checkbox for the measurement named Pos1_sub1.frd as shown below.

Next, choose Filtered Measurements as shown below.

Check the checkbox for the measurement named Pos1_sub1.frd as shown above. Press Apply. This shows two traces, the unfiltered and filtered Pos1_sub1.frd measurement of Sub 1 at the main listening position (position 1). The dialog shows that Sub Channel 1 performs the filtering. Choose Format, General, and on the resulting property page, check the Show legend checkbox. Choose Axes under Format, disable autoscale for the left y axis, and set its lower and upper limits to 60 and 120 respectively. Click OK. The filtered measurement shows the effect of the 24 dB/oct Linkwitz-Riley low-pass filter in Sub Channel 1 on the Pos1_sub1.frd measurement. The default cutoff frequency of newly-created low-pass filters is 80 Hz, so activating the data cursor and setting it as close as possible to 80 Hz should show a 6 dB difference between the filtered and unfiltered Pos1_sub1.frd measurement as shown below.