TüN® 4: Working with Captured Traces

Image shows comparing captured subwoofer phase trace (grey) to captured woofer data (red)

Capturing traces is a great way to compare live data in TuN® Software's MEASURE tab to previous measurement data. Traces can be captured for the following measurement types: RTA, Magnitude, Phase, Linear Impulse Response, Logarithmic Impulse Response, Envelope Time Curve Impulse Response and Impedance. When a trace is captured in TüN® Software, all of the data is collected. This means captured traces can be scaled, zoomed, and displayed in different ways. For example, changes to Banding can increase or decrease the amount of data points visible within the RTA graph window. Captured traces are truly much more than just a “screenshot”.

To capture a trace for any of the measurement types listed above, simply click the Capture button near the bottom-right of the graph window, or simply press the space bar on your keyboard. This will open a prompt where a user can name the trace. It is good practice to appropriately name traces so they can be easily referenced at a later time. For example, if a user wanted to capture a left midrange speaker response before any frequency response correction, a good trace name might be:
“Left Midrange Before EQ”. By default, traces will be saved to and can be loaded from the Documents/JL Audio/TuN/Traces folder. It is recommended to make a new folder for each session.

Dual FFT measurements are saved as “.jtrf’ files and Single FFT traces are saved as “.jsrf” files. The Dual FFT captures can be loaded on any Dual FFT graph type (phase, magnitude, and impulse response).

Image shows Input Combo Box with captured traces displayed

After capturing a measurement trace, it will remain within the graph window. Traces can be displayed or hidden by selecting the input combo box in the upper right corner of the graph window. Below the list of selectable inputs is the section for captured traces and target traces. Captured traces will appear at the top of that list (below the inputs) above any target traces that may already have been loaded.

Right clicking on a captured trace presents additional options such as to resave the trace under a different name or color, remove that specific trace from the list and clear all traces from the list. Removing traces does not delete them from the computer and they can be loaded in again, when necessary. To change a trace’s color, right click on the trace and select “Resave As”.

To load a previously captured trace that is not visible in the Input Combo Box, click on the “Load” button and select the trace from the correct folder. If a trace is greyed out, this means that it cannot be loaded on the current graph type. For example, a trace that was captured on the RTA cannot be loaded on the Phase graph, but a trace that was captured in the Magnitude graph will, since they are both Dual FFT measurements.