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  • Placing probes
  • Using the Spectrum Window
  • Probe Analysis

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  1. HOLOPLOT Plan
  2. Simulation

Probe Mode

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Spectrum Mode enables deeper statistical analysis of your virtual sound system in HOLOPLOT Plan. To enable Spectrum Mode, open the Spectrum Panel from the toolbar. The Spectrum Panel will appear and the cursor will turn into a crosshair, indicating that you can now place acoustic probes.

Placing probes

Using the Spectrum Window

Your probes also appear in the Spectrum Window. All of your probes are listed on the right side of the Spectrum Window with broadband SPL values and buttons to pin or delete probes quickly. Hovering over the probe’s name will highlight both the corresponding frequency response graph to the right and will highlight the probe in the Viewport.

The Spectrum Window displays the frequency response in 1/12-octave band resolution regardless of the selected simulation controls. This graph helps you identify any areas where the signal needs to be adjusted to achieve a balanced frequency response. Additionally, you can compare the frequency response of multiple probe locations, helping you compare the coverage of different areas of the audience. This feature can help you optimize your system's coverage, ensuring that your audience has the best possible listening experience.

Probe Analysis

The probe analysis window offers a detailed look at the behavior of individual probes in your simulation, helping you make informed tuning decisions, especially when working on crossovers.

You can open the window by clicking the spectrum icon next to a probe - either from the probes list in the spectrum panel or directly in the viewport when hovering over a probe.

Inside the window, you’ll find two separate graphs:

  • Magnitude response: Displays the SPL level across frequency, allowing you to see how loud the signal is at each frequency.

  • Phase response: Shows how the phase changes across frequencies, which is useful when aligning beams using delay.

These views are based on simulation data and update as you make tuning changes. Use them in conjunction with the Tuning panel to adjust gain (impacting the magnitude response) and delay (impacting the phase response). This is particularly valuable when setting up crossovers, as you can visually confirm alignment between overlapping beams.

You can place acoustic probes on a zone’s surface by clicking on the surface. A probe dot will appear on the zone, and an info box will pop up with the probe’s X,Y, and Z location when hovered, with SPL data relevant to the bandwidth mode you are using. You can pin a probe with the button and delete a probe with the button.

Activating the Spectrum Mode
Placing a Probe
Using the Spectrum Window