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How to Use TrueRTA Level 4 for Audio Analysis

TrueRTA is a software that allows you to measure and analyze the frequency response of audio devices and systems. It can display the spectrum of any audio signal in real time, using different levels of resolution. The higher the level, the more precise the analysis.

One of the most advanced levels of TrueRTA is Level 4, which offers a resolution of 1/24 octave. This means that you can see the frequency response in very fine detail, up to 50 kHz. Level 4 also has other features, such as a digitally generated sweep signal generator, a dual trace oscilloscope, a digital multimeter, and a calibration option.

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In this article, we will show you how to use TrueRTA Level 4 for audio analysis. We will assume that you have already downloaded and installed the software from True Audio, and that you have a suitable audio interface and microphone for the measurements. We will also assume that you have purchased a registration code for Level 4, which costs $99.95.

Step 1: Calibrate your audio interface and microphone

Before you start using TrueRTA Level 4, you need to calibrate your audio interface and microphone to ensure accurate measurements. To do this, follow these steps:

1. Connect your audio interface to your computer and your microphone to the input of your audio interface.


2. Launch TrueRTA and click on the Calibration menu.


3. Select Line-In Level Calibration and follow the instructions on the screen. You will need to adjust the input gain of your audio interface until you see a green bar on the meter.


4. Select Line-Out Level Calibration and follow the instructions on the screen. You will need to adjust the output level of your audio interface until you see a green bar on the meter.


5. Select SPL Calibration and follow the instructions on the screen. You will need to place your microphone at a known distance from a sound source (such as a speaker) and enter the sound pressure level (SPL) of the source. You can use an SPL meter or an online calculator to find out the SPL of your source.


6. Select Relative Mode if you want to measure relative frequency response instead of absolute SPL.


7. Select Microphone Calibration Files if you have a calibration file for your microphone. This will correct any frequency response errors of your microphone.

Step 2: Set up your measurement parameters

After you have calibrated your audio interface and microphone, you need to set up your measurement parameters. To do this, follow these steps:

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1. Click on the Setup menu and select Sampling Frequency. Choose a sampling frequency that matches your audio interface and microphone. The higher the sampling frequency, the higher the frequency range that you can measure.


2. Click on the Setup menu and select RTA Resolution. Choose Level 4 (1/24 Octave) for the highest resolution.


3. Click on the Setup menu and select Frequency Scale. Choose a frequency scale that suits your measurement needs. You can choose from linear, logarithmic, or musical scales.


4. Click on the Setup menu and select dB Scale. Choose a dB scale that suits your measurement needs. You can choose from dBu (voltage), dB SPL (sound pressure), or dBA (weighted SPL).


5. Click on the Setup menu and select Display Options. Choose how you want to display your measurement data. You can choose from different colors, fonts, grids, cursors, memories, notes, etc.

Step 3: Perform your measurement

Now you are ready to perform your measurement. To do this, follow these steps:

1. Place your microphone at the desired position where you want to measure the frequency response of your audio device or system.


2. Click on the Signal Generator menu and select Sweep Generator. Choose a sweep type (linear or logarithmic), a sweep range (start and end frequencies), and a sweep time (duration).


3. Click on Start Sweep to generate a sweep signal that will be played through your audio
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