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Easily measure your most demanding audio devices
Keysight AZ2-class audio analyzers include the U8903B. Designed for multifunction and high-performance measurements, Keysight’s audio analyzer offers low residual distortion of less than -110 dB and an analysis bandwidth of 1.5 MHz. This ensures you achieve the highest resolution available for two-channel measurements. With versatile options including Bluetooth® audio measurements, digital audio, and voice quality analysis, our audio analyzer is fully configurable to meet your specific application needs. Experience precision and flexibility in audio testing. Choose one of our popular configurations or configure one specific to your application. Need help selecting? Check out the resources below.
Low residual distortion
Capture residual distortion of less than -110 dB, allowing for highly accurate measurements of demanding audio devices.
Wide bandwidth
Perform wide audio signal analysis bandwidth measurements from 10 Hz to a maximum of 1.5 MHz.
Bluetooth measurement
Measure audio measurements via a Bluetooth link, supporting Bluetooth version 4.0
Multi-channel
Configure with up to eight analog analyzer channels, versatile for various audio testing needs.
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Maximum frequency
80 kHz
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Maximum analysis bandwidth
1.5 MHz
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Phase noise @1 GHz (10 kHz offset)
-110 dB
Typical configuration
AZ2-class Benchtop Audio Analyzer, up to 8 analog channels
- Explore our Extensive Analyzer Catalog
- Buying Guide to Choosing the Right Analyzer
- How to Create a Customer Filter
- Performance Audio Analyzer Fact Sheet
- Measuring High Impedance Sources
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Frequently asked questions
An audio analyzer is a high-precision instrument used to test and evaluate the audio performance of analog and digital devices. It measures key parameters such as distortion, noise, bandwidth, and voice quality with exceptional accuracy, making it ideal for applications in R&D, manufacturing, and wireless audio testing. With support for multiple analog channels, as well as digital interfaces like AES3, SPDIF, and Bluetooth, it enables comprehensive analysis of everything from high-fidelity audio equipment to communication devices.
An audio analyzer is capable of analyzing a wide range of audio signals, including:
- Sine Waves: Sine waves are continuous, smooth oscillations that represent a single frequency with no harmonics or distortion, making them the most fundamental and purest form of sound. In audio testing, sine waves are commonly used to measure key parameters such as harmonic distortion, signal-to-noise ratio, and frequency response. Due to their simplicity, sine waves offer a reliable baseline for assessing the accuracy with which an audio device reproduces a known input.
- Square Waves: Square waves are characterized by abrupt transitions between high and low voltage levels, producing a signal that alternates sharply between two fixed values. These sharp edges contain a wide range of harmonic content, which makes square waves especially useful for testing an audio system’s transient response and bandwidth. They can reveal issues like overshoot, ringing, and phase distortion in amplifiers, speakers, or other audio components.
- Complex Waveforms: Complex waveforms are signals that contain multiple frequencies and varying amplitudes, often resembling real-world audio content such as music, speech, or environmental sounds. These waveforms are used in testing to simulate actual use conditions and to assess how well a device performs under dynamic and diverse signal conditions. Measuring the response to complex waveforms can uncover nonlinearities, compression effects, or signal degradation that may not be visible with pure test tones.
Residual distortion in an audio analyzer refers to the distortion and noise inherently generated by the analyzer itself during the measurement process. It defines the lowest level of total harmonic distortion (THD) and noise the instrument can measure, effectively setting the baseline or "floor" for distortion measurements. This characteristic is critical because it determines the analyzer's ability to accurately evaluate the performance of high-fidelity audio devices. If a device under test (DUT) has lower distortion than the analyzer’s residual distortion, the measurement will be limited by the analyzer’s own imperfections rather than the actual performance of the DUT. A low residual distortion ensures that the analyzer contributes minimal interference to the signal path, allowing precise assessment of audio components such as amplifiers, DACs, and signal processors. This level of performance is particularly important in applications where ultra-low noise and high signal integrity are required, such as professional audio equipment design, high-end consumer electronics, and communication systems.