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Amplifier Testing & Measurement | Audio Precision | The Global Leader

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Amplifier Testing & Measurement | Audio Precision | The Global Leader Skip to primary content AXIOMETRIX SOLUTIONS FAMILY Language / Region China Deutsch Japanese 한국어 United Kingdom +1 (800) 231-7350 Contact Us General Sales Service About About Us Careers News Login Main Brand menu Skip to primary content Audio Analyzers APx555 B Series APx52x B Series APx58x B Series APx517 B Series APx516 B Series APx515 B Series APx511 B Series APx500 Flex Audio Analyzer APx Interfaces & Modules Audio Accessories Legacy Products Applications Amplifier Testing Bluetooth® Headphones Hearing Aids Loudspeakers MEMS Mics & Mic Arrays Production Test Smart Devices Audio Software Latest Software Software Licensing Software Subscription 30-Day Trial APx500 Flex Analyzer Software Search Engine Service & Support Technical Support Service & Calibration APx500 Not Functioning on Your Computer? Knowledge Center Technical Library Blog Events, Trade Shows & Webinars News Join Our Community Search Home » Applications » Amplifier Testing arrow_drop_up Amplifier Testing Audio amplifiers are essential in audio systems, designed to increase weak audio signals to drive speakers and produce sound. While each type of amplifier boosts audio, the way they handle signals, manage heat, and affect audio quality varies significantly, leading to different classes of amplifiers with unique advantages and trade-offs. The main amplifier types—Class A, B, AB, and D—offer differences in sound fidelity, efficiency, and practicality which may affect which design is best according to various audio applications. 

Class A amplifier: Class A amplifiers operate with current flowing continuously through output transistors, resulting in smooth, linear signal amplification. Known for their excellent sound quality with very low distortion, Class A amplifiers are inefficient, generating significant heat and consuming more power. They’re favored in high-end audio systems where fidelity is paramount. 

Class B amplifier: In Class B amplifiers, two transistors each handle one half of the audio waveform. This design greatly improves efficiency but can cause “crossover distortion” at the point where the two halves of the signal meet, which may compromise audio quality. 

Class AB amplifier: By combining the principles of Class A and Class B, AB class amplifiers reduce crossover distortion and improve efficiency. They’re a balanced choice for both home and professional audio systems, offering good sound quality with moderate power consumption. 

Class D amplifier: Known for their high efficiency, Class D amplifiers use pulse-width modulation (PWM) to switch transistors on and off rapidly. This design minimizes heat and makes Class D amplifiers ideal for portable and high-power applications, with modern versions producing excellent audio quality. 

How do you setup an amplifier for audio measurement? Measurement setup is critical for nearly all applications, and for amplifiers this is no different. Audio analyzers are highly effective tools for audio power amplifier measurements, as they can handle the wide voltage and frequency ranges commonly seen in audio amplifier testing. 

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What are the most common measurements for amplifier testing? Amplifier testing is unique among audio measurements because of the high power levels involved, as well as the amplifier’s direct effect on audio signal quality across various loads and conditions. Measuring amplifiers requires precision and careful calibration, as tests need to address how amplifiers manage power, distortions, and noise under realistic conditions. Amplifier tests are usually conducted at an output power of 1 watt as a standard reference level and can be done using an Audio Precision analyzer along with the APx500 measurement software. 

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Technotes Measuring Microphone Preamplifier Noise Making noise measurements of microphone preamplifiers (and other high-gain circuits) involves special techniques that differ from those used to measure low-gain devices. This technote explains the theory as well as how to make these measurements.

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Measuring Low-Power ADCs with the APx555 ADC Test Option Technote 136 explains how to test a low power audio IC device with ADC Test option-equipped B Series APx555 audio analyzer (or Legacy APx555 with enhanced analog generator (EAG) upgrade and ADC test option). 

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Transfer Function Measurements with APx500 Audio Analyzers Technote 138 discusses the Transfer Function measurement added to APx500 audio measurement software in release version 5.0. We provide background information on transfer function measurements in general, followed by some practical examples of applying this measurement technique to some difficult audio test problems.

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Measuring Switch-mode Power Amplifiers Switch-mode audio power amplifiers are becoming increasingly popular due to their smaller size, lower weight, and improved efficiency. Their advantages are obvious in low power battery operated personal audio players and laptop computers. However they are also progressively displacing more traditional linear designs in mainstream applications such as home entertainment systems, automotive sound systems, and professional installations where high quality audio is important.

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Contact Us Are you seeking more information about Audio Precision’s solutions, interested in configuration or pricing options, or do you need a demo? Let us know what you’re looking for and one of our sales or support engineers will promptly reach out to assist you.

TALK TO AN EXPERT

About Audio Precision Since our founding in 1984, Audio Precision® (AP) has evolved into the worldwide leader for audio analyzers and audio testing. We maintain a singular focus: to help engineers worldwide design,validate, characterize, and manufacture audio components, products and systems.

Fast forward forty years and AP is the recognized global standard in audio tests. We provide elite audio analysis, audio measurement software, and a wide range of modules, options and accessories to support analog and digital audio measurement, as well as electro-acoustic testing,and much more.

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Beaverton, OR 97008 USA

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