For a headphone/speaker, we would measure SPL (Sound Pressure Level), and for a DAC/Amplifier, we would measure voltage. The most basic way to show what a device is outputting is simply to show how the output changes over time. If you think that something is missing, or would like something explained or explored in a little more depth, leave a comment on the forum or come and ask on Discord! The Basicsīefore diving into specific tests and terms, let’s explain the three main ways that measurements of the output of a device can be presented: Oscilloscope/Waveform: The explanations given here will intentionally not go into too much detail and only tell you what you need to know, so that almost anyone can gain a sufficient understanding of a particular term or measurement, but links to additional reading are provided if you’re interested to learn more. What does a particular graph mean? And how is it tested? This article serves as an introduction and guide to audio measurements, and a glossary explaining what all of the different tests and definitions you might see are, how they’re done, and what they represent. But many of these measurements can be a bit difficult to understand at a glance. In recent years, measurements of audio gear have become more widely available with various sources putting out objective testing results of all sorts of headphones, DACs, amplifiers, power conditioners, you name it. Voltage Source Amplifier (Voltage Mode / Voltage Drive):.Switch Mode Power Supply / Switching Power Supply (SMPS):.Surface Mount Device (SMD) / Surface Mount Technology (SMT):.Current Source Amplifier (Current Mode / Current Drive):.Nyquist Reconstruction Filter / Oversampling.Dynamic Intermodulation Distortion (DIM).
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