The equal loudness contours (often referred to as Fletcher & Munson contours for reason explained below) represent the level that different frequencies need to have in order to be perceived by a listener
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The different types of directional patterns in microphones are a common source of inaccurate graphical representations as well as numerical data that are not entirely correct or complete. In this reference we include a table of complete parameters as well as polar curves.
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The illustrations below show the connection between balanced and un-balanced outputs on different connector types (XLR / Cannon, 14", phono/RCA/cinch) to balanced inputs on XLR and 1/4" connectors.
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There are many types of sound sources that do not require subwoofer reinforcement since they lack low frequency content. For instance, most signals captured by microphones such as voices and instruments in general, except those that do have low frequency content, like double
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The spectra of pink and white noise are often a source of confusion. The difficulty arises from the fact that the spectra of these types of noise (or rather, their graphical representation) will change depending on the type of analyzer that
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In general, two-channel power amplifiers for professional use default to stereo mode. That is, each amplifier channel receives a signal from its input connector and its volume is controlled by that channel's volume control. So, really, although the name of that default mode is 'stereo', it is more of a two-channel mode, since those two channels do not necessarily have to be right and left. For example, they could be two separate channels for the stage monitors of different musicians. Or the high and midrange bands of a multi-amp system
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Octaves, thirds of octaves and decades are divisions of the spectrum used in audio, since they work in the same way as the ear, increasing their width in Hertz as frequency increases, and decreasing it when frequency decreases. They are used for the definition of the width of filters, as well as for the spectral analysis.
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For cost and space saving reasons, some devices often use connectors that integrate both an input and an output, typically on a female 1/4" connector. This type of arrangement
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Although it not specific to sound, we include this document with some basic electricity formulas. They can be found in any electricity textbook, but we have added them to the DoPA Library for reference
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Yamaha has announced the upcoming release of a new Active Field Control (AFC) version upgrade, including the related acoustic enhancement (AFC Enhance) and image control (AFC Image) system.... Read more
Focusrite plc today unveiled a new commercial audio brand, Optimal Audio.
Promising a fresh outlook, Focusrite Group CEO, Tim Carroll explained that Optimal Audio, which becomes the Group’s seventh brand, has reportedly been in development for three years, involving... Read more
Bose Professional last week unveiled the new AMM multipurpose loudspeaker line, comprised of two full-range loudspeakers — the AMM108 and AMM112 — and a companion subwoofer — the AMS115.
Featuring a coaxial two-way design, AMM loudspeakers... Read more
ARX Systems is pleased to announce the launch of the ARX Ultra deBalancer, a 2 channel audio Debalancer and switchable +4dB or -10dB Level Optimizer, specifically... Read more
The state or quality of being understood. It can apply to an idea or a writing, but in our context it relates to the spoken word and, less commonly, to music.... Read more
The importance of cables for the connection between the amplifier and the speaker is often controversial. Hi-fi aficionados spend fortunes on cables that promise spectacular results, and our short auditory memory and subjectivity lead many to confirm these improvements in their systems.... Read more
Constant voltage, high impedance or line transformer systems are often a somewhat confusing concept for professionals used to rock and roll. They are actually very simple to design, among other things because they are intended to be installed by electricians and the like, with little experience in sound systems. In this article we will try to clarify the simple concepts needed to understand this type of system.... Read more
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