Reference

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 ...

The following table shows the resulting damping factor, signal loss, attenuation and impedance for different loudspeaker ...

In this article we'll explain impedance calculations as simply as possible, as well as describe the different types of connection. ...

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 ...

Tables for conversion from Q to B/W (bandwidth) for DSP bell-type EQ. ...

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 ...

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. ...

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 ...