• Reference RSS Feed

    Avance del artículo

    How much high frequency is lost over long distances? ...
    Avance del artículo

    In the loudness contours reference, we learned that the frequency response of the human ear is not flat and it also varies ...
    Avance del artículo

    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 ...
    Avance del artículo

    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. ...
    Avance del artículo

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

    Maximum speaker cable lengths for :


    • Low impedance (2, 4, 8 and 16 ohm)
      • Quality
      • 3 dB loss, which could be an alternative to a line transformer system

    • High impedance (systems with line transformer)
      • 70V
      • 100V

    ...
    Avance del artículo

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

    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. ...
    Avance del artículo

    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 ...
    Avance del artículo

    This article will explain loop-though connections and "y-cables" for analog audio signals. ...
    Avance del artículo


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

    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 ...
    Avance del artículo

    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 ...
    Publicado el 16 ene 2019 15:19
    Avance del artículo

    Pin asignments for an assortment of connectors: XLR, 1/4" (jack), 1/8" (minijack), SpeakON, DB25, DMX ...

    ...
    Avance del artículo

    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. ...
    Avance del artículo

    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 ...
    Avance del artículo

    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 ...

  • Ad

  • News

    Yamaha announces Active Field Control upgrade


    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 unveils new brand : Optimal Audio

    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 launches AMM multipurpose stage monitors


    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 launches Ultra deBalancer

    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
  • Recent articles

    Intelligibility and its measurement

    1. What is intelligibility?

    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

    Choosing loudspeaker cable

    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 systems (70V, 100V lines)

    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
  • PAcalculate app