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    One of the many confusing issues in professional audio is that of loudspeaker power handling. On one side, manufacturers use a variety of terms such as peak, RMS, average or program power. On another side, there exist differing methods to determine the power handling of speaker system or component which yield different results. We will ...
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    It not uncommon to have the need to control the volume (dynamics) of a signal in an automated way.

    We may be trying to avoid too high a level that will clip an amplifier or deafen the audience or send a speaker cone excursing to hyperspace. ...
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    This article will go through compressor controls and how to use them for a variety of applications. ...
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    In this article we'll go through noise gate control and how to use them in different applications. ...
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    Measured in ohms (symbol, Ω, upper case Greek letter omega), electrical impedance is defined as the opposition to the flow of alternating current by means of presenting an electrical load. In a loudspeaker, impedance varies with frequency, so manufacturers often publish "impedance curves" showing impedance with frequency for passive units. These curves give us ...
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    There are two basic ways to carry an electrical audio signal.


    • The first one is unbalanced. The signal is carried on a two-conductor cable. Unbalanced signal connectors have two pins, such as the RCA (also called Phono and Cinch, commonly used by home hi-fi equipment) and the unbalanced 1/4" (used in musical instruments and semi-professional audio). Multi-pin connectors can also carry unbalanced signal, although they will not use all pins). For example, a three-pin XLR (Cannon) might carry an unbalanced signal, leaving one pin unused.
    ...

    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.

    The truth is that there are very few serious studies on the importance of the cable in relation to the perceived sound quality. A cable has impedance (opposition to electric current as a function of frequency), capacitance (behaves to some extent like a capacitor) and inductance (behaves like a coil). However, a few years ago an AES article concluded that the differences between cables were very small in terms of capacitance and inductance, and only recognized the importance of impedance.

    ...
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    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. ...
    Publicado el 08 jun 2020 07:22
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    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. ...

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    inMusic acquires ArKaos

    Fort Lauderdale, FL USA (October 27, 2020) inMusic, the has announced the acquisition of ArKaos.

    Founded in 1996, ArKaos specializes in video processing technologies,... Read more

    Meyer Sound launches Spacemap Go, a tool for spatial sound design and mixing

    Meyer Sound has officially released Spacemap® Go for spatial sound design and mixing. Available now as a free app for Apple iPad (any iPad capable of running the latest iPadOS), Spacemap... Read more

    Bose unveils L1 Pro family


    These three new portable Bose PA systems are designed to give artists choices, suit different styles and audiences, and provide an solution for creators reintroducing live music and sound experiences into venues and online platforms across... Read more

    ClearOne BMA 360 beamforming microphone array ceiling tile

    ClearOne (NASDAQ:CLRO), provider of audio and visual communication solutions, has announced its new BMA 360, reportedly the world’s most technologically advanced Beamforming Microphone Array Ceiling Tile.

    The ClearOne BMA 360 is the world’s first truly wideband,... Read more
  • Recent articles

    Power amplifier modes : stereo, parallel and bridge mono

    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... Read more

    Basic electricity formulas

    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.

    Ohm's law

    The most basic formulas derive from Ohm's law, which specifies that the electric current between two points is proportional to the potential difference (voltage) between them and inversely proportional to the resistance between them. The formula is:
    V
    I = ———
    Z


    where I is the current (intensity) in amps and V is the voltage in volts. Since we use alternating current in audio, we have replaced resistance with impedance (Z, and this could also be resistance R), measured in ohms. Clearing Z and V we have these other two formulas:

    V
    Z = ———
    ... Read more

    Y-cables, looping audio signals through

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

    To obtain one or more copies of a signal (for example, to distribute the signal from a mixer to various self-powered speakers or power amplifiers) we use parallel connections. To do this we simply connect each terminal (pin) of the connectors in parallel. That is, 1 to 1, 2 to 2 and 3 to 3 (or tip to tip, ring to ring and sleeve to sleeve in a TRS connector). When we split a signal in two in this way, we refer to a "Y-cable" or "Y" connection, since the division of a signal in two looks like letter "y". Contrary to what it may seem, a y-cable is not a technically incorrect solution, but a correct way of splitting the audio signal. In fact, when a self-powered loudspeaker system or one channel of... Read more
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