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A/V features

  • Tuesday, April 16, 2013
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    Bill Whitlock 04/16 05:01 PM,
    “A cable is a source of potential trouble connecting two other sources of potential trouble.” The humor in this statement may be lost on those who regularly assemble sound systems. But a reality of sound systems is that a signal accumulates noise as it flows through equipment and cables. And once noise contaminates a signal, it’s essentially impossible to remove it without altering or degrading the original signal. For this reason, no system can be quieter than its noisiest link.… View this story
    Filed in: AVFeatureBlogStudy HallAVDigitalInstallationInterconnectPowerSignalSound ReinforcementSystem

  • Friday, April 12, 2013
    cable and interconnect
    PSW Staff 04/12 11:09 AM,
    See Part 1, Microphone Cable, here. What are the main parts of a loudspeaker cable, and what does each one do? Typically a loudspeaker cable has two stranded copper conductors, covered with insulation, twisted together with fillers and sheathed with an overall jacket. How big should the conductors be? The required size (or gauge) of the conductors depends on three factors: (1) the load impedance; (2) the length of cable required; and (3) the amount of power loss that can… View this story
    Filed in: AVFeatureBlogStudy HallAVInterconnectLoudspeaker

  • Wednesday, April 10, 2013
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    Dennis A. Bohn 04/10 11:22 AM,
    This article is provided by Rane Corporation.   Mainstream digital audio dates from the introduction of the compact disc in the early 1980s. Today two serial interfaces coexist: AES3 (aka AES/EBU) for professional use and S/PDIF for consumer products. Simple low-cost passive conversion between them is possible—even easy—but it is also filled with cautions. The old rule that direct connection between AES/EBU and S/PDIF equipment is bad practice is relaxed today with new receiver chips tolerant to either interface. With… View this story
    Filed in: AVFeatureBlogStudy HallAVDigitalInterconnectNetworkingSignal

  • Tuesday, April 09, 2013
    clear-com
    Gary Parks 04/09 01:47 PM,
    In an earlier time, rural telephone systems effectively connected everyone along the road into a single communications link, dubbed a “party-line.” By the late 1960s, both Clear-Com and RTS independently adopted the same basic concept with the development of the party-line intercom. Individual beltpack-style intercom stations interconnected with microphone cables allowed the production’s technical staff to call cues and otherwise collaborate in a full-duplex manner throughout the venue – all on one channel. As the need arose, main stations that… View this story
    Filed in: AVFeatureBlogAVDigitalEthernetInterconnectNetworkingSignalSystemWireless

  • Wednesday, April 03, 2013
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    Pat Brown 04/03 10:36 AM,
      There are a number of possibilities for rating a power source. The most straightforward is a simple rating for continuous available power, a product of the maximum voltage (pressure) output times the maximum available current (flow) from the amplifier. This “Volt-Ampere” rating represents the largest number that could be used to characterize the amplifier. For the “ideal” amplifier, we could simply multiply the DC rail voltage times the maximum current available from the power supply into a purely resistive… View this story
    Filed in: AVFeatureBlogStudy HallAmplifierAVPowerSound ReinforcementSystem

  • Monday, April 01, 2013
    live sound international
    Omer Inan 04/01 11:42 AM,
    High-end audio equipment manufacturers pride themselves on consistently delivering robust products that hold up to rough treatment. Unfortunately, the success of any live performance depends on more than just the products themselves: many complex environmental, human, and unknown factors can cause a performance to fail. Radio frequency (RF) interference can compromise the transmission, causing the audio to drop out. The presenter can lean in and nearly swallow the gooseneck microphone head, creating loud pops and bass boost. A drop of… View this story
    Filed in: AVFeatureBlogAVMicrophoneSignalStage

  • Friday, March 15, 2013
    all-pass filters
    Charlie Hughes 03/15 03:29 PM,
    We are all familiar (or at least should be) with a low-pass and high-pass filter. As the name implies, they pass one part of the audio spectrum while attenuating the others. They are the basis for loudspeaker crossovers. As with any analog filter there is phase shift associated with the change in output magnitude of these filters. Examples of these are shown in Figure 1 (below) as fourth-order Linkwitz-Riley filters. If we were to add the output of these filters… View this story
    Filed in: AVFeatureBlogStudy HallAVLine ArrayLoudspeakerMeasurementProcessorSound ReinforcementSystem

  • Wednesday, March 06, 2013
    audio measurement
    Ken DeLoria 03/06 09:57 AM,
    Last time out (here), we looked at early forms of audio measurement equipment, including chart recorders, heterodyne analyzers, and real-time analyzers (RTAs). Now let’s pick it up with fast Fourier transform analyzers (FFTs), which are still in widespread use the world over in a variety of forms. In addition to accurately characterizing audio signals, FFTs are used for vibration analysis, order analysis of rotating machinery, RF and microwave measurements, and many other purposes. One could say they’re the gold standard… View this story
    Filed in: AVFeatureBlogStudy HallAVMeasurementSignalSound Reinforcement

  • Monday, March 04, 2013
    electro-voice
    PSW Staff 03/04 06:52 PM,
    Enter to win Electro-Voice loudspeakers, subwoofers and microphones in the latest PSW Sweepstakes. ProSoundWeb is giving away Electro-Voice prizes in March, April and May. Specifically, for each drawing, we’re giving away: March: Two RE320 premium dynamic microphones valued at $998. April: Two ZLX-12P 12-inch, 2-way powered loudspeakers valued at $1,958. May (Grand Prize): Two ZLX-15P 15-inch, 2-way powered loudspeakers and two ELX118P subwoofers (with poles) valued at $3,285. Three prizes in all — awarded at the end of March, April… View this story
    Filed in: AVLive SoundRecordingChurch SoundFeaturePollProductionAudioAVBusinessMicrophone

  • Tuesday, February 26, 2013
    bandwidth
    John Eargle & Chris Foreman 02/26 04:12 PM,
    Audio signals are, of course, speech and music, and in this article we will examine the nature of those signals in terms of their requirements in bandwidth, dynamic range and normal operating levels. The nature of peak and average levels of music and speech will be discussed. In addition, we’ll look at the standard methods of dealing with signal peaks and required shifts in signal operating levels. AUDIO SPECTRA The data of Figure 1 shows the approximate limits of bandwidth… View this story
    Filed in: AVFeatureBlogStudy HallAVLoudspeakerMeasurementProcessorSound Reinforcement



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