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A/V features

  • Thursday, May 10, 2012
    image
    Pat Brown 05/10 05:01 PM,
    In audio terms, high voltage means that the output power of the amplifier is converted to a high-voltage/low-current signal for transmission over long distances and/or small wire gauges. The advantages of the method include low cost and rather “bulletproof” systems, and the downside is that the transformers required present yet another filter for the signal to pass through, often degrading the audio quality. Since loudspeaker lines should always be kept as short as possible, the ultimate realization of this involves… View this story
    Filed in: AVFeaturePollStudy HallAmplifierAVInterconnectPowerSignal

  • Wednesday, May 09, 2012
    faital pro
    Mike Clark 05/09 02:58 PM,
    Although a relative newcomer to the pro audio world, Faital, headquartered in San Donato, a suburb of Italy’s business capital Milan, has more than half a century of loudspeaker driver manufacturing to its credit. In 2006, the family-run concern launched FaitalPRO, a division of the company targeting the international pro audio market, which has grown by leaps and bounds since inception, as explained by FaitalPRO overseas sales manager Flavio Naggi, grandson of the company’s founder. “Although my father is company… View this story
    Filed in: AVFeatureStudy HallAVBusinessLoudspeakerSound ReinforcementSubwoofer

  • Monday, May 07, 2012
    image
    Bob Thurmond 05/07 05:23 PM,
    How many sound systems have been built and are in use? Many millions, for sure, and they’re found in all types of venues and for all kinds of programs. So one would think we’d know exactly how to do it by now. But there seems to be plenty of examples to prove that we don’t. Why should this be? What is it we don’t yet understand? Do we even know enough to know what we don’t know? Perhaps we should… View this story
    Filed in: AVFeaturePollStudy HallAVInstallationSound Reinforcement

  • Thursday, May 03, 2012
    image
    Dennis A. Bohn 05/03 05:24 PM,
    This article is provided by Rane Corporation.   This is an installment in a multi-part series. Additional segments are available here. Noise Low noise and low voltage don’t like each other. Low voltage usually means portable, and portable always means low current to prolong battery life. You can design low noise and low voltage if you can be a current pig, but if you must have low noise, low voltage and low current—well, that’s difficult. Everything works against you. The… View this story
    Filed in: AVFeaturePollAVDigitalInstallationInterconnectSignalSound ReinforcementTechnicianAudio

  • Tuesday, May 01, 2012
    wireless
    Volker Schmitt & Joe Ciaudelli 05/01 03:26 PM,
    Using radio frequency (RF) wireless microphone transmitters with the right amount of RF output power is important to ensure total system reliability. There is a common misconception that higher power is better. However, in many applications high power can aggravate intermodulation (IM) distortion, resulting in audible noises. First, the applied RF output power must fall within the limit allowed by each country’s legislation. In the U.S., the maximum RF output power for wireless microphones is limited to 250 mW. In… View this story
    Filed in: AVFeaturePollStudy HallAVMicrophoneWireless

  • Friday, April 27, 2012
    av
    John Mayberry 04/27 08:41 AM,
    It’s been 112 years now, and you’d think it’s been long enough. Yet some of the brightest guys in America keep making the same dumb mistakes over and over again. And ignoring the issue hasn’t made it go away either - it just keeps popping up like Baby Boomers and their anticipated Social Security payments… Still, you’d think someone given the responsibility of designing our great facilities would want people to be able to converse and enjoy listening to music… View this story
    Filed in: AVFeaturePollAVMeasurementSignalAudio

  • Wednesday, April 11, 2012
    sound science
    Neil Thompson Shade 04/11 08:14 AM,
    Previously (here and here), we’ve been looking at sound on a “microscopic” level, examining particle motion as sound propagates through air. This time, let’s look at a larger picture of sound wave propagation. A vibrating object will disturb the surrounding air medium causing localized changes in pressure and particle displacement with the transference of acoustical energy in the form of a sound wave. Waves can be broadly classified as being either transverse or longitudinal. The distinction for each wave type… View this story
    Filed in: AVFeaturePollStudy HallAVEducationMeasurementSignalSound Reinforcement

  • Monday, April 09, 2012
    line arrays
    PSW Staff 04/09 10:39 AM,
    Since its founding in 1963, the Boston Ballet has become one of the leading dance companies in the world, and in 2009, moved to its new performance home, the historic Boston Opera House, located in the heart of the city’s theatre district. Now, the ballet is also benefitting from a new sound reinforcement system tailored to support its specific performance requirements. Initially constructed as a tribute to vaudeville impresario Benjamin Franklin Keith and named the B.F Keith Theater, the 2,766-seat… View this story
    Filed in: AVFeaturePollAVConsolesInstallationLine ArrayLoudspeakerSound Reinforcement

  • microphones
    Dennis A. Bohn 04/09 10:23 AM,
    This article is provided by Rane Corporation.   Selecting the right preamplifier for a given microphone, or conversely, selecting the right mic for a given preamp, involves two major factors along with several minor ones. First, the two big ones: Input headroom. Do you have enough? Noise. What will the preamp add to your mic? You need to determine whether the mic, under worst-case conditions, is going to overload the preamp input stage, and also whether the preamp is going… View this story
    Filed in: AVFeaturePollProductStudy HallAVMicrophoneProcessorAudio

  • Friday, April 06, 2012
    balloon data
    Pat Brown 04/06 12:22 PM,
    Two-dimensional graphs are useful for displaying sound system component specifications, but a third dimension is required for considering parameters that are a function of (depend on) a position in space. This includes two data types that are absolutely essential to the sound system designer - loudspeaker directivity data and computer models of auditoriums. Let’s investigate the use of three-dimensional graphs for describing the radiation from loudspeakers. Why is this data needed? Sound radiation is a three-dimensional disturbance that (in most… View this story
    Filed in: AVFeaturePollAVLoudspeakerMeasurementSound Reinforcement





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