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A/V features

  • Friday, April 27, 2012
    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

  • Thursday, April 05, 2012
    loudspeaker wire
    John Roberts 04/05 01:46 PM,
    Too many good folks have been separated from their hard earned money by hyperbolic claims about loudspeaker wire. There will always be people with more dollars than sense, but they don’t last very long in professional audio. I speculate there aren’t many (if any) of you who would pay thousands, or even tens of dollars per foot for speaker wire. A very basic practice in merchandising is called differentiation. Marketers must come up with reasons for why you should buy… View this story
    Filed in: AVFeatureStudy HallTrainingAVEducationInterconnectMeasurementSignalSound ReinforcementStudio

  • image
    Al Keltz 04/05 01:42 PM,
    Unbalanced Lines Unbalanced signal lines are characterized by the fact that the cable and connectors use only two conductors, a center conductor surrounded by a shield. Examples of unbalanced wiring are found in tip/sleeve 1/4-in guitar cords or the cables used with many CD players and tape decks which terminate with RCA phono type connectors. In an unbalanced configuration, the shield surrounds a single center conductor. The shield stays at a constant ground potential (as it is connected to ground… View this story
    Filed in: AVFeaturePollStudy HallAVBusinessInstallationInterconnectSignalSound ReinforcementSystemAudio

  • Tuesday, April 03, 2012
    Julie Knudson 04/03 09:39 AM,
    This article is provided by Corporate Tech Decisions   Before A/V and IT systems started merging together into one overall network, organizations typically managed each system separately. Data signals were routed through IT’s servers and sent out to end users over Cat-5 cables, video traffic was contained within its own platform and ran over coaxial cable, and phone calls transited a private branch exchange (PBX) system before being carried to the desktop via an old school Cat-3 cable. The systems… View this story
    Filed in: AVFeaturePollAVBusinessInterconnectNetworkingSignalAudio

  • Monday, April 02, 2012
    Dennis A. Bohn 04/02 02:33 PM,
    This article is provided by Rane Corporation.   This is the first in a multi-part series. Additional segments are available here. We live in an interesting age full of mind-numbing technical advancements and funny contradictions. It’s ironic in this computer age with corporate predictors saying that low-voltage audio information appliances are the next big thing that a completely mechanical device consisting of a platform, a stick and two wheels was just as popular as one of the most sophisticated computers… View this story
    Filed in: AVFeaturePollAVDigitalInstallationInterconnectSignalSound ReinforcementTechnicianAudio

  • Wednesday, March 21, 2012
    unbalanced inputs and outputs
    Bill Whitlock 03/21 05:33 PM,
    Based on my years of helping customers solve interfacing problems of all sorts, connecting unbalanced outputs to balanced inputs, and vice-versa, certainly ranks among the most common and confusing of tasks for system integrators. Basically, two issues must be dealt with. The first involves the different signal operating levels between unbalanced (consumer) and balanced (professional) equipment. The second involves making the actual connections to transfer the signal while avoiding “ground loop” noise problems. Signal operating and reference levels are significantly… View this story
    Filed in: AVFeaturePollStudy HallAVInterconnectPowerSignalAudio