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A/V features

  • Tuesday, October 09, 2012
    Bruce Bartlett 10/09 11:32 AM,
    Portable loudspeakers are amazing in their versatility, able to serve as mains, fills, delays, stage monitors and much more, providing solutions for hundreds of applications in live sound reinforcement. These 2-way miracle workers usually include an 8-inch, 12-inch or 15-inch ported woofer and a compression driver on a horn or waveguide, with dispersion (6 dB-down points) commonly at 40 degrees (v) by 90 degrees (h) or 40 degrees (v) by 120 degrees (h). The primary purpose of this dispersion is… View this story
    Filed in: AVFeatureProductAVLoudspeakerSignalSound ReinforcementSystemAudio

  • Monday, October 08, 2012
    tech talk
    Charlie Hughes 10/08 02:37 PM,
    To determine the input impedance of a device, both the voltage across the device and the current flowing into the device must be known. The impedance is simply the voltage across the device E, divided by the current flowing into it, I. This is given by the following equation: It should be understood that since the voltage, E, and the current, I, are complex quantities the impedance, Z, is also complex. That is to say impedance has a magnitude and… View this story
    Filed in: AVFeatureStudy HallAVLoudspeakerMeasurementSignalSoftwareSound ReinforcementSystem

  • Thursday, October 04, 2012
    Jeff Kuells 10/04 04:46 PM,
    Do you really care if the power amplifier you’re using is a MOSFET (Metal Oxide Semiconductor Field Effect Transistors) or Bipolar design? Probably not, at least as long as the amplifier continues to perform. With modern amplifiers, few people notice the difference between the designs until the amp fails and they receive the repair bill. That’s when most people take a special notice. Keeping that in mind, let’s walk through some of the advantages, disadvantages and myths of these two… View this story
    Filed in: AVFeatureStudy HallAmplifierAVPowerSignalSound ReinforcementSystemAudio

  • Monday, October 01, 2012
    Bruce Bartlett 10/01 10:09 AM,
    In designing a live sound system, you’ll come up with all sorts of questions, such as: One power amplifier is rated at 1,000 watts, and a different brand is also rated at 1,000 watts. Do they actually produce the same power? Suppose you add more loudspeakers in parallel to a power amp output. Does the amp produce more power, less power, or the same? Does each loudspeaker have to handle more or less power as you add more loudspeakers? To… View this story
    Filed in: AVFeatureStudy HallAmplifierAVEducationPowerSignalSound Reinforcement

  • Friday, September 28, 2012
    commercial integrator
    Daniel L. Newman 09/28 11:26 AM,
    This article is provided by Commercial Integrator   It seems as if every couple of years the brethren of Harvard Business come up with a buzzword to preoccupy industry. Almost in “Wag The Dog” fashion, the words take hold and prevent us from thinking clearly about what it is we really do that would make a customer want to work with us. Instead, sentences littered with buzzwords plaster themselves across our company mission statements, websites, and marketing collateral as we… View this story
    Filed in: AVFeatureOpinionAVBusinessSystemTechnician

  • Friday, September 14, 2012
    loudspeaker impedance synaudcon
    Pat Brown 09/14 03:18 PM,
    Multiple loudspeakers can be connected in series or parallel to the output of the amplifier. In either case, the current drawn from the amplifier is determined by the total impedance of the load as presented to the loudspeaker terminals. Impedance is the opposition to the flow of current. As the load impedance is decreased, the load on the amplifier is increased, because it must work harder to supply the demand for current. In similar fashion, an automobile trying to maintain… View this story
    Filed in: AVFeatureStudy HallAmplifierAVInstallationInterconnectLoudspeakerPowerSound ReinforcementAudio

  • Thursday, September 13, 2012
    digital audio
    Al Keltz 09/13 03:03 PM,
    Latency is delay that occurs in audio systems due to the time it takes for sound to travel from place to place, and/or due to the time it takes for digital components to perform calculations. However, anecdotal effects of latency sometimes reach almost mystical proportions. We’ve been told about a certain “psycho-acoustic” phenomenon that causes singers to become disoriented, even with extremely small amounts of latency. Then there was a tale of a drummer that was being “driven crazy” because… View this story
    Filed in: AVFeatureStudy HallAVDigitalNetworkingProcessorSignalAudio

  • Wednesday, September 12, 2012
    apple ipad
    Daniel L. Newman 09/12 09:24 AM,
    This article is provided by Commercial Integrator   The touchpanel is not in any danger of going away. Nope, no danger at all. In fact, touchpanels are going to be used more in commercial electronics integration. Every installation over $2,000 may soon be sporting a shiny, new, large-screen, high-resolution touchpanel. I am also prepared to declare a winner of the touchpanel debate. With Crestron, AMX, and Extron appearing to be the market leaders, it isn’t easy to name a winner… View this story
    Filed in: AVFeatureTrainingAVBusinessInterconnectNetworkingRemoteSoftwareAudio

  • Thursday, September 06, 2012
    system power
    Bill Whitlock 09/06 04:56 PM,
    An analog audio interface may be unbalanced or balanced, depending only on the impedances (to ground) of its two signal conductors. In balanced interfaces, both conductors have equal (and non-zero) impedances. A balanced interface also requires that driver, line, and receiver all maintain balanced impedances to ground. They are therefore extremely potent in preventing all kinds of noise coupling, in fact, so powerful that many systems, such as telephone networks, use them instead of shielding as the main noise reduction… View this story
    Filed in: AVFeaturePollStudy HallAVInterconnectSignalSystemAudio

  • Wednesday, September 05, 2012
    psw study hall acoustics rt
    Jeff D. Szymanski 09/05 11:55 AM,
    In working with sound and acoustics, here’s something many of us do but may not actually think about enough: Comparisons between measured and predicted reverberation times (RTs). RT (a.k.a., “RT60,” “T60,” “T,” et al) is a widely used quantifier of the acoustical behavior of a room. Sound decays in a room. (Albeit less quickly in some rooms than in others, as we’re all painfully aware.) RT is defined as how long it takes sound in a room to decay by… View this story
    Filed in: AVFeaturePollStudy HallTrainingAVMeasurementSignalSoftwareSound ReinforcementAudio

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