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A/V features

  • Monday, June 11, 2012
    line arrays
    Jeff Berryman 06/11 06:16 PM,
    This is a discussion of line array high-frequency output capability, and what it might mean to you. The specific quantity we’re looking at is the frequency response at maximum output power for all drivers. This is the maximum acoustic output of the array as a function of frequency. I will call this the power-bandwidth response. POWER-BANDWIDTH RESPONSE Here’s a question: what power bandwidth must line array elements have in order to deliver a flat frequency response to audience seats? Because… View this story
    Filed in: AVFeatureProductStudy HallAVLine ArrayLoudspeakerSignalSound ReinforcementAudio

  • Tuesday, June 05, 2012
    church sound loudspeakers
    Kent Morris 06/05 09:17 AM,
    What’s wrong with this scenario? A clean stream of audio, processed through state-of-the-art digital processing devices and amplified by an advanced power amplifier, is delivered to the audience through a cone of paper pulp inside a wooden box. The weak link in this chain is the box, more commonly known as a loudspeaker. Final sound quality of any system is wholly dependent on the ability of loudspeakers to reproduce the glorious audio presented to it by the upstream components. In… View this story
    Filed in: Church SoundFeatureProductAVInstallationLoudspeakerSignalSound ReinforcementSystemAudio

  • Monday, June 04, 2012
    power amplifiers
    Tommy O’Brien 06/04 09:56 AM,
    Back in the mid-1900s, amplifier classes were defined as Class-A, Class-B, Class-D and several others (Class-C, -G, -S, etc). Class-A, Class-AB, and Class-D are the primary topologies found in modern amplifiers, with the other classes largely variations of the three fundamental topologies. Let’s briefly look at the basics of each design. Figure 1 (below) shows an amplifier output stage. A resistor (RL) is the load. However, real loads are loudspeakers, and present a reactance - not a pure resistance -… View this story
    Filed in: AVFeatureStudy HallAmplifierAnalogAVDigitalPowerSound Reinforcement

  • Thursday, May 31, 2012
    Dennis A. Bohn 05/31 02:48 PM,
    You may have heard it said that equalizers are nothing more than glorified tone controls. That’s pretty accurate and helps explain their usefulness and importance. Simply put, equalizers allow you to change the tonal balance of whatever you are controlling. You can increase (boost) or decrease (cut) on a band-by-band basis just the desired frequencies. Equalizers come in all different sizes and shapes, varying greatly in design and complexity. Select from a simple single-channel unit with 10 controls on 1-octave… View this story
    Filed in: AVFeatureStudy HallAVConsolesMixerProcessorSignal

  • Wednesday, May 30, 2012
    Keith Clark 05/30 02:50 PM,
    Craig Janssen began his career in audio-video by mixing for jazz and rock festivals in South Africa before transitioning to engineering audio systems into difficult acoustic spaces. Now, he plies his talents as director of Acoustic Dimensions – an acoustics and performance technology consulting firm that has provided design for a diverse client list, including the Royal Shakespeare Theatre, Lincoln Financial Field, the U.S. Census Bureau, New World Symphony and Saddleback Church. From his work and research in beam theory,… View this story
    Filed in: AVFeatureBlogOpinionAVBusinessEngineerSystemTechnician

  • Tuesday, May 29, 2012
    Volker Schmitt & Joe Ciaudelli 05/29 08:27 AM,
    The position of the antenna and the correct use of its related components—such as the radio frequency (RF) cable, antenna boosters, antenna attenuators, and antenna distribution systems—are key to trouble-free wireless microphone transmission. The antennas act as the “eyes” of the receiver, so the best results can be achieved by forming a direct line of sight between the transmitter antenna and receiver antenna of the system. A large variety of antennas are available for wireless microphone systems. The signal distribution… View this story
    Filed in: AVFeatureStudy HallAVMicrophoneSignalWireless

  • Thursday, May 24, 2012
    power amplifiers
    Tommy O’Brien 05/24 08:11 AM,
    Now that Class-D power amplifiers are common in professional audio, much attention has been directed toward their performance compared to conventional analog amplifiers. Let’s briefly address the question of what Class-D means in order to clear up any confusion, because marketing people have conjured up several fictitious designations. An amplifier that uses its output devices as switches is Class-D. It’s as simple as that. Everything else is analog, so “analog amp” means “not a switching amp.” The phrase “conventional amp”… View this story
    Filed in: AVFeaturePollStudy HallAmplifierAVPowerAudio

  • Tuesday, May 22, 2012
    Josh Thompson 05/22 12:49 PM,
    Sooner or later, regardless of our chosen path in pro audio, the worst happens: someone asks us to install a system. Even if our preferred gig involves a Prevost and chain motors, folks tend to assume that “sound is sound,” and if you are a professional in one area, you are surely qualified in all others. Even with no real hands-on install experience, most of us have no problem signing up for the occasional install gig. The gear looks the… View this story
    Filed in: AVFeatureStudy HallAVInstallationInterconnectSound Reinforcement

  • Wednesday, May 16, 2012
    PSW Staff 05/16 06:47 AM,
    When LifePointe Christian Church in Elk Grove, CA was looking for a sound system to compliment a new location—a converted Harley Davidson showroom—it turned to the expertise of CCI Solutions of Olympia, WA, with project manager David McLain recommending NEXO PS15 loudspeakers for the 400-seat church. Specifically, the new system includes three PS15s and a flown NEXO CD18 subwoofer, all driven and controlled via a 4x4 NXAMP. “Pastor Chris Delfs sought out a new location where they would not only… View this story
    Filed in: AVLive SoundChurch SoundFeaturePollAVInstallationLoudspeakerSubwoofer

  • Monday, May 14, 2012
    Tom Young 05/14 01:03 PM,
    A well-designed main/primary loudspeaker system is expected to provide clear and intelligible sound to the entire audience. Over the years our industry has benefitted from a steadily growing selection of types and configurations of primary loudspeakers to do this; they possess the specific characteristics (performance and physical) that we need in our base inventory, or for a given project, or to solve a specific problem. Many of these varied types of products are also available over a wide range of… View this story
    Filed in: AVFeaturePollAVLoudspeakerSound ReinforcementSystemAudio