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A/V features

  • 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

  • Saturday, March 17, 2012
    loudspeakers
    Pat Brown 03/17 01:27 PM,
    A loudspeaker array is a collection of loudspeakers that is assembled to achieve a coverage pattern that cannot be achieved with a single device. Arrays are most commonly implemented to achieve a wide horizontal coverage pattern from a position on or above the stage. The “perfect” array would be a collection of loudspeakers whose radiation pattern was indistinguishable from a single (hypothetical) device that provided the needed pattern for the audience area. Many attempts have been made to solve the… View this story
    Filed in: AVFeaturePollStudy HallAVLoudspeakerMeasurementSound Reinforcement

  • Wednesday, March 14, 2012
    live sound
    Courtney Roebuck 03/14 05:47 PM,
    Ever wonder how to cue an ensemble in the dark? Just grab a few 220-ohm resistors and some light-emitting diodes and you’re halfway there. Shenandoah University in Winchester, VA made a mark on innovation and ways to experience music as an audience member with a recent percussion ensemble performance of “Pika-Don” by American composer James Tenney. The piece is a musical representation of a percussion ensemble paired with prerecorded voiceover tracks of writings taken from the scientists at the first… View this story
    Filed in: AVFeaturePollAVConcertInterconnectSound ReinforcementSystemAudio

  • Wednesday, March 07, 2012
    image
    Pat Brown 03/07 02:35 PM,
    One of my favorite field tools is a basic analog impedance meter. It can be used to troubleshoot a host of sound system problems, either stand-alone or with some additional gadgets. The TOA ZM-104 has been around for many years and many experienced audio people have one. Mine has served me well and has the scars to prove it. It will be the example meter used in this article, although in principle the tests can be conducted using any similar… View this story
    Filed in: AVFeaturePollStudy HallAnalogAVInstallationInterconnectSignalSound ReinforcementSystemAudio

  • Tuesday, March 06, 2012
    qsc
    Gerry Tschetter 03/06 01:15 PM,
    The terms +/-3 dB and -6 dB are frequently (and erroneously) used interchangeably to characterize the frequency response of a loudspeaker system. This has led to understandable confusion among consumers who may believe that a +/-3 dB specification is more rigorous than a -6 dB specification. The purpose of this document is to explain the meaning of both specifications as they are commonly used (or misused) in pro audio today, and to provide a basis for comparing loudspeakers with differing… View this story
    Filed in: AVFeaturePollStudy HallAVLine ArrayLoudspeakerMeasurement

  • Monday, February 27, 2012
    installed sound
    Pat Brown 02/27 12:53 PM,
    Why a “70-volt” system? A good question, and one that causes a lot of confusion among audio practitioners. Some common misconceptions about 70-volt (actually 70.7-volt) distribution systems: • There is 70.7 volts on the line at all times. • The 70.7 volts is a “carrier” that the audio is riding on. • A voltmeter across the line should measure 70.7 volts during the operation of the sound system. And there are many more. With that in mind, let’s take a… View this story
    Filed in: AVFeaturePollStudy HallAVBusinessInstallationInterconnectNetworkingSignalSound ReinforcementSystemAudio

  • Friday, February 24, 2012
    image
    Jim Pfitzinger 02/24 12:50 PM,
    Editor’s Note: While this article discusses delays in a theater environment, the information can be applied to any situation. In an ideal world, the best system would be a single point source that would cover every single seat in the house at the same level with the same frequency response. This is easy to state, tough to execute. Most theaters have walls, ceilings, domes, balcony boxes and balcony fronts, chandeliers, canopies, sidewall projections, pillars, pilasters, plaster pachyderms, which get in… View this story
    Filed in: AVFeaturePollStudy HallAVEngineerInstallationLoudspeakerProcessorSignalSound ReinforcementSystemAudio

  • microphone specs
    Mikkel Nymand 02/24 12:21 PM,
    When reading microphone specifications, it is extremely important to understand how to interpret them. In most cases, the specifications can be measured or calculated in many different ways. While microphone specifications provide an indication of a microphone’s electro-acoustic performance, they will not give a total appreciation of how it will sound. Specifications can detail objective information but cannot convey the subjective sonic experience. For example, a frequency response curve can show how faithfully the microphone will reproduce the incoming pure… View this story
    Filed in: Live SoundFeaturePollProductStudy HallAVMicrophoneSound ReinforcementStageAudio

  • Thursday, February 23, 2012
    audio fiber optics
    Buddy Oliver 02/23 02:46 PM,
    An easy way to understand how fiber optics works: visualize peering into a very long tube, the inside of which is coated with a perfectly mirrored surface. One mile away, at the opposite end, a friend shines a bright flashlight into the tube. Because the tube is internally coated with a perfect mirror, you will see his light perfectly at your end, regardless of how many twists and turns the pipe takes. If your friend flashes the light off and… View this story
    Filed in: Live SoundFeaturePollStudy HallAVDigitalEthernetInterconnectSignalSound ReinforcementStudioAudio

  • Monday, February 20, 2012
    image
    Pat Brown 02/20 01:03 PM,
    If acoustic parameters sometimes seem difficult to grasp, this practical example should help clarify at least one of them, the Limiting Distance, DL. This is a parameter associated with reverberant spaces, such as gyms and churches with little absorption. Remember that in such spaces there will exist a reverberant sound field LR, that is uniform throughout the space, as well as specific reflections that are not. If a loudspeaker or other acoustic source is used to excite the space, there… View this story
    Filed in: AVFeaturePollStudy HallAVEducationEngineerInstallationMeasurementSound ReinforcementSystemAudio