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A/V features

  • Friday, November 18, 2011
    cone drivers
    PSW Staff 11/18 08:43 AM,
    (Editor’s Note: Eminence Speaker LLC contributed to this report.) Cone drivers (also referred to as woofers and transducers in this article) are not overly complex. When an electrical current passes through a wire coil (the voice coil) in a magnetic field, it produces a force that varies with the current applied. The cone, connected to the voice coil, moves in and out, creating waves of high and low air pressure. The coil and magnet assembly are the “motor structure” of… View this story
    Filed in: AVFeaturePollSlideshowStudy HallAmplifierAVLoudspeakerManufacturerMeasurementPowerSignalSound ReinforcementSubwooferAudio

  • Thursday, November 17, 2011
    Pat Brown 11/17 01:51 PM,
    9V Transmitter For the 9V transmitter I used the Shure SC1-TA. It has a relatively low current drain (50mA) that remains relatively constant with increasing time until the battery voltage is insufficient (6.5V) to keep the unit on. This is a VHF system. AA Transmitter For the AA testing I used the Lectrosonics SM. It is an ultra-miniature digital hybrid UHF transmitter than runs from a single AA cell. The current draw is voltage-dependent. The transmitter turns off when the… View this story
    Filed in: AVFeaturePollAVPowerSignalWirelessAudio

  • Monday, November 14, 2011
    Craig Leerman 11/14 04:11 PM,
    Long ago, an old sound guy imparted to me words of wisdom about the optimum way to mic instruments: “Pick your best microphone, put it on your best stand, place it in the best spot, point it in the best direction, and hope for the best.” That statement seems a bit trite, but it also contains truth. So where do we start in this pursuit of the “best” in all aspects of instrument mic’ing? While it’s true that vocal mics… View this story
    Filed in: AVFeaturePollSlideshowAVMicrophoneSound ReinforcementStage

  • Friday, November 04, 2011
    Ethan Wetzell 11/04 09:49 AM,
    The professional audio industry in 2011 has been abuzz yet again with a recurring theme that I like to refer to as the “can’t we all just get along?” conversation. As in years past, the topic of unifying standards between different manufacturers’ equipment to make exchange of information easier and more seamless was everywhere. This has been going on for some time, and has lived under different names and terms: “interconnectivity,” “convergence,” and the most recent model, “interoperability.” However, this… View this story
    Filed in: AVFeaturePollAVEthernetInterconnectNetworkingSignal

  • Friday, October 28, 2011
    fiber optics
    John Lopinto 10/28 02:11 PM,
    With the increasing trend toward the use of fiber instead of co-ax cable in a wide range of applications, most contractors are now required to understand the basics of terminating and laying fiber optic cable. Contrary to its reputation, fiber is actually quite easy to handle and use. Cable Construction Fiber, at its most basic level, is a very pure strand of glass through which light can pass over great distances. All fiber optic cable has at its center a… View this story
    Filed in: AVFeaturePollAVDigitalEthernetInstallationInterconnectNetworkingSignalAudio

  • Monday, October 24, 2011
    PSW Staff 10/24 02:15 PM, 0 Comments
    The common “wisdom” just a few years ago was that the emergence of self-powered loudspeaker lines with enclosure-mounted amplifiers and protection circuitry tuned specifically for the loudspeaker meant the days of rack-mounted power amplifiers were numbered. But it’s funny the difference that innovation can make. Today’s amplifier is a powerhouse, light years removed from the huge, heavy and inefficient designs of the recent past. Current designs are also far lighter, and in some cases, come in a compact package that… View this story
    Filed in: AVFeaturePollSlideshowAmplifierAnalogAVDigitalSound Reinforcement

  • Tuesday, October 18, 2011
    Pat Brown 10/18 01:01 PM,
    Almost every Syn-Aud-Con seminar has attendees from other technical fields that need to learn about sound systems and audio. These fields include networking, telephony, lighting, electrical and others. Many tell us that audio is the most confusing thing they have encountered in their technical careers – and it is no wonder. Consider the input types that may exist on a mixing console. I found all of these on units sitting around the shop. There are nine (9) analog topologies and… View this story
    Filed in: AVFeaturePollAnalogAVDigitalEthernetInterconnectNetworkingSignal

  • Tuesday, October 11, 2011
    Pat Brown 10/11 04:07 PM, 0 Comments
    Site surveys are a necessary part of all construction trades. The ground must be firm enough to support the building. The water must drain properly. There must be adequate ingress and egress. The list goes on. Sound system designers should also perform a site survey of the auditorium to determine the conditions in which the new sound system must operate. There are a multitude of parameters that can be measured in a building, but it won’t be possible, practical or… View this story
    Filed in: AVFeaturePollAVBusinessInstallationInterconnectLoudspeakerSignalSound ReinforcementSystemAudio

  • Monday, October 03, 2011
    Pat Brown 10/03 06:51 AM, 2 Comments
    A letter to a church building committee might read: Thank you again for the opportunity to provide you with a proposal for the sound system for your house of worship. While we appreciate your interest in “good stewardship” in the funding of this project, and understand your request for “church pricing” for the work, the following points should be kept in mind when determining the best value for the dollars spent. #1 - Dynamic Range Church sanctuaries are usually quieter… View this story
    Filed in: Church SoundFeaturePollStudy HallAVBusinessInstallationInterconnectSound ReinforcementSystemAudio

  • Wednesday, September 28, 2011
    John Roberts 09/28 05:05 PM, 3 Comments
    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: AVFeaturePollStudy HallTrainingAVInterconnectLoudspeakerSignalSound ReinforcementAudio