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A/V features

  • Wednesday, September 21, 2011
    amplifiers
    Tommy O’Brien 09/21 12:57 PM,
    Among lesser-known amplifier classes – yet viable and employed in pro audio applications - are Class-G and Class-H topologies. Unlike some of the “hybrid” designs touted as “unique” topologies by some in the amplifier development community, these two designs are fairly distinct. That said, there is some disagreement among the amplifier “experts” on the exact definitions of Class-G and Class-H. For purposes of general discussion, when more than one voltage rail is employed, or a pair of rails is used… View this story
    Filed in: AVFeaturePollAmplifierAVPowerSignal

  • Tuesday, September 20, 2011
    digital consoles
    Craig Leerman 09/20 02:37 PM,
    Having a roomful of high-qualify professional audio gear is great, but it’s not a system until you can connect everything together. The hub for system interconnectivity is the mixing console, nowadays usually a digital model. While digital consoles save us the time and cables in not having to hook up racks full of EQs, effects processors, gates, and compressors, there are still a multitude of signals flowing to and from the console that all need to be connected. Typical inputs… View this story
    Filed in: AVFeaturePollProductSlideshowAVConsolesDigitalInterconnectMonitoringNetworking

  • Friday, September 16, 2011
    prosoundweb a/v
    Dennis A. Bohn 09/16 01:59 PM, 0 Comments
    This article is provided by Rane Corporation. In the USA, in spite of all the hoopla about digital-this, digital-that and fiber-optic-whatever, the truth is that many small commercial paging and music-on-hold applications still involve interfacing with the plain old telephone service, or “POTS”. (By contrast, if you work in the EU business place, then you will rarely run into POTS, since it has almost all been converted to ISDN.) Meanwhile, back in the USA: if you are lucky, the telephone… View this story
    Filed in: AVFeaturePollAVInstallationInterconnectAudio

  • Thursday, September 15, 2011
    amplifiers
    Pat Brown 09/15 08:42 AM,
    Click here to view/download a printable pdf of this article. I’ve done enough theorizing and musing about power and power ratings in part 1 and part 2 of this series. Let’s convert some utility power into audio power. First, some details about the testing. The Source, The Load “Source” and “load” are usually associated with amplifier and loudspeaker. I had to zoom out another level and consider the AC source to the amplifier (these amplifiers need a lot of juice).… View this story
    Filed in: AVFeaturePollProductAmplifierAVInterconnectMeasurementSignal

  • Wednesday, September 14, 2011
    crossovers
    John Lenard Burnett 09/14 10:03 AM,
    This article is provided by Lenard Audio.   Read John’s introduction to crossovers here and his discussion of passive crossovers here. Active systems can be 2-way, 3-way, or 4-way.  The line level signal from the preamplifier or mixer is electronically filtered into the correct frequency bands to be sent to independent amplifiers that drive the bass loudspeaker, mid loudspeaker and tweeter separately.  The auditory difference between an active and passive loudspeaker system is noticed by everyone. A correctly set up… View this story
    Filed in: AVFeaturePollAVEducationProcessorSignalAudio

  • Tuesday, September 13, 2011
    qsc
    Greg DeTogne 09/13 01:25 PM, 0 Comments
    Building quietly and moving with unstoppable force downfield just like the University of Alabama’s Crimson Tide, audio for Bryant-Denny Stadium found new strength this year just prior to the kickoff of the NCAA college football season. Now capable of seating 101,821 fans, the venerable stadium has undergone a continuing series of renovations since 1998 that concluded in 2010 with an expansion of seating above the south end zone. This latest renewal effort effectively closed the open-air bowl on all sides,… View this story
    Filed in: AVFeaturePollAmplifierAVInstallationLine ArrayLoudspeakerNetworkingProcessorSound ReinforcementAudio

  • Monday, September 12, 2011
    sound card
    Pat Brown 09/12 05:36 AM,
    The personal computer is frequently used as a program source for sound reinforcement systems. Internal sound cards can be pretty good and software wave file players abound. A common question is “Where do I set the output level of my PC for optimum results?” The answer can vary per PC, so here are some steps to help figure it out for yours. I will assume that WAV files are being used, but this applies to any audio file format. Sound… View this story
    Filed in: AVFeatureAVInterconnectNetworkingProcessorSignalSoftwareAudio

  • Thursday, September 08, 2011
    av installation
    Bruce Main 09/08 06:48 AM, 0 Comments
    For many sound hire companies, things will be slowing down soon after a busy summer season. Yes, these are the days that turn sound company owner and manager thoughts to Alternative Revenue Sources (ARS). The contracting/install market is generally one of first potential ARS markets that come to mind. There’s that club downtown that wants to stop renting and buy a system. And one of the churches that use your rental stock and services for the Christian rock festival now… View this story
    Filed in: AVFeaturePollStudy HallAVBusinessEngineerInstallationTechnician

  • Monday, September 05, 2011
    crossover
    John Lenard Burnett 09/05 12:01 PM, 1 Comment
    This article is provided by Lenard Audio.   Read John’s introduction to crossovers here. Loudspeaker systems made up of woofer, mid cone and compression driver/tweeter driven by one amplifier are called passive.  Passive refers to the components (inductor and capacitor) between the amplifier and loudspeakers. These components separate the frequencies so bass goes to the woofer and high frequencies to the tweeter. The capacitor and inductor can be in simple or complex arrangements. Passive crossovers are effective but not accurate,… View this story
    Filed in: AVFeaturePollAVLoudspeakerProcessorAudio

  • Thursday, September 01, 2011
    image
    John Murray 09/01 01:05 PM,
    When last we left off, you had just acquired a 3-D, FFT -based measurement system and were ready to use it to tune a sound system. (Click here to view the previous article.) So let’s get to it! The first thing to do is place the calibrated measurement microphone on a mic stand in the middle of the listening area, turn on all of the system’s loudspeakers and turn up the test signal, just as is done with a real-time… View this story
    Filed in: AVFeaturePollStudy HallAVMeasurementMicrophoneSignalSound ReinforcementSystemAudio