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Articles Tagged Al Keltz

  • Friday, November 14, 2014
    church sound
    Al Keltz 11/14/14 03:55 PM,
    Murphy’s Audio Law #10: “The probability of having sound system failure is inversely proportional to the amount of time remaining until the performance.” We’ve all experienced it—something in our system not working properly or not working at all, and too often, it happens just before the start of a performance. Although the first instinct might be to take a “shotgun” approach and start checking plugs, connections, cables, etc., in a random fashion (i.e., “panic”), a tried-and-true troubleshooting method will almost… View this story
    Filed in: Church SoundFeatureBlogStudy HallAmplifierConsolesLoudspeakerMeasurementMicrophoneSignalSound ReinforcementSystem

  • Tuesday, October 07, 2014
    microphones
    Al Keltz 10/07/14 01:52 PM,
    If a church sound system has evolved along a familiar path, what started out as a pretty simple, small group “sound-on-a-stick” has gradually become more and more sophisticated. Many have replaced that powered mixer with separate components and added a snake to allow for a mix position in the listening area. Words like “direct box,” “balanced,” “low impedance,” “crossover,” etc. have become part of the sound team’s vocabulary as they strive to provide today’s expected level of sound quality and… View this story
    Filed in: Church SoundFeatureBlogStudy HallConsolesInterconnectMicrophoneMixerSignalSound ReinforcementStage

  • Monday, February 24, 2014
    image
    Al Keltz 02/24/14 07:51 AM,
    While they’ve become one of the most popular and recognized multipin connectors in pro audio, the back-story of how MASS connectors came to have such impact shouldn’t be overlooked. Interestingly, MASS connectors weren’t even intended for audio applications; rather, they were originally developed for use in oil exploration. Oil company engineers connected seismographs with miles of cable in areas suspected of containing oil deposits. Explosive charges were then buried along the lines and detonated. The resulting echo “signatures” were captured… View this story
    Filed in: Live SoundFeatureBlogProductStudy HallAnalogConcertInterconnectSignalSound ReinforcementSystem

  • Tuesday, February 05, 2013
    prosoundweb
    Al Keltz 02/05/13 02:49 PM,
    The output from most electronic devices in an audio system will be of low impedance in nature, usually 150 Ohms or less. However, the output from many passive devices, such as a high impedance microphone or passive guitar pickup can have much greater output impedance. What’s the difference and why is it important to know how to deal with these signals in an audio system? Impedance (Z) is the measure of the total opposition to current flow in an alternating… View this story
    Filed in: AVFeatureBlogStudy HallAVInterconnectMeasurementPowerSignalSystem

  • Thursday, January 10, 2013
    image
    Al Keltz 01/10/13 01:01 PM,
    Unbalanced signal lines are characterized by the fact that the cable and connectors use only two conductors, a center conductor surrounded by a shield. Examples of unbalanced wiring are found in tip-sleeve 1/4-inch guitar cords or the cables used with many CD players and tape decks that terminate with RCA phono-type connectors. In an unbalanced configuration, the shield surrounds a single center conductor. (Figure 1, below) The shield stays at a constant ground potential (as it is connected to ground… View this story
    Filed in: Church SoundFeatureBlogStudy HallProductionAudioAnalogDigitalInterconnectPowerSignalSound ReinforcementSystem

  • Thursday, September 13, 2012
    digital audio
    Al Keltz 09/13/12 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

  • Monday, July 02, 2012
    audio
    Al Keltz 07/02/12 12:56 PM,
    Election cycles are getting longer and longer and more campaigns are on the road for extended periods of time while cable and Internet news outlets hunger for content to fill their 24-hour news formats. This has resulted in an increased demand to sound companies and AV rental houses for providing press conference feeds. If you do not have at least one press mult in your inventory, you may be missing out on increased revenue opportunities. At a minimum, you need… View this story
    Filed in: AVFeatureStudy HallAVInterconnectMicrophoneMixer

  • Thursday, April 05, 2012
    image
    Al Keltz 04/05/12 01:42 PM,
    Unbalanced Lines Unbalanced signal lines are characterized by the fact that the cable and connectors use only two conductors, a center conductor surrounded by a shield. Examples of unbalanced wiring are found in tip/sleeve 1/4-in guitar cords or the cables used with many CD players and tape decks which terminate with RCA phono type connectors. In an unbalanced configuration, the shield surrounds a single center conductor. The shield stays at a constant ground potential (as it is connected to ground… View this story
    Filed in: AVFeaturePollStudy HallAVBusinessInstallationInterconnectSignalSound ReinforcementSystemAudio