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Tuesday, November 06, 2012The Form & Function Of Dynamics Processors
Dennis A. Bohn 11/06 01:28 PM,This article is provided by Rane Corporation. The dynamic range of an audio passage is the ratio of the loudest signal to the quietest signal. For signal processors the magnitude of the power supply voltages restricts the maximum output signal and the noise floor determines the minimum output signal. Professional-grade signal processing equipment can output maximum levels of +26 dBu, with the best noise floors being down around -94 dBu. This gives a dynamic range of 120 dB—an impressive… View this story
Filed in: AV • Feature • Study Hall • Production • Audio • AV • Processor • Signal • Sound Reinforcement -
Thursday, November 01, 2012Emulating What We Hear: Performing & Using The Difference Measurement
Pat Brown 11/01 05:42 PM,Human listeners are effective “comparators.” We are very sensitive to changes in what we hear. When comparing loudspeakers, we are most sensitive to differences between models or brands rather than similarities. This powerful analytical tool can be emulated in the world of test and measurement. I have long considered the “difference” measurement to be one of the most valuable tools available to the sound practitioner. The procedure involves: 1. Performing a measurement 2. Storing it as a reference 3. Introduce… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Loudspeaker • Measurement • Signal -
Wednesday, October 31, 2012Why Should We Care About Power Amplifier Clipping?
Chuck McGregor 10/31 12:22 PM,Clipping means that the tops of the signal are “clipped off” or “flat-topped” when the signal level is exceeding the maximum capability of the power amplifier or some other piece of equipment in the system. During the times when a signal is flat-topped, loudspeaker cones are not being “instructed” to move as it is receiving essentially a DC signal. This means all power goes into heating up their voice coils instead of producing sound. In other words, during the times… View this story
Filed in: AV • Feature • Poll • Study Hall • Amplifier • AV • Power -
Monday, October 22, 2012High Voltage Audio: Unwinding Distribution Transformers
Paul Mathews 10/22 03:26 PM,This article is provided by Rane Corporation. What could be more mundane than the transformers and autoformers that are the backbone of audio distribution systems? This article will show you that there is a lot more going on with these chunks of iron and copper than you ever suspected. Learn why transformers are often the power bottleneck in distribution systems, learn how to interpret datasheets, believe or disbelieve manufacturers’ claims, how to specify HV components, and how to set up… View this story
Filed in: AV • Feature • Blog • Study Hall • Amplifier • AV • Loudspeaker • Power • Signal • Sound Reinforcement -
Friday, October 19, 2012Complete Coverage: Implementing A New System At 80,000-Seat Spartan Stadium
PSW Staff 10/19 02:43 PM,Nearly 80,000 students, alumni and fans pack Spartan Stadium on the campus of Michigan State University for every home football game each fall. MSU has regularly expanded the facility since it was first constructed with just 14,000 seats in 1923, and just in time for kickoff this year, Spartan Stadium underwent a multi-million dollar audio/video systems upgrade. The project includes the Big Ten’s largest video board (occupying 5,412 square feet) behind the sound end zone seating, two auxiliary video boards… View this story
Filed in: AV • Feature • Blog • Amplifier • AV • Installation • Loudspeaker • Networking • Sound Reinforcement -
Tuesday, October 16, 2012It Depends: Deciphering Amplifier Power Ratings
Pat Brown 10/16 05:26 PM,How much power can an audio amplifier produce? As you might expect, “it depends.” I will approach this from two angles - in theory and in practice. This article will deal with the theory. Part 3 will show how things play out in the real world. Importance Of Efficiency Amplifiers don’t make power. They convert it. Any audio power that comes from your amplifier must in turn come from the utility outlet that it is connected to. This is why… View this story
Filed in: AV • Feature • Blog • Product • Study Hall • Amplifier • AV • Power • Sound Reinforcement -
Monday, October 15, 2012Five Tips For Managing Cash Flow In A Commerical Integration Business
Daniel L. Newman 10/15 04:38 PM,This article is provided by Commercial Integrator The integration business can be a fickle place. Factors such as seasonality, dependence on government spending and the way the overall economy can influence spending can present unique challenges for businesses. With the potential for such volatility, commercial integrators are faced with cash flow issues. Most CIs have accounting departments, but cash flow is a different animal. Cash flow is unique because an organization can be generating strong profits but have no… View this story
Filed in: AV • Feature • Blog • AV • Business • Installation • Audio -
Friday, October 12, 2012Voltage Surges: The Real World Of Power Quality Problems
Dennis Ver Mulm 10/12 05:44 PM,Most electronic equipment is designed to operate at voltage levels of 120 volts in North America or 230 volts in Europe. Occasionally some very current hungry equipment might be powered from 208 volts in North America. Regardless of the power line voltage, power supplies inside the electronic equipment convert this AC voltage into much smaller DC voltages that power the integrated circuits and transistors which in turn do the work inside the preamp, mixing console, graphic equalizer or amplifier. Voltage… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Power • Signal • Audio -
Wednesday, October 10, 2012Smooth Performer: Sound Reinforcement For The new eTown Hall
PSW Staff 10/10 05:14 PM,Recognized nationally as a premier radio music program and broadcast on over 300 stations in North America, eTown has recently completed the renovation of its own 17,000-square-foot specialty venue called eTown Hall, located in Boulder, CO. The weekly radio broadcast heard from coast to coast on NPR, public and commercial stations is taped in front of a live audience and features performances and interviews with top musical artists. The format has attracted former presidents and icons including Jane Goodall, Jimmy… View this story
Filed in: AV • Feature • Amplifier • AV • Installation • Line Array • Loudspeaker • Measurement • Sound Reinforcement -
Anatomy Of A System Measurement Rig: Probes, Preamps & Processors
Jamie Anderson 10/10 04:03 PM,Feed The Brain. The primary job of a measurement rig is to acquire electrical and acoustical signals and feed them to the processor so that it can analyze, compare, slice, dice, fold, spindle and mutilate those signals and produce multi-colored charts, graphs and the all-important squiggly lines. “But my software can produce squiggly lines all by itself without all those bothersome wires, preamps and microphones. Isn’t that enough?” Maybe. It depends on whether you are getting paid to pose or… View this story
Filed in: AV • Feature • Study Hall • AV • Digital • Measurement • Microphone • Signal • Software • Sound Reinforcement • System
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