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Tuesday, October 09, 2012
Bruce Bartlett 10/09/12 12:32 PM,Portable loudspeakers are amazing in their versatility, able to serve as mains, fills, delays, stage monitors and much more, providing solutions for hundreds of applications in live sound reinforcement. These 2-way miracle workers usually include an 8-inch, 12-inch or 15-inch ported woofer and a compression driver on a horn or waveguide, with dispersion (6 dB-down points) commonly at 40 degrees (v) by 90 degrees (h) or 40 degrees (v) by 120 degrees (h). The primary purpose of this dispersion is… View this story
Filed in: AV • Feature • Product • AV • Loudspeaker • Signal • Sound Reinforcement • System • Audio -
Monday, October 08, 2012
Charlie Hughes 10/08/12 03:37 PM,To determine the input impedance of a device, both the voltage across the device and the current flowing into the device must be known. The impedance is simply the voltage across the device E, divided by the current flowing into it, I. This is given by the following equation: It should be understood that since the voltage, E, and the current, I, are complex quantities the impedance, Z, is also complex. That is to say impedance has a magnitude and… View this story
Filed in: AV • Feature • Study Hall • AV • Loudspeaker • Measurement • Signal • Software • Sound Reinforcement • System -
Friday, October 05, 2012
Ken DeLoria 10/05/12 10:46 AM,Be sure to read the other two parts of this series: —Making It Flat: Analyzing Loudspeakers & DSP—Harnessing The Power Of Digital Signal Processing ————————————————- Years ago, a couple of smart guys named Thiele and Small characterized the behavior of cone drivers. One of their many excellent contributions was identifying how an electrical filter (passive or active) can be combined with the electro-mechanical-acoustical parameters of a cone driver, in a properly ported enclosure, to extend and optimize low-frequency output capability. … View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Loudspeaker • Measurement • Processor • Sound Reinforcement -
Thursday, September 27, 2012
Charlie Hughes 09/27/12 08:31 AM,While sound system operators have come to enjoy the considerable benefits of digital signal processing, it’s important to understand how these devices truly interact with loudspeakers. There’s a lot of cause and effect that sometimes gets overlooked, resulting in less than optimum performance, and leaving the operator scratching his head as to what’s going wrong. One particularly important aspect that is often overlooked is using a DSP to drive loudspeakers with a manufacturer’s prescribed settings (or other target drive function).… View this story
Filed in: AV • Feature • Blog • Study Hall • Loudspeaker • Measurement • Processor • Sound Reinforcement -
Tuesday, September 18, 2012
Dave Rat 09/18/12 10:16 AM,I’m asked a lot of questions about sound. Many of them focus on unraveling and understanding some particular function, feature or concept, while others are directed toward distilling my opinion on methods or industry trends. A while ago. I was asked some questions that led me to some in-depth pondering. The questions: Why are line arrays so popular? Are they a fad or here to stay? And what will be the “next big thing”? The fact is that line array-type… View this story
Filed in: Live Sound • Feature • Poll • Concert • Line Array • Loudspeaker • Measurement • Sound Reinforcement • Subwoofer -
Monday, September 17, 2012
PSW Staff 09/17/12 04:01 PM,The Live Sound International Compact Loudspeaker Demo at the upcoming WFX Conference and Expo in Atlanta provides you with the rare opportunity to directly listen to, evaluate, and compare at least a dozen compact loudspeaker systems in a controlled listening environment. The inaugural demo, held last year at WFX in Dallas, exceeded all expectations, drawing more than 700 church sound and production personnel. It presents a unique controlled environment demonstration designed to provide side-by-side listening opportunities for you to evaluate… View this story
Filed in: Live Sound • Church Sound • News • Blog • Product • Business • Education • Line Array • Loudspeaker • Sound Reinforcement -
Friday, September 14, 2012
Pat Brown 09/14/12 04:18 PM,Multiple loudspeakers can be connected in series or parallel to the output of the amplifier. In either case, the current drawn from the amplifier is determined by the total impedance of the load as presented to the loudspeaker terminals. Impedance is the opposition to the flow of current. As the load impedance is decreased, the load on the amplifier is increased, because it must work harder to supply the demand for current. In similar fashion, an automobile trying to maintain… View this story
Filed in: AV • Feature • Study Hall • Amplifier • AV • Installation • Interconnect • Loudspeaker • Power • Sound Reinforcement • Audio -
Tuesday, September 04, 2012
Pat Brown 09/04/12 04:38 PM,Crossover networks are not unique to audio and acoustics. The role of such a network is to produce a transition between two systems of differing capabilities. In a loudspeaker system, an increased overall bandwidth is achieved by splicing together two or more lower bandwidth transducer responses. An individual woofer, squawker and tweeter can form a full-range system through the use of a crossover network. Let’s look at some other systems that require similar transitions between their individual components. Several photographs… View this story
Filed in: AV • Feature • Study Hall • AV • Loudspeaker • Measurement • Processor • Signal -
Monday, August 27, 2012
Chuck McGregor 08/27/12 03:48 PM,The main effect of damping in a loudspeaker is to reduce the SPL produced by the loudspeaker’s diaphragm moving because of its own inertia after the signal stops. The frequency of the sound it produces with this movement will be at the resonant frequency of the moving system. A common term for this is “overhang”. In severe cases this can translate into “one note bass”. Types Of Loudspeaker Damping There are two types of loudspeaker damping: mechanical and electrical. The… View this story
Filed in: AV • Feature • Study Hall • AV • Loudspeaker • Measurement • Sound Reinforcement -
Wednesday, August 22, 2012
Chuck McGregor 08/22/12 03:26 PM,“So how many watts can this loudspeaker take?” The technical answer is that it depends on the thermal and mechanical limits of the drivers and crossover components. The practical answer is that it depends on the program material played: its peak/average ratio or transient content and spectral (frequency) content. The REAL question is not what is the power handling, but what is the OPTIMUM size power amplifier to use on a loudspeaker? Rule of Thumb For a rule of thumb… View this story
Filed in: AV • Feature • Poll • Study Hall • Amplifier • AV • Education • Loudspeaker • Power • Sound Reinforcement
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