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Friday, May 25, 2012
Todd Hartmann 05/25/12 01:20 PM,I’ve spent the past several years experimenting with various types of subwoofer arrays and have arrived at the same conclusion each time: with each method, something is gained while something else is lost. Left-right placement enhances coverage on the sides at the expense of drastic power alleys and cancellation zones. Horizontal arrays produce even coverage in front of the array at the expense of a major drop-off on the sides. With delayed arcing, side coverage is improved, at the expense… View this story
Filed in: Live Sound • Feature • Product • Concert • Loudspeaker • Sound Reinforcement • Subwoofer -
Thursday, May 24, 2012
Ken DeLoria 05/24/12 02:09 PM,There are eight prime factors that determine what we hear from a loudspeaker, each governed by a wide – and interactive - range of electrical and mechanical parameters that come into play. These include the following: —The materials used to construct cones and diaphragms (paper, aluminum, titanium, carbon fiber, composites, etc). —Low-frequency and mid-frequency cone geometry. —The power, linearity, and type of magnetic circuit used in drivers (Alnico, ceramic, neodymium), as well as the voice coil wire (copper, aluminum, round,… View this story
Filed in: Live Sound • Feature • Poll • Study Hall • Line Array • Loudspeaker • Sound Reinforcement • Subwoofer -
Tuesday, May 15, 2012
PSW Staff 05/15/12 09:20 AM,Excerpted from JBL Professional Technical Note Volume 1, Number 14: “Basic Principles for Suspending Loudspeaker Systems.” Design Factor Design factor is a term used by the rigging industry to denote theoretical reserve capability. The rated capacity / of all lifting and hanging equipment b based upon the nominal strength of the equipment reduced by the design factor. Design factor is a number representing the fraction of equipment nominal strength chosen to be appropriate for the particular application. Rated Capacity =… View this story
Filed in: Church Sound • Feature • Poll • Slideshow • Study Hall • Audio • Education • Line Array • Loudspeaker • Sound Reinforcement • Stage • System -
Monday, May 14, 2012
Tom Young 05/14/12 02:03 PM,A well-designed main/primary loudspeaker system is expected to provide clear and intelligible sound to the entire audience. Over the years our industry has benefitted from a steadily growing selection of types and configurations of primary loudspeakers to do this; they possess the specific characteristics (performance and physical) that we need in our base inventory, or for a given project, or to solve a specific problem. Many of these varied types of products are also available over a wide range of… View this story
Filed in: AV • Feature • Poll • AV • Audio • Loudspeaker • Sound Reinforcement • System -
Wednesday, May 02, 2012
Pat Brown 05/02/12 07:02 AM,In my previous article (here), I addressed some of the caveats of measuring sound fields in enclosed spaces. The conclusion was that the eyes and ears do not always agree when it comes to sound quality. If making acoustic measurements is so difficult, why bother? Why not tune the system based solely on listening? Because there are several very good reasons for including our eyes in the system tuning process! We humans base our concept of reality upon the evidence… View this story
Filed in: AV • Feature • Study Hall • AV • Measurement • Signal • Sound Reinforcement -
Friday, April 27, 2012
Bruce Main 04/27/12 11:46 AM,Trap boxes and line arrays get all the attention. And that’s no surprise - they’re big and loud, and dare I say it, glamorous. But the truck rarely rolls without a complement of two-way loudspeakers sporting a 12-inch or 15-inch woofer and a horn. Whether its monitor wedges, drum fill, front fill or just “speakers on sticks,” small 2-way boxes do many of the everyday jobs that make up a typical sound reinforcement day. We take the performance of these… View this story
Filed in: AV • Feature • Poll • AV • Audio • Education • Line Array • Loudspeaker • Measurement • Sound Reinforcement • Subwoofer • System -
Friday, April 06, 2012
Pat Brown 04/06/12 01:22 PM,Two-dimensional graphs are useful for displaying sound system component specifications, but a third dimension is required for considering parameters that are a function of (depend on) a position in space. This includes two data types that are absolutely essential to the sound system designer - loudspeaker directivity data and computer models of auditoriums. Let’s investigate the use of three-dimensional graphs for describing the radiation from loudspeakers. Why is this data needed? Sound radiation is a three-dimensional disturbance that (in most… View this story
Filed in: AV • Feature • Poll • AV • Loudspeaker • Measurement • Sound Reinforcement -
Thursday, March 29, 2012
Brian English 03/29/12 01:48 PM,Many regional sound companies today have made the strategic decision to invest in smaller mid-size line arrays as their main speaker systems of choice (the “A” rig), as oppose to making the huge investment of owning a large-scale “big box” line array system. One of the reasons for this is a smaller box system is much easier to “scale up” for larger events, than it is for a large box system to “scale down” for smaller events. And we all… View this story
Filed in: Live Sound • Feature • Poll • Line Array • Loudspeaker • Measurement • Processor • Sound Reinforcement • Subwoofer -
Saturday, March 17, 2012
Pat Brown 03/17/12 02:27 PM,A loudspeaker array is a collection of loudspeakers that is assembled to achieve a coverage pattern that cannot be achieved with a single device. Arrays are most commonly implemented to achieve a wide horizontal coverage pattern from a position on or above the stage. The “perfect” array would be a collection of loudspeakers whose radiation pattern was indistinguishable from a single (hypothetical) device that provided the needed pattern for the audience area. Many attempts have been made to solve the… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Loudspeaker • Measurement • Sound Reinforcement -
Friday, March 16, 2012
Pat Brown 03/16/12 01:00 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 • Poll • Study Hall • Amplifier • AV • Audio • Installation • Interconnect • Loudspeaker • Power • Sound Reinforcement
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