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Tuesday, January 24, 2012
PSW Staff 01/24/12 12:23 PM,Switchcraft has introduced the new AudioStix line of adapters, the newest additions to the company’s expanding line of premium pro audio products. AudioStix can be used as stand-alone adapters, rear mounted into modular Switchcraft QGPK Series rack panels, or permanently installed into any number of custom racks and wall plates. Four versions are available now: —#318 Mini AudioStix is an 1/8-inch mini to XLR adapter with volume control and ground lift—#319 is an 1/8-inch mini to terminal block adapter with… View this story
Filed in: AV • Live Sound • Recording • Church Sound • News • Poll • Product • AV • Audio • Interconnect • Power • Signal -
Monday, August 29, 2011
Bill Whitlock 08/29/11 05:36 PM, 0 CommentsThe idea that “dirty” power causes audio system noise problems has a nearly irresistible intuitive appeal - and there are dozens of companies ready to cash in on this widespread but mistaken belief. For example, here is a quote from a well-known manufacturer of power conditioning products: “Today’s residential systems contractors face unprecedented challenges where high resolution, trouble-free operation is required. From inducing AC ground loops, video hum bars, static bursts, damage from AC line surges and variable audio and… View this story
Filed in: AV • Feature • Poll • Analog • AV • Audio • Installation • Interconnect • Measurement • Power • Signal • Sound Reinforcement • System -
Friday, August 12, 2011
Dennis Ver Mulm 08/12/11 12:05 PM, 0 CommentsThe topic of AC power protection has become somewhat one-dimensional for many who regularly work with sound systems, because the concept of a power problem is tied to a specific unpleasant memory of a power disturbance that caused a great deal of grief, and perhaps a small fortune in recovery costs. This explains why some are convinced that power protection is all about guarding against power outages or regulating voltage, while others obsess about power line noise or prevention of… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Audio • Power • Sound Reinforcement • Studio • System -
Tuesday, August 02, 2011
Neil A. Muncy 08/02/11 05:56 PM, 0 CommentsMultiple sources of transient electrical noise (surges) including motors, HVAC equipment, photocopiers, power tools, etc, are present in all modern buildings. Surge energy conveyed by building power systems may also result from external sources such as nearby lightning strikes. To minimize the likelihood of injuries to personnel and damage to equipment due to electrical surges and accidental fault conditions, in North America the National Electrical Code (NEC) specifies that all exposed electrical equipment in building electrical systems is to be… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Audio • Concert • Installation • Interconnect • Power • Signal • Stage • System -
Monday, June 06, 2011
Bill Whitlock 06/06/11 03:41 PM, 0 CommentsA ground loop can exist in any system that contains two or more pieces of grounded equipment, whether via power cords or other ground connections. An isolator is a device that passes signal while interrupting the path for the ground loop current. They are not filters, and must be inserted in the signal path at a specific location, which is found through troubleshooting to be effective. A properly installed isolator virtually eliminates hum, buzz, or other noises caused by ground… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Audio • Installation • Interconnect • Power -
Wednesday, June 01, 2011
Mike Sessler 06/01/11 02:42 PM, 2 CommentsThis article is provided by ChurchTechArts. The topic for today’s post comes from a reader, Jonathan Mould. He wanted to know more about the electrical side of sound. This is an interesting topic because sound is both electrical and physical. Sound systems turn physical movement of air into electrical signals, then process and amplify those signals (sometimes changing them into streams of 1s and 0s and back), and finally turn those amplified signals back into physical air movement. It’s… View this story
Filed in: Church Sound • Feature • Poll • Audio • Power • Signal • System -
Tuesday, May 31, 2011
Garth Powell 05/31/11 11:23 AM, 0 CommentsDo I really need an AC (alternating current) power conditioner or regulator? Isn’t my surge protector enough? Two of the most commonly asked questions regarding power, for sure. Answers, in part, come from an understanding of modern-day realities. AC power is far noisier and contaminated than at any time since its inception. This is due not only to an increased population taxing utility lines, but also because of the proliferation of computers and microprocessors. These devices typically run on switching… View this story
Filed in: AV • Feature • Poll • AV • Audio • Interconnect • Power • System -
Monday, May 16, 2011
Bill Whitlock 05/16/11 09:13 AM, 0 CommentsPreviously (see here and here), we’ve looked at how unbalanced audio interfaces work, as well as how grounding-related noise can actually couple into the signal path. Of course, under fortuitous conditions, audio systems may be acceptably quiet in spite of poor techniques. But physics will ultimately rule and noises may later appear for no apparent reason – remember, noises that disappear by themselves also tend to re-appear by themselves! Most systems consist of more than two pieces of interconnected equipment,… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Audio • Engineer • Installation • Interconnect • Power • Signal • Sound Reinforcement • System -
Friday, April 08, 2011
Bill Whitlock 04/08/11 04:41 PM, 1 CommentElectromagnetic interference, often referred to as EMI, is a degradation of the performance of a piece of equipment or system caused by electromagnetic radiation. Electromagnetic radiation is the travel of alternating electric and magnetic fields through space at 186,273 miles (about a billion feet) per second, or the speed of light. A wavelength, as shown in Figure 1, is the physical distance traveled by a wave during one cycle. A list of frequencies and corresponding wavelengths follows. When the equipment… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Power • Sound Reinforcement -
Friday, March 11, 2011
Bill Whitlock 03/11/11 05:05 PM, 0 CommentsWhile hum and buzz are often blamed on “improper grounding,” actually, this is rarely the case. Properly installed, fully code-compliant AC power distribution systems will develop small, entirely safe voltage differences between the safety grounds of all outlets. These normally insignificant voltages cause problems only when they couple into the signal path at a vulnerable signal interface. Let’s look at why unbalanced interfaces are extremely prone to this coupling and cause noise problems even when no safety ground connections exist.… View this story
Filed in: AV • Feature • Poll • Slideshow • AV • Audio • Installation • Interconnect • Power • Signal • Sound Reinforcement • Studio • System
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