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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, January 16, 2012
PSW Staff 01/16/12 07:47 PM,Panamax/Furman has named Joe Manning of International Sales as its new manufacturer’s representative for the Asia-Pacific region. Under the agreement, Manning will help Panamax/Furman expand its presence in the Asia-Pacific market by establishing distribution networks and managing sustained growth for the company’s consumer and pro A/V lines of power and energy management solutions. Manning founded International Sales in 1993 to provide a bridge between U.S. manufacturers and professional distributors and dealers around the world. For the last 18 years, the… View this story
Filed in: AV • Live Sound • Recording • Church Sound • News • Poll • AV • Audio • Business • Manufacturer • Power -
Friday, December 02, 2011
James Cadwallader 12/02/11 02:47 PM,There’s no better feeling than when you’ve setup your system and turned it on to find it lacking any noise. This is no major feat when you have control of the electrical distribution, but when you don’t, things can be a bit more dicey. The classic scenario when the system powers up with a hum is for the operator to declare “ground loop!” followed by muttering and cursing while digging in the accessories box to locate the power cord cheaters. … View this story
Filed in: Church Sound • Feature • Poll • Study Hall • Audio • Installation • Interconnect • Power -
Tuesday, November 22, 2011
Chuck McGregor 11/22/11 01:26 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 -
Thursday, November 17, 2011
Pat Brown 11/17/11 03:51 PM,9V Transmitter For the 9V transmitter I used the Shure SC1-TA. It has a relatively low current drain (50mA) that remains relatively constant with increasing time until the battery voltage is insufficient (6.5V) to keep the unit on. This is a VHF system. AA Transmitter For the AA testing I used the Lectrosonics SM. It is an ultra-miniature digital hybrid UHF transmitter than runs from a single AA cell. The current draw is voltage-dependent. The transmitter turns off when the… View this story
Filed in: AV • Feature • Poll • AV • Audio • Power • Signal • Wireless -
Wednesday, October 19, 2011
Bill Whitlock 10/19/11 10:12 AM, 2 CommentsWhen a system contains two or more pieces of equipment that are grounded, whether via power cords or other ground connections, a “ground loop” will likely be formed. See Figure 1, below. Although ground loops often involve power line safety ground connections, disabling them is both highly dangerous and illegal. However, devices called “ground isolators” can be inserted in the signal path to break the loop safely. This approach attacks the problem at its fundamental roots, while tampering with safety… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Audio • Installation • Interconnect • Power • Signal • Sound Reinforcement • System -
Wednesday, September 21, 2011
Tommy O’Brien 09/21/11 02:57 PM,Among lesser-known amplifier classes – yet viable and employed in pro audio applications - are Class-G and Class-H topologies. Unlike some of the “hybrid” designs touted as “unique” topologies by some in the amplifier development community, these two designs are fairly distinct. That said, there is some disagreement among the amplifier “experts” on the exact definitions of Class-G and Class-H. For purposes of general discussion, when more than one voltage rail is employed, or a pair of rails is used… View this story
Filed in: AV • Feature • Poll • Amplifier • AV • Power • Signal -
Thursday, September 15, 2011
Pat Brown 09/15/11 10:42 AM, 2 CommentsI’ve done enough theorizing and musing about power and power ratings in parts 1 and 2 of this series. (Read part 1 here and part 2 here.) Let’s convert some utility power into audio power. First, some details about the testing. The Source, The Load “Source” and “load” are usually associated with amplifier and loudspeaker. I had to zoom out another level and consider the AC source to the amplifier (these amplifiers need a lot of juice). The amplifier has… View this story
Filed in: AV • Feature • Poll • Product • Amplifier • AV • Interconnect • Measurement • Signal -
Thursday, September 08, 2011
Pat Brown 09/08/11 02:23 PM, 0 CommentsHow 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: Live Sound • Feature • Poll • Amplifier • Power -
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
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