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Wednesday, May 08, 2013
PSW Staff 05/08/13 05:41 PM,See Part 1, Microphone Cable here and Part 2, Loudspeaker Cable here. Are instrument cables used for high-impedance or low-impedance lines? Generally, the source impedance is the determining factor in cable selection. Instrument cables are used for a wide range of sources. Many keyboard instruments, mixers, and signal processors have very low (50 to 600 ohm) source impedances. On the other hand, typical electric guitar or bass pickups are very inductive, very high impedance (20,000 ohms and above) sources. Typical… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Interconnect • Signal -
Wednesday, April 10, 2013
Dennis A. Bohn 04/10/13 12:22 PM,This article is provided by Rane Corporation. Mainstream digital audio dates from the introduction of the compact disc in the early 1980s. Today two serial interfaces coexist: AES3 (aka AES/EBU) for professional use and S/PDIF for consumer products. Simple low-cost passive conversion between them is possible—even easy—but it is also filled with cautions. The old rule that direct connection between AES/EBU and S/PDIF equipment is bad practice is relaxed today with new receiver chips tolerant to either interface. With… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Digital • Interconnect • Networking • Signal -
Monday, March 04, 2013
Tim Weaver 03/04/13 07:31 PM,The corporate world calls it “workflow,” and in audio, we generally call it “prepping the show” as well as “load in-load out” and “set up-strike.” But none of it is quite adequate in describing effective practices in our overall approach to every show. In running a small sound company in Texas for almost a decade, it occurred to me that there might be a lack of information about how to go about these common yet vital aspects of working in… View this story
Filed in: Live Sound • Feature • Blog • Study Hall • Business • Engineer • Interconnect • Loudspeaker • Sound Reinforcement • Technician -
Tuesday, February 19, 2013
Dan Laveglia 02/19/13 06:10 PM,The idea of setting up a complicated audio system every day, in constantly changing venues and in the time limitations of a few hours is daunting, to say the least. Yet it’s the inevitable reality of touring sound. Thousands of pounds of hardware, miles of cable and hundreds of connections are required for system operation. All of this must be done in a timely manner, to allow for the “black art” of tuning the rig and mixing the music. Multipin… View this story
Filed in: Live Sound • Feature • Blog • Study Hall • Training • Concert • Interconnect • Sound Reinforcement • Stage -
Friday, February 15, 2013
PSW Staff 02/15/13 01:11 PM,What is impedance? Impedance is the AC (alternating current) version of the DC (direct current) term resistance, which is the opposition to electron current flow in a circuit and is expressed in ohms. Impedance (often abbreviated as “Z”) includes capactive reactance and inductive reactance in addition to simple DC resistance. Reactance depends upon the frequency of the signal flowing in the circuit. Capactive reactance increases as frequency decreases: inductive reactance increases as frequency increases. Because of this frequency dependence, impedance… View this story
Filed in: AV • Feature • Blog • Study Hall • Production • Audio • AV • Interconnect • Microphone • Signal -
Thursday, January 10, 2013
Al Keltz 01/10/13 02:01 PM,Unbalanced signal lines are characterized by the fact that the cable and connectors use only two conductors, a center conductor surrounded by a shield. Examples of unbalanced wiring are found in tip-sleeve 1/4-inch guitar cords or the cables used with many CD players and tape decks that terminate with RCA phono-type connectors. In an unbalanced configuration, the shield surrounds a single center conductor. (Figure 1, below) The shield stays at a constant ground potential (as it is connected to ground… View this story
Filed in: Church Sound • Feature • Blog • Study Hall • Production • Audio • Analog • Digital • Interconnect • Power • Signal • Sound Reinforcement • System -
Thursday, January 03, 2013
Pat Brown 01/03/13 07:40 PM,A common task in Audio Land is the need to feed a number of inputs from a single signal source. This may include driving a rack of amplifiers, providing feeds to the press, or distributing a signal around a building or campus. The methods used to accomplish this range from the profoundly simple to quite complex, and the appropriate method must be determined after sizing up the situation. Impedance matching means that an output is terminated with a “mirror” input… View this story
Filed in: AV • Feature • Blog • Study Hall • AV • Interconnect • Power • Signal • System -
Mike Sessler 01/03/13 03:01 PM,This article is provided by ChurchTechArts. So far, we’ve talked about using input sheets to simplify life (here), and drawing from those input sheets to come up with custom cables and snakes that make set up go faster (here). Sometimes you have a bunch of gear that needs to be placed on and removed from the stage every week. In those cases, I like to put it in a rack, box or other enclosure to make it go faster.… View this story
Filed in: Church Sound • Feature • Interconnect • Signal • Stage -
Monday, December 17, 2012
Mike Sessler 12/17/12 06:37 PM,This article is provided by ChurchTechArts. Last time around, I talked about how input lists can make stage set up easier (here). Today, I’ll move out of the office and on to the stage. Optimize Stage Cabling Sometimes, I’m appalled by the cabling I see on church stages. There I said it. I can’t tell you how many times I’ve seen 25- or 50-foot cables running 6 feet, with a giant rat’s nest of a coil either at the… View this story
Filed in: Church Sound • Feature • Blog • Interconnect • Signal • Stage • System -
Thursday, September 06, 2012
Bill Whitlock 09/06/12 05:56 PM,An analog audio interface may be unbalanced or balanced, depending only on the impedances (to ground) of its two signal conductors. In balanced interfaces, both conductors have equal (and non-zero) impedances. A balanced interface also requires that driver, line, and receiver all maintain balanced impedances to ground. They are therefore extremely potent in preventing all kinds of noise coupling, in fact, so powerful that many systems, such as telephone networks, use them instead of shielding as the main noise reduction… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Interconnect • Signal • System • Audio
Articles Tagged Cabling And Interconnect
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