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Wednesday, July 20, 2011
Bruce Bartlett 07/20/11 09:11 AM, 0 CommentsAs audio professionals, the more we understand what’s under the hood of modern power amplifiers, the better we can make a wise buying decision. What are the main sections or parts of a power amp? Every power amplifier includes a power supply, an input stage, and an output stage. Most amps also have protection mechanisms; some have DSP, and a few have networking capability. Let’s explain each feature… Power Supply Basically, a power amplifier uses the input signal to modulate… View this story
Filed in: AV • Feature • Poll • Slideshow • Study Hall • Training • Amplifier • Analog • AV • Digital • Power • Sound Reinforcement -
Thursday, July 14, 2011
Bruce Bartlett 07/14/11 02:24 PM,A client wants to play folk music in a coffee shop. How much amplifier power is needed? A rock group will be playing in a 2,000-seat concert hall. How many watts will you need to provide? A jazz-fusion group bought some loudspeakers, and want to play them as loud as they can get without blowing them up. Which amplifier should you recommend? Questions such as these arise in any sound system design. To help you specify an optimum amount of… View this story
Filed in: AV • Feature • Poll • Study Hall • Amplifier • AV • Audio • Loudspeaker • Power • Sound Reinforcement -
Sunday, June 19, 2011
PSW Staff 06/19/11 11:28 AM, 0 CommentsSurgeX has announced a partnership with Certified Cyber Solutions. Protecting the system and its customers is a main priority for integrators and can become a major issue if not managed properly. This new partnership integrates the SurgeX iControl surge elimination technology and power management with the advanced secure remote management from Certified Cyber Solutions, creating one single solution designed to erase those issues and give the customer the peace of mind that their system is fully protected. The iControl power… View this story
Filed in: AV • Live Sound • Church Sound • News • Poll • Product • AV • Networking • Power • Remote • Signal -
Monday, June 06, 2011
Bill Whitlock 06/06/11 02:41 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 01:42 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 10:23 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 08:13 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 -
Thursday, April 14, 2011
Dave Rat 04/14/11 10:00 AM,Here is a way to increase the actual power delivered to your loudspeakers by 5 percent to 15 percent just by doing a simple wiring change. First, a bit about power amplifiers. Look at the typical power amp as a device that has two reservoirs of energy - one positive, one negative. The audio signal sent to the amp acts as a control to release the energy from the reservoirs to the output. But the problem is that when an… View this story
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Filed in: AV • Feature • Poll • Study Hall • Amplifier • AV • Interconnect • Power • Sound Reinforcement -
Tuesday, April 12, 2011
Pat Brown 04/12/11 10:00 AM, 0 CommentsFew subjects generate more confusion in the audio world than power. There is a very good reason for this - it’s a confusing subject, and one that can easily fool our intuition. Most of us are on a power trip - our attitude is that “more is better.” We want bigger amplifiers and more “powerful” loudspeakers so that our sound systems will be louder. In fact, power ratings are often the main (or only) criteria considered regarding amplifiers and loudspeakers… View this story
Filed in: AV • Feature • Study Hall • Amplifier • AV • Audio • Loudspeaker • Power • Sound Reinforcement • System -
Friday, April 08, 2011
Bill Whitlock 04/08/11 03:41 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
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