-
Friday, March 11, 2011
Bill Whitlock 03/11/11 04:05 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 -
Friday, March 04, 2011
Bill Whitlock 03/04/11 10:55 AM, 0 Comments“A cable is a source of potential trouble connecting two other sources of potential trouble.” The humor in this statement may be lost on those who regularly assemble sound systems. But a reality of sound systems is that a signal accumulates noise as it flows through equipment and cables. And once noise contaminates a signal, it’s essentially impossible to remove it without altering or degrading the original signal. For this reason, no system can be quieter than its noisiest link.… View this story
Filed in: AV • Feature • Poll • Study Hall • AV • Audio • Digital • Installation • Interconnect • Networking • Power • Signal • Sound Reinforcement • System -
Wednesday, February 09, 2011
Bill Whitlock 02/09/11 12:29 PM, 0 CommentsAfter teaching seminars for more than 15 years now, it still amazes me how many otherwise competent professionals don’t understand the importance of proper equipment safety grounding. Even more shocking (pun intended), many routinely and casually disconnect safety grounds to solve noise problems! Generally speaking, the purpose of grounding is to electrically interconnect conductive objects, such as equipment, in order to minimize voltage differences between them. National Electric Code (NEC) requires that 120-volt AC power distribution in homes and other… View this story
Filed in: AV • Feature • Poll • Study Hall • Amplifier • AV • Audio • Installation • Interconnect • Power • Sound Reinforcement • System
Page 1 of 1 pages
