Msr Vs Dimension

Room Acoustics: What Installers Need to Know

“There are so many variables; the listening room and the quality of the components are the main [contributors],” Donnelly explains. “I’ve seen some friends spend a great deal of money on their systems, but the acoustics of their rooms are flawed to the point where no matter how much you spend on a system, you’re not going to get there.” “We have found that a lot of bass ‘traps’ are, in fact, nothing more than absorbers for mid-bass frequencies and they are often ineffective below 100Hz,” he says. “Most home theaters and listening rooms have standing wave resonance problems in the 40Hz to 80Hz region, therefore most of those bass absorbers aren’t going to cure low-frequency issues.” He says homeowners (and installers) considering the addition of acoustical treatments in their homes should seek out products that control room reflections down to 500Hz. This means that absorbers should be at least two inches, but preferably four to six inches, thick. He adds that manufacturers need to back up their claims with test results from reputable independent labs. Also, only a quarter of a room’s walls should be covered with absorbers, Grimani recommends, or the room will be overly damped. (And, by the way, Grimani bemoans the misuse of “dampening” as a term. He notes that dampening is defined as the act of putting water on something, whereas damping is the act of reducing a resonance.) One thing that would help consumers and pros better understand the category, Grimani theorizes, is a redefining of the products used in the field. “For bass traps, I’m going to go out on a limb and say the term means nothing at all, while it means everything too,” he explains. “Most absorbers work through a process of friction of air molecules against fibrous materials.

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The fourth dimension

THE FOURTH DIMENSION CHAPTER I FOUR DIMENSIONAL SPACE There is nothing more indefinite, and at the same time more real, than that which we indicate when we speak of the " higher." In our social life we see it evidenced in a greater ...

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