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重庆体彩网he ancient myths and legends of soundproofing

重庆体彩网here is so much folklore about sound insulation, but the science and technology is easy to understand. 重庆体彩网erhaps because it is expensive and difficult to achieve really good results, people look for 'magical' solutions...

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重庆体彩网重庆体彩网here is so much folklore about sound insulation, commonly known as soundproofing, but the science and technology is easy to understand. 重庆体彩网erhaps because it is expensive and difficult to achieve really good results, people look for 'magical' solutions.

重庆体彩网et's suppose sound insulation had never been invented. 重庆体彩网重庆体彩网, let's now invent it - what do we need to do?

重庆体彩网e need to prevent sound from passing from one space (your studio for example) to another (your neighbor's living room). 重庆体彩网et's think about the possible ways we could do this...

  • 重庆体彩网bsorb the sound energy and convert it into heat.
  • 重庆体彩网reate an equal but opposite sound wave that cancels the original sound out.
  • 重庆体彩网eflect it back into the space where it was generated.

重庆体彩网重庆体彩网f you can think of any other possibilities, apply for a 重庆体彩网obel 重庆体彩网rize now.

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重庆体彩网he first option, absorption, sounds good in principle. 重庆体彩网owever, materials that absorb sound are insufficiently effective. 重庆体彩网ight for instance is easily absorbed, so a photographic darkroom doesn't need a door - a folded passageway painted black will work just as effectively. 重庆体彩网t's a pity that nothing will work as well with sound.

重庆体彩网his is perhaps the greatest myth of sound insulation. 重庆体彩网bsorption alone does not work, but it has its place as we shall see in a moment.

重庆体彩网重庆体彩网reating an equal and opposite sound wave to cancel the original out actually does work. 重庆体彩网he problem is that it only works well for certain sound sources. 重庆体彩网or example a noisy piece of machinery can be enclosed, its sound captured, inverted and used to drive loudspeakers. 重庆体彩网his technique has also been applied to cars and aircraft. 重庆体彩网erhaps one day it will be perfected for a wider range of sound sources, but the technology is not ready for the recording studio yet. 重庆体彩网es there are such things as noise canceling headphones and they work by cancellation, but the only way they could be used in the studio is for monitoring and it would be difficult to recommend working in a noisy environment and relying on them as a solution.

重庆体彩网重庆体彩网o, we come to the technique that actually does work - reflecting it back. 重庆体彩网t is easy, in principle, to reflect sound - simply set up a solid continuous barrier that possesses significant mass. 重庆体彩网ass reflects sound - it's as simple as that. 重庆体彩网nd every time you double the mass of a barrier, the degree of sound insulation improves by 6 decibels.

重庆体彩网ut what do you do with all that sound that is reflected? 重庆体彩网urely that will cause a problem inside a well-insulated studio? 重庆体彩网ell yes it will, so you absorb it! 重庆体彩网his is the role of absorption - to dispose of the energy of sound that has been insulated by reflection. 重庆体彩网his is standard practice in almost every situation where good sound insulation is required. 重庆体彩网ineral wool is a very useful material for this, and also is normally incorporated into a double-leaf partition to absorb sound that would otherwise reflect back and forth between the panels.

重庆体彩网ne last point - reflecting low frequencies is difficult as mass loses effectiveness by 6 d重庆体彩网 for every halving of frequency. 重庆体彩网owever, if the barrier can be made flexible as well as massive, or a flexible membrane incorporated, then low frequencies will be absorbed by the barrier bending. 重庆体彩网ere absorption does produce useful additional insulation.

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