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Why is it so hard to get loud?
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<blockquote data-quote="wickedwitt" data-source="post: 7460191" data-attributes="member: 622908"><p><a href="http://en.wikipedia.org/wiki/Sound_pressure" target="_blank">Sound Pressure Wiki</a></p><p></p><p><a href="http://en.wikipedia.org/wiki/Sound" target="_blank">Sound Wiki</a></p><p></p><p><a href="http://en.wikipedia.org/wiki/Sound_level_meter" target="_blank">Sound Level Meter</a></p><p></p><p>These are not the end all, be all authorities on this subject; but they are a wonderful place to start grasping some solid knowledge on how sound works.</p><p></p><p>EDIT: Almost forgot-</p><p></p><p>Power and loudness in the real world</p><p></p><p>Perceived "loudness" varies logarithmically with output power (other inversely proportionate factors are; frequency, number and material of objects through which the sound waves must travel, as well as distance between source and receiver) a given change in output power produces a much smaller change in perceived loudness. Consequently it is useful and accurate to express perceived loudness in the logarithmic decibel (dB) scale.</p><p></p><p>An increase/decrease of 3 dB corresponds to a doubling/halving of power. The sensitivity of loudspeakers,rather than merely the often-quoted power-handling capacity, is important. Many high quality domestic speakers have a sensitivity of 84 dB for 1 W at 1 meter, but professional speakers can have a figure of 90 dB for 1 W or even 100 dB (especially for some large-coned woofers). I.E., An '84 dB' source "speaker" would require a 400-watt amplifier to produce the same audio energy as a '90 dB' source being driven by a 100-watt amplifier, or a '100 dB' source being driven by a 9.92 watt amplifier. This does not mean a bigger speaker can produce more sound with less overall power. Just that a larger speaker can typically handle more initial power and so requires less amplification to achieve the same high level of output. This means using a speaker with a higher dB rating can be more advantageous as very high power amplifiers become impractical.</p><p></p><p>A better measure of the 'power' of a system is therefore a plot of maximum loudness before clipping of the amplifier and loudspeaker combined, in dB SPL, at the listening position intended, over the audible frequency spectrum. A good system should be capable of generating higher sound levels below 100 Hz before clipping, as the human ear is less sensitive to low frequencies, as indicated by Equal-loudness contours.</p><p></p><p>Taken From- <a href="http://en.wikipedia.org/wiki/Audio_power" target="_blank">Audio Power</a></p><p></p><p>Generic Rules of Thumb- 3db= 2x the power, 3x the output 6db=4x the power, 9x the output and 9db gain= 8x the power, 27x the output. (Of sound level, not your system wattage)</p></blockquote><p></p>
[QUOTE="wickedwitt, post: 7460191, member: 622908"] [URL="http://en.wikipedia.org/wiki/Sound_pressure"]Sound Pressure Wiki[/URL] [URL="http://en.wikipedia.org/wiki/Sound"]Sound Wiki[/URL] [URL="http://en.wikipedia.org/wiki/Sound_level_meter"]Sound Level Meter[/URL] These are not the end all, be all authorities on this subject; but they are a wonderful place to start grasping some solid knowledge on how sound works. EDIT: Almost forgot- Power and loudness in the real world Perceived "loudness" varies logarithmically with output power (other inversely proportionate factors are; frequency, number and material of objects through which the sound waves must travel, as well as distance between source and receiver) a given change in output power produces a much smaller change in perceived loudness. Consequently it is useful and accurate to express perceived loudness in the logarithmic decibel (dB) scale. An increase/decrease of 3 dB corresponds to a doubling/halving of power. The sensitivity of loudspeakers,rather than merely the often-quoted power-handling capacity, is important. Many high quality domestic speakers have a sensitivity of 84 dB for 1 W at 1 meter, but professional speakers can have a figure of 90 dB for 1 W or even 100 dB (especially for some large-coned woofers). I.E., An '84 dB' source "speaker" would require a 400-watt amplifier to produce the same audio energy as a '90 dB' source being driven by a 100-watt amplifier, or a '100 dB' source being driven by a 9.92 watt amplifier. This does not mean a bigger speaker can produce more sound with less overall power. Just that a larger speaker can typically handle more initial power and so requires less amplification to achieve the same high level of output. This means using a speaker with a higher dB rating can be more advantageous as very high power amplifiers become impractical. A better measure of the 'power' of a system is therefore a plot of maximum loudness before clipping of the amplifier and loudspeaker combined, in dB SPL, at the listening position intended, over the audible frequency spectrum. A good system should be capable of generating higher sound levels below 100 Hz before clipping, as the human ear is less sensitive to low frequencies, as indicated by Equal-loudness contours. Taken From- [URL="http://en.wikipedia.org/wiki/Audio_power"]Audio Power[/URL] Generic Rules of Thumb- 3db= 2x the power, 3x the output 6db=4x the power, 9x the output and 9db gain= 8x the power, 27x the output. (Of sound level, not your system wattage) [/QUOTE]
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