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The Basement
Random punter question of the night
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<blockquote data-quote="Ivan Beaver" data-source="post: 30869" data-attributes="member: 30"><p>Re: Random punter question of the night</p><p></p><p></p><p> </p><p>Exactly. </p><p></p><p>Typically loudspeaker are measured at 1M. How far away is the "probe". MUCH much closer than 1M. If you were to measure the output of most HF drivers or woofers at the same distance as the Ultrasound probe-you would find them a LOT louder than you think. A 120dB loudspeaker (at 1meter) would be over 150dB 1 inch away. But wait-the probe is a lot closer than 1 inch-so at 1/4" you are over 160dB. and so forth.</p><p></p><p>It is NOT the simple single number that you have to "understand"-but rather how it is used and in what context.</p><p></p><p>A number alone does not mean that much-without the parameters to go with it.</p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 30869, member: 30"] Re: Random punter question of the night Exactly. Typically loudspeaker are measured at 1M. How far away is the "probe". MUCH much closer than 1M. If you were to measure the output of most HF drivers or woofers at the same distance as the Ultrasound probe-you would find them a LOT louder than you think. A 120dB loudspeaker (at 1meter) would be over 150dB 1 inch away. But wait-the probe is a lot closer than 1 inch-so at 1/4" you are over 160dB. and so forth. It is NOT the simple single number that you have to "understand"-but rather how it is used and in what context. A number alone does not mean that much-without the parameters to go with it. [/QUOTE]
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