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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Art Welter" data-source="post: 148429" data-attributes="member: 52"><p>Re: 60 Degree DIY Mid Hi</p><p></p><p></p><p>You are right, I misunderstood RMS as it relates to crest factor and wave shape, and was also under the mistaken impression that AES2-1984 "watts" are peak, when they are (or should be..) RMS. I also overlooked that the AES rating is free air for loudspeakers, and based on the minimum impedance, which for a free air speaker will be much lower than the average impedance, making the thermal rating higher than it typically would be in a cabinet. </p><p></p><p>Compression drivers are tested on a device which reasonably simulates the acoustical loading of a horn for the test, so their AES rating should be more indicative of real world use.</p><p></p><p>It is interesting that B&C's power ratings use a "continuous" rating double the RMS, when the speaker has met the AES2-1984 specification the peaks it withstood are four times the RMS rating.</p><p></p><p>BMS, on the other hand, shows the RMS wattage, and then "Peak" four times (or more) the RMS rating.</p><p></p><p>At any rate, as Bennett said "Fuuuuuuuuuck Peak", and use half the AES rating for long term compression.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 148429, member: 52"] Re: 60 Degree DIY Mid Hi You are right, I misunderstood RMS as it relates to crest factor and wave shape, and was also under the mistaken impression that AES2-1984 "watts" are peak, when they are (or should be..) RMS. I also overlooked that the AES rating is free air for loudspeakers, and based on the minimum impedance, which for a free air speaker will be much lower than the average impedance, making the thermal rating higher than it typically would be in a cabinet. Compression drivers are tested on a device which reasonably simulates the acoustical loading of a horn for the test, so their AES rating should be more indicative of real world use. It is interesting that B&C's power ratings use a "continuous" rating double the RMS, when the speaker has met the AES2-1984 specification the peaks it withstood are four times the RMS rating. BMS, on the other hand, shows the RMS wattage, and then "Peak" four times (or more) the RMS rating. At any rate, as Bennett said "Fuuuuuuuuuck Peak", and use half the AES rating for long term compression. Art [/QUOTE]
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60 Degree DIY Mid Hi - AKA PM60
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