Reply to thread

Message

<blockquote data-quote="Art Welter" data-source="post: 148395" data-attributes="member: 52">Re: 60 Degree&nbsp; DIY Mid HiA 1kHz (or any frequency) sine wave has a crest factor of 3dB, twice the average power of the AES compressed and shaped pink noise signal having a 6 dB crest factor. Average power of double the AES rating will burn up a driver, unless the heating raises the impedance high enough so the delivered voltage does not result in too much power, but relying on thermal compression to protect high frequency drivers is pretty &quot;iffy&quot;.A &quot;long term&quot; limiter (which may be &quot;short&quot; in terms of one second) set to the AES &quot;wattage&quot; should be OK as long as the crest factor of the music played is greater than 6 dB, which would be the case for most mid/high musical content, but would be 3 dB too high for safety in the LF portion of many EDM tracks that have 3 dB or less crest factor below 100Hz.Since high frequency acoustical feedback can go as low as 3 dB crest factor (rather quickly...), to be safe I&#039;d still recommend 1/2 the AES for &quot;long term&quot; limiting, and up to double AES for &quot;peak&quot; limiting.The Powersoft tech sheet linked in post #493 has guidelines on page 8 and 9 as to what is &quot;long&quot; in terms of attack/release times for various generic frequency ranges and driver types.</blockquote>

[QUOTE="Art Welter, post: 148395, member: 52"] Re: 60 Degree DIY Mid Hi A 1kHz (or any frequency) sine wave has a crest factor of 3dB, twice the average power of the AES compressed and shaped pink noise signal having a 6 dB crest factor. Average power of double the AES rating will burn up a driver, unless the heating raises the impedance high enough so the delivered voltage does not result in too much power, but relying on thermal compression to protect high frequency drivers is pretty "iffy". A "long term" limiter (which may be "short" in terms of one second) set to the AES "wattage" should be OK as long as the crest factor of the music played is greater than 6 dB, which would be the case for most mid/high musical content, but would be 3 dB too high for safety in the LF portion of many EDM tracks that have 3 dB or less crest factor below 100Hz. Since high frequency acoustical feedback can go as low as 3 dB crest factor (rather quickly...), to be safe I'd still recommend 1/2 the AES for "long term" limiting, and up to double AES for "peak" limiting. The Powersoft tech sheet linked in post #493 has guidelines on page 8 and 9 as to what is "long" in terms of attack/release times for various generic frequency ranges and driver types. [/QUOTE]

Verification