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Junior Varsity
Help me understand system limiting- setting it
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<blockquote data-quote="Nick Hickman" data-source="post: 26577" data-attributes="member: 556"><p>Re: Help me understand system limiting- setting it</p><p></p><p>Hi Bennett,</p><p></p><p>Thanks for the welcome.</p><p></p><p>"If the only tool you have is a hammer ..."? That's fine. What I was shooting at was the idea that excursion follows applied voltage (or current) so that a large peak represents high excursion and can be controlled with a peak limiter. A peak limiter is fine if you need to limit peak power (for example, if you're lucky enough to be able to use the same big amplifiers on every bandpass), but otherwise it's the wrong tool.</p><p></p><p>I don't know how many manufacturers of active boxes are modelling excursion using their built-in DSP, but it sounds like a very good idea that should allow them to extract the maximum performance from the components. Doing excursion modelling in a general-purpose processor is probably out, though doing it in an amplifier (that can readily sense driver current) might be practicable with a minimum of user parameters. Probably too tweaky for most users, though.</p><p></p><p>In most cases, I think the best plan is to use the manufacturer's AES power rating, assuming it's legit. This should (according to AES-2) include the lower frequency limit of the frequency decade that was used for the test. A decent hi-pass filter at or above that limit plus a power (RMS) limiter usually works well.</p><p></p><p>Using a side-chain filter prior to a peak limiter where the filter models the rising excursion with reducing frequency is an interesting idea. I think the scheme could work if fed with sine waves but, if I understand correctly, it can't accurately model excursion for real signals that have multiple frequency components.</p><p></p><p>Anyway, I hope the main thing to take away from this is: signal peak != excursion peak.</p><p></p><p>Nick</p></blockquote><p></p>
[QUOTE="Nick Hickman, post: 26577, member: 556"] Re: Help me understand system limiting- setting it Hi Bennett, Thanks for the welcome. "If the only tool you have is a hammer ..."? That's fine. What I was shooting at was the idea that excursion follows applied voltage (or current) so that a large peak represents high excursion and can be controlled with a peak limiter. A peak limiter is fine if you need to limit peak power (for example, if you're lucky enough to be able to use the same big amplifiers on every bandpass), but otherwise it's the wrong tool. I don't know how many manufacturers of active boxes are modelling excursion using their built-in DSP, but it sounds like a very good idea that should allow them to extract the maximum performance from the components. Doing excursion modelling in a general-purpose processor is probably out, though doing it in an amplifier (that can readily sense driver current) might be practicable with a minimum of user parameters. Probably too tweaky for most users, though. In most cases, I think the best plan is to use the manufacturer's AES power rating, assuming it's legit. This should (according to AES-2) include the lower frequency limit of the frequency decade that was used for the test. A decent hi-pass filter at or above that limit plus a power (RMS) limiter usually works well. Using a side-chain filter prior to a peak limiter where the filter models the rising excursion with reducing frequency is an interesting idea. I think the scheme could work if fed with sine waves but, if I understand correctly, it can't accurately model excursion for real signals that have multiple frequency components. Anyway, I hope the main thing to take away from this is: signal peak != excursion peak. Nick [/QUOTE]
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Help me understand system limiting- setting it
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