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Junior Varsity
Help me understand system limiting- setting it
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<blockquote data-quote="Frank Koenig" data-source="post: 130475" data-attributes="member: 416"><p>Re: Help me understand system limiting- setting it</p><p></p><p>I believe accurately modeling (or directly measuring) excursion and voice coil temperature is realizable but not a lot of people are doing it (yet). It requires a high level of integration between the driver, enclosure, amplifier, and processor. At this point, for most users and manufacturers, the money spent on fancy processing may better be spent on a more powerful rig that does not need to be run so close to its limits to achieve the required acoustic output. For now, properly applied peak voltage limiting, possibly combined with average power or RMS voltage limiting and a bit of care by the person at the controls does an adequate job.</p><p></p><p>People want different things from limiting. (What problem are we trying to solve?) Personally, I want it to protect the speakers from accidents such as dropped mics, bad phantom power connections, and acoustic feedback events. I also can understand the desire to protect low frequency drivers from prolonged (thermal) overload, but I don't run my hobbyist rig that hard. Many folks seem to view the limiters as a system-wide compressor to be used for artistic effect. I say if you want to crush the whole program, which I generally don't, do it upstream with the right tools.</p><p></p><p>One practical note on setting up limiters: After going through the wild-ass guesses and subsequent math to come up with the settings I often hook up a signal generator and a 'scope (without speakers) to verify that I have the settings I think I do. There are just too many ways to mess it up, especially with a new processor and control program. This needs a little thought and test signal design if separate peak and average limiters are employed. And if the amplifiers sense current as part of their limiting strategy a dummy load must be used for that part.</p><p></p><p>--Frank</p></blockquote><p></p>
[QUOTE="Frank Koenig, post: 130475, member: 416"] Re: Help me understand system limiting- setting it I believe accurately modeling (or directly measuring) excursion and voice coil temperature is realizable but not a lot of people are doing it (yet). It requires a high level of integration between the driver, enclosure, amplifier, and processor. At this point, for most users and manufacturers, the money spent on fancy processing may better be spent on a more powerful rig that does not need to be run so close to its limits to achieve the required acoustic output. For now, properly applied peak voltage limiting, possibly combined with average power or RMS voltage limiting and a bit of care by the person at the controls does an adequate job. People want different things from limiting. (What problem are we trying to solve?) Personally, I want it to protect the speakers from accidents such as dropped mics, bad phantom power connections, and acoustic feedback events. I also can understand the desire to protect low frequency drivers from prolonged (thermal) overload, but I don't run my hobbyist rig that hard. Many folks seem to view the limiters as a system-wide compressor to be used for artistic effect. I say if you want to crush the whole program, which I generally don't, do it upstream with the right tools. One practical note on setting up limiters: After going through the wild-ass guesses and subsequent math to come up with the settings I often hook up a signal generator and a 'scope (without speakers) to verify that I have the settings I think I do. There are just too many ways to mess it up, especially with a new processor and control program. This needs a little thought and test signal design if separate peak and average limiters are employed. And if the amplifiers sense current as part of their limiting strategy a dummy load must be used for that part. --Frank [/QUOTE]
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