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Junior Varsity
matching amp with speakers
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<blockquote data-quote="Bennett Prescott" data-source="post: 122311" data-attributes="member: 4"><p>Re: matching amp with speakers</p><p></p><p></p><p></p><p>Hey Avi,</p><p></p><p>If you put in more real power the coil and magnet structure will reach max temp more quickly - and then exceed it. The slope will be more or less the same.</p><p></p><p>We use the 100° limit because it leaves what we consider a safe working margin, as we would like the woofer to survive its rated power indefinitely. The Curie temperature of our neodymium magnets is above 250°C, but they will begin to lose strength around 120°C. The ferrite magnets have a Curie temperature of about 500°C, so not anything we worry about. The bigger problem is the glue used in magnet structure assembly has a working temp around 110°C, so it will begin to soften and change color - convenient as an indicator of abuse. Honestly, none of these are problems we ever see, the increased temperature in some very hot environments has a much greater effect on the voice coil. It is much more likely that the coil will reach its maximum temperature before the magnet structure does, even though that maximum temperature is quite high (>300°C). Our testing is done in a temperature controlled room at about 23°C in order to simulate an outdoor environment.</p><p></p><p>Here is a good guide to magnet temperature, we use temperature grade H magnets: <a href="http://www.supermagnete.de/eng/faq/What-temperatures-can-magnets-sustain" target="_blank">http://www.supermagnete.de/eng/faq/What-temperatures-can-magnets-sustain</a></p><p></p><p>As for "peak power", it doesn't exist. It is sometimes used as a guide to amplifier selection, but for many products there isn't an amplifier available that could provide it anyway. It cannot be used as a guide to excursion as excursion is not easily relatable to input power. At some frequencies it may be possible to overexcurse a woofer at a small fraction of rated power, at others it will accept many times rated power before over excursion (but of course the coil will burn). It is mostly dependent on box design and processing. We only provide a continuous power rating on our spec sheets to aid with amplifier selection, and because everyone else does! In reality all these numbers are just different ways of saying the same power handling with different signal crest factors. A limiter that limits to real RMS power will do so correctly regardless of input signal.</p></blockquote><p></p>
[QUOTE="Bennett Prescott, post: 122311, member: 4"] Re: matching amp with speakers Hey Avi, If you put in more real power the coil and magnet structure will reach max temp more quickly - and then exceed it. The slope will be more or less the same. We use the 100° limit because it leaves what we consider a safe working margin, as we would like the woofer to survive its rated power indefinitely. The Curie temperature of our neodymium magnets is above 250°C, but they will begin to lose strength around 120°C. The ferrite magnets have a Curie temperature of about 500°C, so not anything we worry about. The bigger problem is the glue used in magnet structure assembly has a working temp around 110°C, so it will begin to soften and change color - convenient as an indicator of abuse. Honestly, none of these are problems we ever see, the increased temperature in some very hot environments has a much greater effect on the voice coil. It is much more likely that the coil will reach its maximum temperature before the magnet structure does, even though that maximum temperature is quite high (>300°C). Our testing is done in a temperature controlled room at about 23°C in order to simulate an outdoor environment. Here is a good guide to magnet temperature, we use temperature grade H magnets: [url]http://www.supermagnete.de/eng/faq/What-temperatures-can-magnets-sustain[/url] As for "peak power", it doesn't exist. It is sometimes used as a guide to amplifier selection, but for many products there isn't an amplifier available that could provide it anyway. It cannot be used as a guide to excursion as excursion is not easily relatable to input power. At some frequencies it may be possible to overexcurse a woofer at a small fraction of rated power, at others it will accept many times rated power before over excursion (but of course the coil will burn). It is mostly dependent on box design and processing. We only provide a continuous power rating on our spec sheets to aid with amplifier selection, and because everyone else does! In reality all these numbers are just different ways of saying the same power handling with different signal crest factors. A limiter that limits to real RMS power will do so correctly regardless of input signal. [/QUOTE]
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