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Low Earth Orbit
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Heat buildup in sealed boxes
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<blockquote data-quote="John Roberts" data-source="post: 133599" data-attributes="member: 126"><p>Re: Heat buildup in sealed boxes</p><p></p><p>As usual what Peter said....</p><p></p><p>If you do a patent search you find a large number of patents dealing with the process of getting heat out of the box. </p><p></p><p>These techniques vary and include trick drivers that use cone motion to pump hot air out. I am familiar with one patent (a friend of mine got) for speaker ports that bias the direction of air flow kind of like a diode, so that the normal air movement inside a port actually pumps cold air into one port and hot air out of the other. More simple a high and low pair of ports will enjoy some convection flows as warm air escapes out the top port to be replaced by cool air coming into the lower port. </p><p></p><p>The sealed box works against exchanging hot internal air with cooler outside air. Still air is a pretty lousy conductor of heat.</p><p></p><p>For limited duty cycle and time most designs can survive for the time it takes to heat up their thermal mass. For 24x7 design with high power output a sealed box requires some extra consideration IMO. While just like amps, few speakers are 24x7 at full power so any high duty cycle design requires consideration. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 133599, member: 126"] Re: Heat buildup in sealed boxes As usual what Peter said.... If you do a patent search you find a large number of patents dealing with the process of getting heat out of the box. These techniques vary and include trick drivers that use cone motion to pump hot air out. I am familiar with one patent (a friend of mine got) for speaker ports that bias the direction of air flow kind of like a diode, so that the normal air movement inside a port actually pumps cold air into one port and hot air out of the other. More simple a high and low pair of ports will enjoy some convection flows as warm air escapes out the top port to be replaced by cool air coming into the lower port. The sealed box works against exchanging hot internal air with cooler outside air. Still air is a pretty lousy conductor of heat. For limited duty cycle and time most designs can survive for the time it takes to heat up their thermal mass. For 24x7 design with high power output a sealed box requires some extra consideration IMO. While just like amps, few speakers are 24x7 at full power so any high duty cycle design requires consideration. JR [/QUOTE]
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