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Are 90% Of Today's Car Amps The Same
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<blockquote data-quote="MakeshiftAudio" data-source="post: 5912720" data-attributes="member: 608963"><p>I dislike them personally, I havn't dealt too much with such amps like Sundown, but I have used a similar heatsink in a previous project, and it sucked balls like no other compared to the one I replaced it with that had tiny fins on it, pardon my usage but it was quite needed, cost me about $200 in new silicon. I decided to switch when it died twice due to thermal runaway each time. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif The ones that have little (1/16") triangle ridges do better than the solid flat ones I have to admit, but I have to say something that has fins would be far superior to it.</p><p></p><p>I personally would like to see a company use an extruded aluminum sink that used the U channel design, but on the outer bars of the U, have a square about an inch wide by tall even, fill it with about 6-8 thin fins, and have a fan on each side blowing in with a cut in the middle section of the amp that can be squares or slits to act as an exhaust. I used a similar design, but using CPU thin fin heatsinks which I made a small enclosure around the fins to pump water through. It could easily handle about 400W of dissipation from my 5kW motor controller output bridge. (Isotop igbts mounted on each side of the enclosure, which was directly attached to the fins via a hot-cold press fit. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif )</p><p></p><p>The point is, these flat 2 tone heat sinks with minimal fins are more susceptible to heating under a (dissipative) load with no dedicated active cooling, compared to the ones with more fins. I think the designers had in mind things like "Oh, well the fins might get bent if we put them on there." Which can easily happen, even to 1/4" aluminum fins. One of my favorite 1/2 properly heatsinked amps was the xsite xad2k. The only problem with the design is that the heatsinks are aligned to the surface it's being mounted to. I say they should use long heatsinks, with a small fan on the end, or the user could install it. Fans make a world of difference, trust me. Just a simple tiny fan running the same direction of the fins will keep it cool. I could tell another story about this, but I will not, since this is already quite a long post.</p><p></p><p>Final Summation of the post:</p><p></p><p>They are for design.</p><p></p><p>Fins are quite understandably superior by far.</p><p></p><p>Active cooling makes a world of difference.</p><p></p><p>Pardon my little typing errors, since I do not really go back and completely read it, it might contain tiny stupid errors.</p><p></p><p>Edit: Something like adding active cooling to Memphis ST series would make it run extremely cold. I used to have a few problems when running it for hours, didn't shut down due to it, but I decided it was getting far too hot for my liking, installed a 90mm case fan with 1.5" standoffs that arched to the side of the amp, directly into the MDF. That thing ran extremely cool.</p></blockquote><p></p>
[QUOTE="MakeshiftAudio, post: 5912720, member: 608963"] I dislike them personally, I havn't dealt too much with such amps like Sundown, but I have used a similar heatsink in a previous project, and it sucked balls like no other compared to the one I replaced it with that had tiny fins on it, pardon my usage but it was quite needed, cost me about $200 in new silicon. I decided to switch when it died twice due to thermal runaway each time. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] The ones that have little (1/16") triangle ridges do better than the solid flat ones I have to admit, but I have to say something that has fins would be far superior to it. I personally would like to see a company use an extruded aluminum sink that used the U channel design, but on the outer bars of the U, have a square about an inch wide by tall even, fill it with about 6-8 thin fins, and have a fan on each side blowing in with a cut in the middle section of the amp that can be squares or slits to act as an exhaust. I used a similar design, but using CPU thin fin heatsinks which I made a small enclosure around the fins to pump water through. It could easily handle about 400W of dissipation from my 5kW motor controller output bridge. (Isotop igbts mounted on each side of the enclosure, which was directly attached to the fins via a hot-cold press fit. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] ) The point is, these flat 2 tone heat sinks with minimal fins are more susceptible to heating under a (dissipative) load with no dedicated active cooling, compared to the ones with more fins. I think the designers had in mind things like "Oh, well the fins might get bent if we put them on there." Which can easily happen, even to 1/4" aluminum fins. One of my favorite 1/2 properly heatsinked amps was the xsite xad2k. The only problem with the design is that the heatsinks are aligned to the surface it's being mounted to. I say they should use long heatsinks, with a small fan on the end, or the user could install it. Fans make a world of difference, trust me. Just a simple tiny fan running the same direction of the fins will keep it cool. I could tell another story about this, but I will not, since this is already quite a long post. Final Summation of the post: They are for design. Fins are quite understandably superior by far. Active cooling makes a world of difference. Pardon my little typing errors, since I do not really go back and completely read it, it might contain tiny stupid errors. Edit: Something like adding active cooling to Memphis ST series would make it run extremely cold. I used to have a few problems when running it for hours, didn't shut down due to it, but I decided it was getting far too hot for my liking, installed a 90mm case fan with 1.5" standoffs that arched to the side of the amp, directly into the MDF. That thing ran extremely cool. [/QUOTE]
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