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Sub/amp wiring for resistance conundrum...
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<blockquote data-quote="mat3833" data-source="post: 8787993" data-attributes="member: 587645"><p>You are correct, the transformer(won't use the "fancy" word even if it's a descriptor and rather important in this case) steps up the voltage to the proper level for the rail caps, it's been a day. The 2 "rails" of mosfets actually "convert" the voltage by switching off and on making the signal. Either way, the example still stands, the transformer doesn't play any real part in the example. </p><p></p><p>I'm confused. How is heat grasping at straws? You do realize that heat is what kills amps most often right? </p><p></p><p>Driving amps too hard and blowing the mosfets - heat buildup caused their resistance to increase, which caused more heat to build up, which caused their resistance to increase, etc until POP! </p><p></p><p>Heat and moisture are the biggest issues in electronics. Heat reduces efficiency and/or melts things, and moisture allows things to corrode and either short to ground OR increases resistance and causes a component to blow. </p><p></p><p>Yea, "output power equals input power times efficiency", but you know what kills efficiency? HEAT! Amps run cooler at 4 ohm because they generate less heat because they pull less current! No matter how you look at it a 4 ohm load is eaiser on an amp. Current, aka heat generation, is the limiting factor in virtually all electronics. </p><p></p><p>There is a reason high power amps have big hunks of aluminum and/or fans to move air across those big ******* hunks of aluminum. </p><p></p><p>The same thing goes for the coil on your subwoofer. The coil needs to cool itself in some way or it will melt the epoxy and short out. Why would a coil generate heat? Oh yea, that's right current is flowing through a resistive load! </p><p></p><p>Cmon man, I'm not throwing ******** here. You asked a question, I gave the specific answer. If you want I'll dig up source material and some good-ol physics to prove my statements. Im deliberately keeping things simplified so it can be a general discussion. </p><p></p><p>Matt</p></blockquote><p></p>
[QUOTE="mat3833, post: 8787993, member: 587645"] You are correct, the transformer(won't use the "fancy" word even if it's a descriptor and rather important in this case) steps up the voltage to the proper level for the rail caps, it's been a day. The 2 "rails" of mosfets actually "convert" the voltage by switching off and on making the signal. Either way, the example still stands, the transformer doesn't play any real part in the example. I'm confused. How is heat grasping at straws? You do realize that heat is what kills amps most often right? Driving amps too hard and blowing the mosfets - heat buildup caused their resistance to increase, which caused more heat to build up, which caused their resistance to increase, etc until POP! Heat and moisture are the biggest issues in electronics. Heat reduces efficiency and/or melts things, and moisture allows things to corrode and either short to ground OR increases resistance and causes a component to blow. Yea, "output power equals input power times efficiency", but you know what kills efficiency? HEAT! Amps run cooler at 4 ohm because they generate less heat because they pull less current! No matter how you look at it a 4 ohm load is eaiser on an amp. Current, aka heat generation, is the limiting factor in virtually all electronics. There is a reason high power amps have big hunks of aluminum and/or fans to move air across those big ******* hunks of aluminum. The same thing goes for the coil on your subwoofer. The coil needs to cool itself in some way or it will melt the epoxy and short out. Why would a coil generate heat? Oh yea, that's right current is flowing through a resistive load! Cmon man, I'm not throwing ******** here. You asked a question, I gave the specific answer. If you want I'll dig up source material and some good-ol physics to prove my statements. Im deliberately keeping things simplified so it can be a general discussion. Matt [/QUOTE]
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Sub/amp wiring for resistance conundrum...
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