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Just a Little important Fact that many of you may not know
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<blockquote data-quote="jlaine" data-source="post: 95093" data-attributes="member: 542392"><p>I see you don't know enough about amplifier design to even realize that there is a fully independant power supply in the amplifier, and that the rail voltage on the actual internal audio output fets is nothing near 14.4v... With that I don't think I need to go further than this, but I will anyway...</p><p></p><p>The fets voltage rating has no correlation to build quality... None whatsoever. It's matched to the need at hand.</p><p></p><p>//content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif</p><p></p><p>You also realize that by placing 18V to the amplifer power supply, it's output voltage rail will increase by the common percentage of what was gained, until it destroys the fets or itself, often with little, or NO heat at all to be detected. Want a good example? Plug your home amp into 200V instead of 120. This is exactly what you are doing to the car amp when you are placing a constant 18V to it. See how long it lasts for you...</p><p></p><p>The "spikes" you are speaking of are immediately absorbed by the capacitors in the supply chain and the batteries in the vehicle, it never makes it through the vehicles power supply. The most common time for a voltage spike to take place is after a high current draw releases it's load, but only when a constant source voltage is NOT the primary source. (Read: transformer, some sort of inductive load)</p><p></p><p>Starting is NOT the area to find it, because in order for it to create a surge, it has to have a somewhat variant power source, not a DC battery. This would be fine, if you loaded down the alternator, then suddenly released load. Sure, you may spike some, but nothing worth noting. I can place an oscilloscope on a vehicle battery and start the car, and it'll not pull up anything worth noting other than the dip when the battery is discharging. Now if the alternator was supply the charge to start the car, I can see where you are coming from, but it isn't the case.</p><p></p><p>Please go back and do some research, especially in the fields of amplifier topology and vehicle electrical design, include in your reading about TVSS control and what exactly causes a surge, and what doesn't. Be sure to try and find information about spikes in a DC line when controlled by a limited voltage battery.</p><p></p><p>Another problem.</p><p></p><p>105C rated caps will not fail at 105c, that is their operational threshold.</p><p></p><p>What does this have to do with anything? You realize that the heat loss via a capacitor is next to absolutely nothing? The core temperature of the amp and the heatsink is what raises the capacitors operating temperature, not the fact that it is functioning in a circuit. If you pass a lot of current through it, it will begin to warm, but nowhere near the level of what the amp will.</p><p></p><p>Where exactly do you hear all this hogwash from? Deep freezing and overdriving amps to get a voltage reading? Who is telling you these things? I'd love to sit down with them for about a half hour and see how deep this conspiracy theory truly goes...</p></blockquote><p></p>
[QUOTE="jlaine, post: 95093, member: 542392"] I see you don't know enough about amplifier design to even realize that there is a fully independant power supply in the amplifier, and that the rail voltage on the actual internal audio output fets is nothing near 14.4v... With that I don't think I need to go further than this, but I will anyway... The fets voltage rating has no correlation to build quality... None whatsoever. It's matched to the need at hand. [IMG]//content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif[/IMG] You also realize that by placing 18V to the amplifer power supply, it's output voltage rail will increase by the common percentage of what was gained, until it destroys the fets or itself, often with little, or NO heat at all to be detected. Want a good example? Plug your home amp into 200V instead of 120. This is exactly what you are doing to the car amp when you are placing a constant 18V to it. See how long it lasts for you... The "spikes" you are speaking of are immediately absorbed by the capacitors in the supply chain and the batteries in the vehicle, it never makes it through the vehicles power supply. The most common time for a voltage spike to take place is after a high current draw releases it's load, but only when a constant source voltage is NOT the primary source. (Read: transformer, some sort of inductive load) Starting is NOT the area to find it, because in order for it to create a surge, it has to have a somewhat variant power source, not a DC battery. This would be fine, if you loaded down the alternator, then suddenly released load. Sure, you may spike some, but nothing worth noting. I can place an oscilloscope on a vehicle battery and start the car, and it'll not pull up anything worth noting other than the dip when the battery is discharging. Now if the alternator was supply the charge to start the car, I can see where you are coming from, but it isn't the case. Please go back and do some research, especially in the fields of amplifier topology and vehicle electrical design, include in your reading about TVSS control and what exactly causes a surge, and what doesn't. Be sure to try and find information about spikes in a DC line when controlled by a limited voltage battery. Another problem. 105C rated caps will not fail at 105c, that is their operational threshold. What does this have to do with anything? You realize that the heat loss via a capacitor is next to absolutely nothing? The core temperature of the amp and the heatsink is what raises the capacitors operating temperature, not the fact that it is functioning in a circuit. If you pass a lot of current through it, it will begin to warm, but nowhere near the level of what the amp will. Where exactly do you hear all this hogwash from? Deep freezing and overdriving amps to get a voltage reading? Who is telling you these things? I'd love to sit down with them for about a half hour and see how deep this conspiracy theory truly goes... [/QUOTE]
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