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<blockquote data-quote="genxx" data-source="post: 3371245" data-attributes="member: 575023"><p>Here is some info on top of what <strong>squeak9798</strong> told you to help you understand the classes better.</p><p></p><p>The new ARC KAR amps are class G/H except for the 6 channel which is class A/B.</p><p></p><p>Class G</p><p></p><p>Class G improves efficiency in another way: an ordinary class AB amplifier is driven by a multi-rail power supply. A 500 watt amplifier might have three positive rails and three negative rails. The rail voltages might be 70 volts, 50 volts, and 25 volts. As the output of the amplifier moves close to 25 volts, the supply is switched the 50 volt rail. As the output moves close to the 50 volt rail, the supply is switched to the 70 volt rail. These designs are sometimes called "Rail Switchers". This design improves efficiency by reducing the "wasted" voltage on the output transistors. This voltage is the difference between the positive (red) supply and the audio output (blue). Class G can be as efficient as class D or T. While a class G design is more complex, it is based on a class AB amplifier and can have the same clean characteristics as well.</p><p></p><p>Class H</p><p></p><p>Class H is similar to class G, except the rail voltage is modulated by the input signal. The power supply rail is always just a bit higher than the output signal, keeping the voltage across the transistors small and the output transistors cool. The modulating power supply rail voltage is created by similar circuitry that you would find in a class D amplifier. In terms of complexity, this type of amplifier could be thought of as a class D amplifier driving a class AB amplifier and is therefore fairly complex.</p><p></p><p><a href="http://www.caraudiomag.com/specialfe...wer_amplifier/" target="_blank">http://www.caraudiomag.com/specialfe...wer_amplifier/</a></p><p></p><p>I was going to cut and past but you can just click the link and read.</p><p></p><p><a href="http://en.wikipedia.org/wiki/Electronic_amplifier#Amplifier_classes" target="_blank">http://en.wikipedia.org/wiki/Electronic_amplifier#Amplifier_classes</a></p><p></p><p>99% of class D's currently on the market are great for subs or comps.IMO</p><p></p><p>Alpine PDX and Pioneer's PRS which is based on the Bang and Olufsen's ICEPower which is being used by several manufactures now.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p>You also have class T or Tripath.</p><p></p><p>Most class D amps are 80% to 95% effecient and Class A/B 50% to 65% from what I have seen and understand.//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif</p><p></p><p>The new class D techonolgy has come a long way and has the THD numbers to back it up if you are worried about that issue.//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif</p><p></p><p><strong>5-10% thd no matter how much power u get out of it</strong>//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif</p><p></p><p>If this statement you made is aimed at class D you need to get with the program and put down whatever you are smoking.</p></blockquote><p></p>
[QUOTE="genxx, post: 3371245, member: 575023"] Here is some info on top of what [B]squeak9798[/B] told you to help you understand the classes better. The new ARC KAR amps are class G/H except for the 6 channel which is class A/B. Class G Class G improves efficiency in another way: an ordinary class AB amplifier is driven by a multi-rail power supply. A 500 watt amplifier might have three positive rails and three negative rails. The rail voltages might be 70 volts, 50 volts, and 25 volts. As the output of the amplifier moves close to 25 volts, the supply is switched the 50 volt rail. As the output moves close to the 50 volt rail, the supply is switched to the 70 volt rail. These designs are sometimes called "Rail Switchers". This design improves efficiency by reducing the "wasted" voltage on the output transistors. This voltage is the difference between the positive (red) supply and the audio output (blue). Class G can be as efficient as class D or T. While a class G design is more complex, it is based on a class AB amplifier and can have the same clean characteristics as well. Class H Class H is similar to class G, except the rail voltage is modulated by the input signal. The power supply rail is always just a bit higher than the output signal, keeping the voltage across the transistors small and the output transistors cool. The modulating power supply rail voltage is created by similar circuitry that you would find in a class D amplifier. In terms of complexity, this type of amplifier could be thought of as a class D amplifier driving a class AB amplifier and is therefore fairly complex. [URL="http://www.caraudiomag.com/specialfe...wer_amplifier/"]http://www.caraudiomag.com/specialfe...wer_amplifier/[/URL] I was going to cut and past but you can just click the link and read. [URL="http://en.wikipedia.org/wiki/Electronic_amplifier#Amplifier_classes"]http://en.wikipedia.org/wiki/Electronic_amplifier#Amplifier_classes[/URL] 99% of class D's currently on the market are great for subs or comps.IMO Alpine PDX and Pioneer's PRS which is based on the Bang and Olufsen's ICEPower which is being used by several manufactures now.[IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] You also have class T or Tripath. Most class D amps are 80% to 95% effecient and Class A/B 50% to 65% from what I have seen and understand.[IMG]//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif[/IMG] The new class D techonolgy has come a long way and has the THD numbers to back it up if you are worried about that issue.[IMG]//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif[/IMG] [B]5-10% thd no matter how much power u get out of it[/B][IMG]//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif[/IMG] If this statement you made is aimed at class D you need to get with the program and put down whatever you are smoking. [/QUOTE]
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