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<blockquote data-quote="ciaonzo" data-source="post: 8654537" data-attributes="member: 607015"><p>I never valued efficiency, I always went with amplifiers that ran hot because they always sounded better. Early on I didn't even understand why that was so, just that it was. With reading I began to understand that it was the bias in the circuit usually responsible for this. The ability of these amps to pass seemingly endless amounts of current was also a factor in both the heat and good sound. But that's all class D amps are, if you think about it. They are simply current steering devices. Why not keep refining these designs until they are as good or better than class A or a high bias class A/B? That's a no-brainer and I'm glad we're headed there.</p><p></p><p>I think the problem, understandably, is that most don't understand why true class A is a sonic benchmark or why it is so incredibly wasteful and inefficient. True class A runs the highest bias and is basically always running full tilt creating the most heat possible. It also involves zero crossover distortion between different banks of output devices. And most don't run negative feedback circuits. The benefits of this are easily heard, even if it's a marvelous class A/B that has carefully gotten rid of crossover distortion and is running high bias. Even better if is has a low amount of negative feedback, or none at all.</p><p></p><p>*For the visuals below and folks who are unfamiliar - Having zero crossover distortion just means that the banks of transistors are very carefully combined or that a single transistor is handling the entire waveform without chopping it up and handing half of it off to another transistor. But there is always an amount of compromise between crossover distortion and efficiency.</p><p></p><p>To have a class D that can offer a phenomenal slew rate and sound as good as class A, that can also offer an incredibly significant amount of efficiency is a real breakthrough. Even if some of them only end up sounding the same as any old class A/B that was once heralded as a great.</p><p></p><p>[ATTACH]684[/ATTACH]</p><p></p><p>[ATTACH]685[/ATTACH]</p><p></p><p>[ATTACH]686[/ATTACH]</p></blockquote><p></p>
[QUOTE="ciaonzo, post: 8654537, member: 607015"] I never valued efficiency, I always went with amplifiers that ran hot because they always sounded better. Early on I didn't even understand why that was so, just that it was. With reading I began to understand that it was the bias in the circuit usually responsible for this. The ability of these amps to pass seemingly endless amounts of current was also a factor in both the heat and good sound. But that's all class D amps are, if you think about it. They are simply current steering devices. Why not keep refining these designs until they are as good or better than class A or a high bias class A/B? That's a no-brainer and I'm glad we're headed there. I think the problem, understandably, is that most don't understand why true class A is a sonic benchmark or why it is so incredibly wasteful and inefficient. True class A runs the highest bias and is basically always running full tilt creating the most heat possible. It also involves zero crossover distortion between different banks of output devices. And most don't run negative feedback circuits. The benefits of this are easily heard, even if it's a marvelous class A/B that has carefully gotten rid of crossover distortion and is running high bias. Even better if is has a low amount of negative feedback, or none at all. *For the visuals below and folks who are unfamiliar - Having zero crossover distortion just means that the banks of transistors are very carefully combined or that a single transistor is handling the entire waveform without chopping it up and handing half of it off to another transistor. But there is always an amount of compromise between crossover distortion and efficiency. To have a class D that can offer a phenomenal slew rate and sound as good as class A, that can also offer an incredibly significant amount of efficiency is a real breakthrough. Even if some of them only end up sounding the same as any old class A/B that was once heralded as a great. [ATTACH]684._xfImport[/ATTACH] [ATTACH]685._xfImport[/ATTACH] [ATTACH]686._xfImport[/ATTACH] [/QUOTE]
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