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Amp Tests (1 of 2)
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<blockquote data-quote="Greg Cameron" data-source="post: 31672" data-attributes="member: 42"><p>Re: Amp Tests (2 of 2)</p><p></p><p></p><p> </p><p>Maybe because it's not a true class D amp ;-) I actually wrote to Lab a while back to get clarification of their "class TD" topology, and it was different than what I thought. The actual output stages are, in fact, class AB. The class D section only supplies power to the output devices, a "class D tracking power supply" if you will. IOW, they're using a relatively inexpensive class D circuit design to track the input audio signal and feed only the amount of power to the output devices required to drive the load. The power supply is a SMPS design which powers the class D circuit, which then drives the output circuity. Pretty ingenious really. You can make a very high output amplifier that's very lightweight and not have to give up the sonic benefits of a class AB amp. And the complexity of the class D circuit filter doesn't need to be that great since it's only delivering varying rail power instead of actual audio. I can see why these are popular. But they ain't cheap!</p><p></p><p>Greg</p></blockquote><p></p>
[QUOTE="Greg Cameron, post: 31672, member: 42"] Re: Amp Tests (2 of 2) Maybe because it's not a true class D amp ;-) I actually wrote to Lab a while back to get clarification of their "class TD" topology, and it was different than what I thought. The actual output stages are, in fact, class AB. The class D section only supplies power to the output devices, a "class D tracking power supply" if you will. IOW, they're using a relatively inexpensive class D circuit design to track the input audio signal and feed only the amount of power to the output devices required to drive the load. The power supply is a SMPS design which powers the class D circuit, which then drives the output circuity. Pretty ingenious really. You can make a very high output amplifier that's very lightweight and not have to give up the sonic benefits of a class AB amp. And the complexity of the class D circuit filter doesn't need to be that great since it's only delivering varying rail power instead of actual audio. I can see why these are popular. But they ain't cheap! Greg [/QUOTE]
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