From the second link;
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The T-Amp uses Tripath's lowest-end chip, the model 2024, which puts out 15 watts of power and costs $3; its most powerful chip puts out 500 watts, costs $45
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New models are coming out, including one with the same chip as the plastic T-Amp but boasting a metal case and heavy-duty speaker connectors for $139, followed next year by a 50-watt version that will cost $349.
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Having them built in China helps keep the costs low. 
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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