The NuPrime Evolution STA offers a breakthrough in distortion reduction. Called Only Distortion Cancellation (ODC) design, it is part of their continual advancement of state-of-the-art Class-D amplifiers over the past decade.
Typical feedback error correction design inverts the output signal for summation with the original input signal to derive the negative error signal, which adds to the next cycle of the input signal to form a more accurate output signal. Nuprime’s ODC Class-D design derives the error signal from the MOSFET devices and the output filter circuit directly, significantly reducing the negative feedback signal, which results in a substantial reduction in distortion, THD+N of 0.002% @1kHz(5W), and less than 0.005% THD+N at 1KHZ (2W-100W). This breakthrough improvement in Class-D design results in a natural and pure sound characteristic.
"The Evolution STA sounds marvellously energetic, expressive, and utterly coherent with immense neutrality but without tipping over into leanness or coolness. The amp is also very linear and quite detailed but not revealing to the point of being analytical, let alone clinical. First and foremost, it paints the complete musical picture while sounding nothing like your typical Class-D amplifier." - Christiaan Punter, HFA
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