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60W RMS per channel at 1% THD

We’ve measured the output power of the PiFi-240 amplifier, and it’s capable of a sustained 60W RMS per channel into 4 ohms at <1%THD.  It won’t do this indefinitely without additional heatsinking – the amplifier chips are generating about 6W of heat each at this level of output and the PCB is effectively a 20-25 °C/W heatsink as it stands, which is insufficient to keep the amplifier temperature under the 150°C at which the thermal cutout operates. But it will deliver this amount of power for several seconds (we’ll know more once we’ve taken some detailed thermal measurements) which is way longer than required for music transients.

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