I performed the measurements of the Rogue Audio Pharaoh II with my Audio Precision SYS2722 system.1 As the Rogue’s output stages operate in class-D, all the measurements other than frequency and RIAA responses were taken with Audio Precision’s auxiliary AUX-0025 passive low-pass filter, which reduces the level of noise above 80kHz and eliminates noise above 200kHz. Without the filter, 376mV of ultrasonic noise was present at the loudspeaker terminals, with a center frequency of 428kHz.
Looking first at the line-level inputs, the Rogue Pharaoh II preserved absolute polarity, ie, was noninverting from its loudspeak er output with both balanced and single-ended inputs but inverted polarity from the headphone output. With single-ended input signals, the maximum voltage gain at 1kHz was 37dB from the loudspeaker output
