performed a complete set of measurements on one of the Rogue DragoNs (serial number DRAM-0551) with my Audio Precision SYS2722 system. As the DragoN has a class-D output stage, I inserted an Audio Precision AUX-0025 passive low-pass filter between the test load and the analyzer. This filter mitigates noise above 80kHz and eliminates noise above 200kHz that would otherwise drive the SYS2722’s input circuitry into slew-rate limiting. Without the filter, there was 408mV of ultrasonic noise with a center frequency
