After the disappointing noise floor results of the iFI iPhono I decided to investigate the power supply. Here I compare the incoming mains AC power, the iFI power supply and an alternative 9V PSU, the Boss PSU-120T. Below you’ll see that some of the tests are repeated with different bandwidths so there’s clarity between low and wide bandwidth noise.
iFI iPhono PSU (Red) vs Boss PSU (Blue) Spectrum, 20kHz Bandwidth Limited
iFI iPhono PSU (Red) vs Boss PSU (Blue) Spectrum, 100kHz Bandwidth Limited
iFI iPhono PSU (Red) vs Boss PSU (Blue) Waveform, 100kHz Bandwidth Limited
120V Mains AC Power, Waveform
120V Mains AC Power, Waveform Zoomed