Yes, I've seen the scope and analyzer traces in the online reviews of the UDP-205. But note that those results are bandwidth limited and/or made at high signal levels. The scope traces in my post are showing oscillation at high frequencies and low amplitudes.
Do artifacts like this affect the sound quality? I don't know. My Oppo is mostly used as a DAC for music listening, and my speakers are very revealing. The system sounds great, but perhaps it might perform a bit better without the HF garbage on the line outputs. When I put a scope on other well-designed audio components, or my own designs, I don't see stuff like this.
Today, I did a bit more investigating, disconnecting the Oppo from all other components, trying different cables, all the input modes. The oscillations appears only on the headphone jack and the left channel stereo RCA connector. The stereo right channel and multi-channel outputs are clean. This makes me think that there is a defect. A marginally unstable op-amp? A flaw in a ground connection or shield that is letting in noise from the switching power supply or digital circuits?
I'll contact Oppo service, and see what they say.
Sony XBR-65A1E, Panasonic TC-P58VT25, Apple TV 4K, Oppo UDP-205, Counterpoint SA-3000, Linn Sondek LP12, Ekos, Aragon 4004 Mk II, Acoustat 3, beer
Last edited by couchfungus; 05-25-2019 at 11:11 AM.