Hi zlone (et al)-- to answer your questions:
---my incoming (from the outlet to the P20) distortion tends to be around 2 percent
---outgoing distortion (from P20 to my system components) currently shows. 0.1 percent.
---the incoming sine wave-- looks a bit jagged on the top and bottom (not sure how to read it) with the outgoing sine all the more rounded on top and bottom.
For distortion in general-- I have found the "low distortion" setting perhaps that much more clear for center channel dialogue than the "high distortion" setting.
Any additional thoughts?

