The 2 CDs that Nojima has recorded "Nojima Plays List" and "Nojima Plays Ravel" seems to be defective although I can't seem to find anyone reporting this matter anywhere.
I'm not sure if it is the recording, the CD pressing or the particular batch of pressing I purchased recently.
There is a deep rumbling in the background that is pretty irritating and seems to be at it's worst with the later tracks of the Ravel recording. Sounds a bit like traffic noise. The rumbling is mixed with the natural piano resonance sounds and might not be obvious unless your system can play down very low.