Frank says:

I think (Abbey Road is) the best engineered, best mastered rock and roll album ever produced...except that I take exception to stereo placement. -- From "Frank Zappa talks about Faves, Raves, and composers in their g raves" - some English publication, I think. (2 & 3 from the book, "The Lives and Times of Frank Zappa and the Mothers", some Brit thing again (got it at Blue Meanie Imports in San Diego fifteen years ago.)