Actually, I agree that its the whole experience rather than one detail that counts, although I've always purchased on the back of a dealer demo, rather than a home dem, but I went for years not knowing that phone was on the Led Zep track, then heard it played back on a cheap personnal cassette player, through headphones (amazing what headphones can reveal). I got home that evening and played the same song on a Marantz CD63, Arcam Alpha 6+ and NAD 801mms and although I could hear something there, was not able to identify it as a telephone. Ever since then, I've started all auditioning sessions with that song as a test of detail retrieval before moving onto other, more emotional responses with other tracks.