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New Media Metrics:
The Graphs
DVD-A Stereo track is only 24/44.1 but the rate of change results are not that different to the equivalent SACD, and the power envelope tests the same to within fractions of a dB.
DVD-A Presumably the analog master still exists yet EMI gives us only 48kHz sampling rate on the stereo track, perhaps as a result of bit budget issues. Unremarkable otherwise.
DVD-A Although the stereo track is 24/192 this historic recording delivers nothing above 20kHz other than spuriae that ought not to be there—did anyone at Reprise check with a spectrum analyser?
DVD-A Surprisingly for a 1970s rock recording, there is spectral content above 20kHz, although it tails off fairly rapidly, and the rate of change peaks at around 5kHz.
DVD-A Broadly similar results to the equivalent SACD (see later), notably in the power-envelope test.
DVD-A Clear evidence of music content to above 50kHz, suggesting that Chesky used microphones with unusually wide bandwidth. Challenging power envelope too.
DVD-A Again, music content to over 40kHz, primarily as a result of Luis Conte's tinkling percussion, which also results in the short-lived excursion to 6kHz in the rate-of-change graph.
DVD-A Evidence of spectral content reaching out to 50kHz or so, and the rate-of-change graph relentlessly reaches around 3kHz, peaking at over 6kHz.
SACD Broad peak around 40kHz in the envelope spectrum is odd but the cannon are responsible for some champion rate-of-change spikes.
SACD Much the same results as its DVD-A equivalent, as already noted, but the ultrasonic quantisation noise adds to the rate of change.
SACD Narrow peak at around 55kHz in the envelope- and average spectra is repeated by the Steve Davis and Clark Terry discs, otherwise unexceptional.
SACD Davis' percussion sends the envelope spectrum to beyond 40kHz, but how far beyond is impossible to say because it's swallowed up in SACD's shaped quantisation noise.
SACD Clearly a 48kHz PCM original, so the spectra plummet above 23kHz—not an obvious candidate for SACD release, I'd have to say.
SACD Plenty of spectral content above 20kHz, probably with an occasional excursion above 40kHz but again it's overwhelmed by quantisation noise, as is the rate of change.
SACD Roll-off in the envelope spectra beginning above 20kHz suggests this was recorded with large-capsule studio microphones, so the ultrasonic content isn't all it might have been.
Article Continues: Conclusion »
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