"Trevor Wilson"

**If you REALLY want to laugh, look at a 7kHz square wave from a CD player
(even 5kHz is barely passable from most CD players). A good R-R or high
end vinyl playback can do a MUCH better job.


** Square waves output from a CD player (with a suitable test disk) are near
perfect examples of audio band limited square waves. The amplitude and
frequency are steady as a rock, harmonic phase relationships are near
perfect, channel matching is perfect and only inaudible harmonics are
missing.

OTOH, the square wave performance of typical hi-fi R-R and cassette decks is
utterly woeful. Amplitude is modulated all over the place, there is wow and
flutter, channel matching is woeful, there is obvious tape noise, harmonic
phase relationships are all out of wack, there is obvious ringing and still
the inaudible harmonics are missing.

In the cases of both LP and cassette, it is only possible to record a square
wave with low amplitude ( ie -20 dB or so) with any hope of just getting the
available bandwidth.

With CD, it makes no difference - full level ( ie 0dB) square waves are
routine.

TW is bereft of even a single clue.



..... Phil