steve albini said: I have heard many stories where the quality of one famous song or another is credited to "tape compression." I have heard these stories for many years. I still hear them. Curious what everyone is talking about when they say "tape compression," I have made experiments for myself, where I record music at hotter and hotter levels, to see what this magic is. I used a 1kHz tone to find the point where the tape was actually compressing a 0VU signal by 0.5dB, then 1dB, then 2dB, then 3dB.
Turns out it sounds like ####, if you actually run the tape hot enough to get the effect. We're only talking about a dB, I suppose, but it sounds like ####. Peaks are often 12 to 14dB hotter than average signals, and it sounds like #### well before the 0VU signal is compressing because these transients become rounded and clipped. I've found that an absolute minimum (for me) of headroom before this happens is 12dB. Anything less, and the music sounds dulled and flat. I would encourage you to try your own experiments.
I now believe people use the term (and have always used the term) indescriminately, to describe a good sounding recording.
if digital captures sound exactly like what you put in, why have dvd audio and SACD recently been developed? perhaps its for a more accurate representation of the sound.
(assuming reasonably quality, say CD or above) digital recording colours the sound less than analog, but thats not to say its a pure representation. digital cannot deal with infinite variables when it comes to capturing the signal. the data has to be quantizied to the nearest binary value, this in itself means that the signal is not a true representation. add into this the fact you have (at cd quality) nyquist filters (cutting off the highest harmonics on harmonically rich sound sources such as strings). there are plenty of reasons why digital audio is not as true a representation of the input signal as you imply. im not gonna feel bad if you decide not to reply to this, but im sure ill enjoy it if you do.
on the subject of tape compression (from another forum)
thats good enough evidence for me
and you have an annoying avatar