Well, there's a lot here to get into!

1) Artists (just like anyone else) do not have an objective view of
what they sound like - they have a purely subjective mental image and
its comparability to the average view of everybody else is highly
variable - it swings both ways, in that they can sound "worse" or
"better" than the average view. Does this matter? - no, not really. All
that matters is how you personally react to an artist and their music.
Opinions can be polarised - take Bob Dylan or Tom Waits for example!

2) In many cases, a surprising number of people (and things) will have
an effect on the sound you get to hear - only one of which is the
artist!

3) In absolute terms, the recording process will definitely "degrade"
the sound...like anything else to do with audio, it isn't perfect. Is
this important? - NO! Why? Well, if it really was important, we
wouldn't be listening today to the tens of thousands of great
recordings made on equipment that by current standards is a joke...very
limited (and uneven) frequency response, poor THD, lots of noise etc
etc.
This is because we are listening to the music and in older (simpler)
recordings it is easier for the brain to ignore the limitations and
recover the underlying music. As equipment got better so recordings got
more complex - today, arguably, the recording chain is limited by the
microphones - the electronics are probably as good as they need to be.
In other words, if the mics can do a good job of capturing the original
sound, it is possible to preserve this all the way through to your home.
I say possible - but not easy...there's lots that can be done to mess up
the sound on its way from multitrack to CD. 

4) There is nothing magical about tube/valve technology. Yes it is true
that THD is introduced in overload conditions in a way that is more
bearable to the human ear than with solid state stuff (even vs. odd
order harmonics) - however, the idea that tubes can magically introduce
"missing" musical information is just twaddle!. Yes, valves are used as
a creative tool by musicians (and engineers) to add to the musical
experience - indeed, rock, pop, blues and R&B would be very different
without the sound of  tubes distorting. 

However we don't really want to add any more of that even-order
harmonic distortion sound in our replay chain - otherwise we are not
hearing what we should be hearing. It's no different to ambience. Any
guitarist will know that having go a great sound from ones tube amp,
the last thing you want to do is to put sound through another layer of
audible distortion; the result will be unpredictable "mush" as the two
sources of distortion fight against each other. 

5) It is true that "sparkle" can be lost in the recording process
through multiple bounces/overdubs/poor
miking/wiring/compression/etc...and is sometimes "repaired" using
enhancers of variable pedigree/effectiveness (think Aphex Aural
Exciter, SPL Vitaliser, BBE Sonic Maxmiser etc) - however these devices
are all generating fake harmonics derived from the underlying signal and
so are merely "studio effects" - they have nothing to do with "realism"
or "accuracy".

6) In conclusion: yes it's true - even today - that recording bandwidth
is ultimately limited (albeit way less than was possible 20 years ago).
Does it matter? Not really. There are other much more destructive
forces (phase distortion, power delivery or lack thereof, resolution of
detail and micro-dynamics) that mess up the replay experience. And don't
forget...recording bandwidth may be limited, but it is still way higher
than is available from a 16/44.1 replay chain.


-- 
Phil Leigh
------------------------------------------------------------------------
Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85
View this thread: http://forums.slimdevices.com/showthread.php?t=30820

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