Blackness - how quiet does it need to be?


In almost all gear of any substantial value the concept of the blackness, quietness or low noise floor comes up. A reviewer might say that the noise floor was noticably lower when reviewing a particular piece compared to another. Now I get that low noise translates roughly to being able to hear more music and nuanced detail. Thing is, when I turn on my system and no music is going through it, I can't hear anything, unless I put my ear right up to the speaker and the AC isn't running and the fan isn't on, etc. And with music on the only thing I hear is any recorded hiss that might be from the recording. So what I dont get is when they say a piece of equipment sounds quieter, do they mean somehow that the hiss on the recording is lower? I cant see how that would be possible, or are they talking about the hiss of the equipment without muisc? In which case I cant hear it at all when sitting down on my couch. I don't have the world best gear, so I'm thinking are they overplaying the "quiet" card.
last_lemming
Guys,

I'm a long time audiophile and I just wanna say that this has been one of the most informative, easy-to-read threads about "noise" as it pertains to equipment that I've ever read. Kudo's to all and thanks for taking the time

Vance
There's one more thing I'd like to add to this and it's from another thread about believing in magic. It's in the last paragraph before the last line.
http://www.physicsforums.com/archive/index.php/t-122756.html

This lead me to ask if you hear this hiss with all recordings or with just some.
I knew that some recordings have a lot of processing but I never knew that lots of recordings have white noise pumped into them. You could very well be hearing negative artifacts from the recording process as well as the jitter errors mentioned above.

All the best,
Nonoise
It may have been covered to some degree by your discussion in the
context of digital, but to me, i think it goes way beyond hiss- it is the
resolving power of the system to pluck out the nuances of the music or
voice against the background at low levels. The more 'absent' the
background, like ambient noise, the better you can hear all the little things
that are going on in the recording. (rough analogy would be trying to hear a
conversation in a noisy room, compared to quiet space). i think there is a
tendency to
turn up the volume to get more reality, and while that makes it 'louder,' it
doesn't make it more real sounding- in fact, sometimes the opposite
happens; the natural volume of the recorded performance is exceeded and
rather than sounding more lifelike, the system sounds like a sound
reproduction system. So, one 'test' (not really a test in the scientific sense,
but sort of a 'by thumb' way of getting the sense of a system) is how well it
resolves stuff at low volume. Not 'detail' per se, but the nuances, the
shading, the dynamics (differences between loud and soft) at a lower
overall volume level. if a system can do that well, i think it has a low 'noise
floor' in the sense that the music is presented with less ambient junk
around it and
stands out more clearly against the so-called 'black background.'
The point above about the 'natural volume' is a little different, and is just
that there seems to be a db level on playback where the recording just
sounds right, given how it was made, your system, room acoustics, the
type of music, etc. Kinda 'clicks in' just like getting the VTA on a tonearm
has a 'right spot' for a particular record.
And while the recording itself may have nothing to do with the noise floor of
the system, a system with a lower noise floor should be able to benefit
more from a good recording, if the above makes any sense.
my 2 centavos.
"I knew that some recordings have a lot of processing but I never knew that lots of recordings have white noise pumped into them."

The hiss I'm talking about is only on a few select cd recordings of older music. Like my Miles Davis, Kind of Blue HDCD. Most music sounds pretty quiet.
Well, there goes that theory.

I hear an ever so slight hiss or veil (for lack of a better word) on my Kind of Blue CD as well. It's a Columbia/Legacy SBM (Super Bit Mapping) recording.

I've read where Steve Hoffman said that older masters from tape and tube (if they were done that way) don't make the transition to a newly remastered state if done with SS equipment unless certain software is used, correctly. He said it will not sound quite right. Maybe that's it.

All the best,
Nonoise