LMC
Æresmedlem
Her er et utklipp fra en test av Squeezebox på www.enjoythemusic.com
som forklarer litt om fordelen ved harddiskbasert PC audio:
"If you read my articles on a regular basis, you know I'm a hardcore
analog kinda guy. I love the sound of valves and vinyl but this little
interface device now has me listening to more and more ripped CD's. The
sound of a CD doesn't sound like a CD any more. It's hard to explain,
much yet rationalize (for my pea brain). The only thing that I can
figure is that now on each playback of a CD, no longer do we have all of
the issues associated with a transport mechanism the pick up (optics)
and error correction (and resulting jitter).
Ripping CD's to your hard drive, there are no more read errors on the
fly, no more laser beams reflecting inside the CD players case causing
what ever they cause (think green Sharpie's and blue LED's inside the
case), no more 500 RPM (and less) vibration issues of the transport
shaking the rest of the electronics inside your CD players case, no more
issues of the CD not being perfectly balanced or being slightly out of
round causing read errors. From read errors caused by micro pits and
imperfections on the glass master that are magnified by the
manufacturing process, to additional pits in the plastic formed during
the manufacturing process, all of these contribute to jitter.
When you rip music to your computer, the ripping software utilizes a
second, more intensive level of error correction with the CD/ROM
standard (IEC 10149) which the typical music CD player excludes. This
ripping software differs from music playback software. When you are
making a bit for bit copy of ones and zeros, it is crucial that the copy
be exact. Otherwise, you end up with a corrupt file. The ripping
software and computer looks at the music file as a data file. If a
computer data file is corrupt, it doesn't work, where if a music file is
corrupted while you are playing it, you get a pop, hiss or maybe a
slight reduction in definition. Music playing software (both read and
write) isn't mission critical to a CD player or computer.
Once your CD/ROM drive has extracted all of those little ones and zero's
to your hard drive, you have just eliminated all of the problems
inherent with a transport leaving you with a pure, bit for bit, digital
stream that is then converted to the analog domain (in the form of your
favorite DAC). The end result is you have a more pure, less harsh sound.
If you've ever listened to an extremely expensive CD player ($3,000 to
$5,000), you know that the sound is much more 'analog' than that on a
low to medium priced CD player. Ripping CD's to your hard drive, then
using the Squeezebox, a quality power supply and an external DAC now
gets you much, much closer to the sound of a true high end CD player."
som forklarer litt om fordelen ved harddiskbasert PC audio:
"If you read my articles on a regular basis, you know I'm a hardcore
analog kinda guy. I love the sound of valves and vinyl but this little
interface device now has me listening to more and more ripped CD's. The
sound of a CD doesn't sound like a CD any more. It's hard to explain,
much yet rationalize (for my pea brain). The only thing that I can
figure is that now on each playback of a CD, no longer do we have all of
the issues associated with a transport mechanism the pick up (optics)
and error correction (and resulting jitter).
Ripping CD's to your hard drive, there are no more read errors on the
fly, no more laser beams reflecting inside the CD players case causing
what ever they cause (think green Sharpie's and blue LED's inside the
case), no more 500 RPM (and less) vibration issues of the transport
shaking the rest of the electronics inside your CD players case, no more
issues of the CD not being perfectly balanced or being slightly out of
round causing read errors. From read errors caused by micro pits and
imperfections on the glass master that are magnified by the
manufacturing process, to additional pits in the plastic formed during
the manufacturing process, all of these contribute to jitter.
When you rip music to your computer, the ripping software utilizes a
second, more intensive level of error correction with the CD/ROM
standard (IEC 10149) which the typical music CD player excludes. This
ripping software differs from music playback software. When you are
making a bit for bit copy of ones and zeros, it is crucial that the copy
be exact. Otherwise, you end up with a corrupt file. The ripping
software and computer looks at the music file as a data file. If a
computer data file is corrupt, it doesn't work, where if a music file is
corrupted while you are playing it, you get a pop, hiss or maybe a
slight reduction in definition. Music playing software (both read and
write) isn't mission critical to a CD player or computer.
Once your CD/ROM drive has extracted all of those little ones and zero's
to your hard drive, you have just eliminated all of the problems
inherent with a transport leaving you with a pure, bit for bit, digital
stream that is then converted to the analog domain (in the form of your
favorite DAC). The end result is you have a more pure, less harsh sound.
If you've ever listened to an extremely expensive CD player ($3,000 to
$5,000), you know that the sound is much more 'analog' than that on a
low to medium priced CD player. Ripping CD's to your hard drive, then
using the Squeezebox, a quality power supply and an external DAC now
gets you much, much closer to the sound of a true high end CD player."