In the article "CD Disk Data Jitter", we analyzed the problems in the actual use of audio CDs and the reasons
for these problems. Here, We use some low-jitter processed Tai Chi backup CDs to make a sound comparison with LP records to
verify our knowledge of audio CDs.
The judgment of sound comparison is a very personal matter. Which will involve personal
opinions and issues of reference. If we take the sound of CD or LP as references to each other, there may be only one result,
and that is that each has its own strengths. If we look for a reference other than the sound to be compared, we can avoid
the above situation.
When listening to music on the spot, people rarely use some terms that we usually use to evaluate
the sound effects of audio equipment to call into question the live sound. This is because live sound has been regarded as
a true standard by people. Various sound effects terms, they basically just pointed out some deficiencies relative to this
standard. We believe that using real sounds with common perceptions as references will have more objective results.
Listen to music on the spot. The sound there includes some musical instrument
sounds that reach the listener directly, as well as ambient sounds composed of reflected sounds refracted in all directions.
The ambient sound set off the sound of the instrument, which brings out melodious music.
In live music performance,
the end of a note does not mean the end of its sound. The sound of this note will continue to be refracted in the concert
hall and gradually weakened until the next note appears and intersects with it. The sound of music will not be interrupted
by the end of a note. This is a natural physical phenomenon in which sound exists in a limited space. People will remember
the experience of this music performance and use it for sound comparison in the future.
People recognize sounds that
combine the following two aspects:
1 ) Sound State——The emotional state of the sound. Technical expression:
The sound pressure amplitude of sound will change over time. The relationship is expressed on the coordinates of a vertical
axis of amplitude and a horizontal time axis, which will produce a trajectory of the change of the sound pressure value with
time. Sound state----The shape state of the sound pressure value changes trajectory with time.
2 ) The frequency
components that make up the sound. It reflects the timbre of the sound.
In combination with music, the first aspect
can identify which instrument sound (the type of sounding body) is, and the second aspect can identify Which instrument's
sound of the same type of instrument is (different personalities in the same category).
There is a certain gap between LP and CD in terms of technical specifications, and there must be some differences in timbre.
Therefore, for the comparison here, we use the first aspect as the main consideration.
The sound state characteristics
of the sound produced by each object are related to its physical structure. A specific structure has a sound state characteristic
related to this structure. Each sound state feature has a different shape on the sound pressure value/time coordinate graph,
which shows that there will be different instantaneous values at different time points. For each sound (even a single tone
in a very short time), the process of its sound pressure value changing with time, we can break it down into three stages
on the time axis:
The initial stage – Every sound will go through a transition period from weak to
strong before it reaches the maximum sound pressure. As far as human perception is concerned, the length of time at this stage
will be reflected as the speed of sound
Strong sound stage – The period during which the
sound reaches high sound pressure and is maintained. As far as human perception is concerned, the duration of this stage will
be reflected as the intensity of the sound.
Ending stage – The decay process after strong
sound pressure, combined with the reflected sound to form the final stage of the sound. As far as human perception is concerned,
this stage can be experienced as the continuity of sound.
Linn Sondek LP12 turntable
Ekos Mark II tonearm
Transfiguration Temper Superme cartridge
Sony CDP R1 CD Transport
DAS R1 D/A Converter.
Audio Technology SL1 Signature Preamplifier
2 x VTL Deluxe 300MB power amplifier
speaker: Alon IV tri-wire.
Power conditioner : Tice power block 2500w
interconnect and speaker wire:
Digital statement aural symphonies
digital cable 0.5m (Transport to D/A Converter).
Kimber silver streak interconnect cable 0.5m (D/A Converter
DH labs silver sonic BL-1 series II interconnect cable 2m (Preamplifier to power amplifier).
Audioquest midnight 2 Hyperlitz speaker cable for MF 6ft.
Audioquest Sterling 2 Hyperlitz speaker cable for LF and
Tsai Chin Old Song
Tai Chi Backup CD（Backed up from UFO Group
UR-8516 April 1986. Made in Japan）
LP: New Workshop NCSSLP0603 180g. Made in Germany
Between segments, LP playback has obvious noise. In addition, in terms of sound
state, it is difficult for us to distinguish the difference between CD and LP. They are consistent in reflecting the speed,
strength, and continuity of the sound state.
They differ in timbre.
- The ending stage is relatively flat.
Chi Backup CD
- Micro dynamic response is relatively dense
We feel that the emotional state of the singer's voice is consistent in this comparison. The realism of the sound
of the instrument is basically the same. In general, they only differ in timbre, which is mainly reflected in the density
If it is not the noise between the two LP songs, it is difficult for us to tell which one is the
LP or CD sound. Because there is only a slight difference in timbre between them, just like two turntables or cartridges with
The difference in timbre is consistent with the difference in technical indicators between CD
and LP. Whether the difference in timbre is also related to the preamp Phono amplifier, we did not do further research. The
preamplifier uses the original electronic tube, the model is National 6922, it is estimated that their use time has exceeded
In this set of comparisons, we did a comparison test of LP Stylus pressure. When
the Stylus pressure is adjusted to 1.7 grams (1.8 grams typical), the LP sound has a characteristic that audio enthusiasts
call digital sound. If the Stylus pressure is further reduced to 1.6 grams, the level of digital sound is even greater than
that of the original CD.
Temper Superme has a more sensitive Stylus pressure reaction. When the Stylus pressure is accurately adjusted to the
factory recommended value (1.8g), LP playback will have a good sound effect. Because the pressure of the stylus changes with
environmental factors, the pressure scale on the tonearm can only be used as a reference. Therefore, no matter which level
of LP turntable you use, it is definitely worth having an accurate pressure gauge.
McBroom & Lincoln, Mayorga Growing Up in Hollywood Town
Tai Chi Backup CD：(Sheffield CD-13
Stereophonic (p)&(c)1980 Made in Japan)
LP：Shefield LAB 13 (p)1980
Art Pepper Meets The Rhythm Section
Tai Chi Backup CD：（VICJ-2098
Stereo Jasrac (p) & (c) 1996 Made in Japan ）
LP：Contemporary Stereo S7532 APJ 010
Keith Jarrett The Koln Concert
Tai Chi Backup CD：( ECM
1064/65 78118-21064-2 (p) 1975 Made in USA )
LP：ECM 1064/65 ST (p) & (c) 1975
Created by Chen
Last revision date: Aug-2019