Sony STR-DA9000ES - Fm Stereo/fm-am Receiver 기술적 배경 - 페이지 12
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The S-Master Pro circuit reproduces this phase response, with a shift
beginning at 40 Hz.
On the STR-DA2000ES, DA3000ES and DA5000ES, the DC Phase
Linearizer provides four control positions: Off, Standard (factory preset), Mid and
High. The STR-DA9000ES offers seven control positions: Off, Low-A, Standard-
A (factory preset), High-A, Low-B, Standard-B and High-B. In this way, Sony
accommodates the widest range of loudspeaker designs, which may someday
include speakers based on the "flat" phase linearity of digital amplifiers like
Sony's S-Master Pro design.
Sony's DC Phase Linearizer restores the low-frequency phase response
that loudspeaker designers experience when speakers are developed.
In analog amplifiers, the output transistors or ICs directly shape the analog
waveform. For this reason, analog amplifiers are extremely sensitive to the
selection, configuration, bias current and heat sinking of their output devices. By
their design, digital amplifiers are inherently less sensitive to these factors.
That's why some previous digital amplifiers have used relatively inexpensive
integrated circuit op-amps at the output. But Sony ES engineers were after the
best possible sound. So they selected discrete output transistors for the entire
ES line. The STR-DA2000ES, DA3000ES and DA5000ES use low-distortion
Field Effect Transistors (FETs), while the STR-DA9000ES uses deluxe Metal
Oxide Semiconductor FETs (MOS FETs). The result is another measure of
signal integrity.
ES Receivers V3.0
+90
Phase
0°
-90°
DC (0 Hz)
40 Hz
Discrete Output Transistors
Frequency
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