Sony str-v555es Manual

ES Receivers v1.0 

 

Page 4 

S-Master Pro amplifier  

with 32-bit DSP 

 
 

The video signal in home theater is increasingly digital from the latest 

digital cinematography in Hollywood through digital transmission channels to 
digital television display panels.  The audio in home theater is increasingly digital 
from the microphone mixing console through the distribution channels, to the 
digital inputs and digital signal processing of your A/V receiver.  With digital 
sources, digital switching and digital preamplification, it was only a matter of time 
until the power amplifier also made the move from analog to digital.   
 
 

Even so, some observers were surprised in 2003 when Sony introduced 

ES Series A/V receivers with a digital amplifier we called S-Master Pro.  Fiercely 
independent critics evaluated the Sony STR-DA9000ES receiver using the finest 
source material and ancillary equipment.  Their response was overwhelming.  
They brought out their highest superlatives, calling the sound of the DA9000ES 
"airy," "delicate," "pure," "relaxed," "open," "fantastic," and "a revelation."   
 
 

Not content with establishing a new benchmark in A/V receiver sound 

quality, the engineers of Sony's ES Series continue to press ahead with an 
upgraded, 32-bit S-Master Pro LSI, redesigned MOS FET transistors and a fresh 
approach to transistor cooling.   
 

First Second 

Third Fourth 

2001 2002 

 2003 2005 

• Clean Data Cycle 

• C-PLM 

• S-TACT 
 

• Clean Data Cycle 

• C-PLM 

• S-TACT 

• Pulse Height 

Volume Control 

 

• Clean Data Cycle 

• C-PLM 

• S-TACT 

• Pulse Height 

Volume Control 

• DC Phase 

Linearizer 

• Discrete Output 

Transistors 

• 32-bit S-Master 

Pro DSP 

• Clean Data Cycle 

• C-PLM 

• S-TACT 

• Pulse Height 

Volume Control 

• Integrated DC 

Phase Linearizer 

• Discrete MOS 

FET Output 
Transistors, 
redesigned 
cooling