User manual WHITES ELECTRONICS SEARS 59643

[. . . ] The world's first Dolby® Surround decoder to operate in the digital domain (SDP-505ES, 1986). The world's first all-digital preamplifier (TA-E1000ESD, 1989). 24-bit Dolby Digital® decoding (SDP-EP9ES, 1997). Digital Cinema SoundTM processing (STR-DA90ESG, 1997). [. . . ] The audio signal (B) looks smooth and continuous because the frequencies are low. The noise component (C) looks abrupt and spiky because the frequencies are high. The Low Pass Filter (LPF) effectively separates out the audio signal, for extremely accurate music reproduction. ES Receivers V3. 0 Page 6 Low-Pass Filtering (LPF) (B) audio elements (C) noise elements Frequency The action of the LPF. The audio signal (B) consists of low frequencies, which pass. The red lines show the characteristic of the LPF, which suppresses the noise elements (C) on the right. These are high frequencies, which do not pass. The S-Master Pro process While Sony's S-Master Pro amplifier is simple in principle, the fidelity of the output signal depends on getting each pulse exactly right. That is, the leading and trailing edges of each pulse must have the right timing--and the height of each pulse must be carefully controlled. This is comparable to the requirements for Super Audio CD playback. So to accomplish these goals, Sony used technologies developed for our legendary SCD-1 Super Audio CD player. Sony's own CXD9730 Large Scale Integrated circuit (LSI) provides the S-Master Pro processing. The S-Master Pro process converts the incoming signal to a one-bit Complementary Pulse Length Modulation (C-PLM) stream, after which the Pulse Height Volume control sets the volume level. The S-Master Pro process is performed by the Sony CXD9730, a proprietary Sony Large Scale Integrated circuit (LSI). ES Receivers V3. 0 Page 7 As a primary manufacturer of Large Scale Integrated circuits (LSIs), Sony has the freedom to pursue innovative thinking like S-Master Pro and then express this thinking in silicon. The result is the Sony CXD9730. The S-Master Pro system involves eight important technologies: · · · · · · · · Clean Data Cycle Synchronous Time Accuracy Controller (S-TACT) Complementary Pulse Length Modulation (C-PLM) Pulse Height Volume Control DC Phase Linearizer Discrete Output Transistors Toroidal Low Pass Filter Two-Stage Pulse Power Supply Clean Data Cycle While digital signals are inherently resistant to noise and distortion, they are susceptible to time-base errors called jitter. Because this method does not modify or reshape the original digital samples, there's no loss of information, no loss of detail. The STR-DA9000ES offers seven control positions: Off, Low-A, StandardA (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. Discrete Output Transistors 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 Page 12 The discrete output FETs of the STR-DA2000ES. Toroidal Low Pass Filter The Low Pass Filter is a crucial stage in any digital amplifier. The filter must have a turnover frequency high enough for high-resolution audio, yet have a cutoff characteristic steep enough to suppress high-frequency noise elements. [. . . ] What's more, any small thermal effects that might persist wash out of the signal because digital amplifier output transistors do not "shape" the output waveform in the way that analog output transistors must. With the S-Master Pro amplifier, thermal modulation distortion is no longer a concern. S-Master Pro power amplifier. Here heating is low and the temperatures stay consistent over time. On the right, you can see why digital amplifiers can use much smaller heat sinks. ES Receivers V3. 0 Page 16 The STR-DA2000ES packs 120 watts per channel (20--20, 000 Hz, 8 ohms, 0. 8% THD). [. . . ]