User manual SONY ST-RDA1000ES TWP

[. . . ] ES Series Receivers Technical Background Version 3. 0; May 30, 2003 Introduction For 2003, Sony is introducing a completely new and dramatically different line of ES Series audio/video receivers. To create these remarkable components, Sony ES engineers have rethought, refreshed and redesigned just about every aspect: · · · · · Digital power amplifier technology (STR-DA2000ES and higher) Redesigned internal chassis layout (STR-DA2000ES and higher) Pulse power supply (STR-DA2000ES, DA3000ES and DA5000ES) i. LINK® (IEEE 1394) 1-bit digital interface for Super Audio CD (STRDA9000ES) Superior ergonomics with "silver cascade" front panel (STR-DA3000ES and higher) While these design breakthroughs are exciting and fresh, the fact that they make their appearance in the Sony ES Series should come as no surprise at all. From the very beginning, ES receivers have benefited from Sony's comprehensive expertise in digital source components and Sony's thorough understanding of digital signals. Those insights led directly to significant Sony ES innovations: · · · · · · The world's first outboard D/A converter (DAS-702ES, 1985). [. . . ] Treating this crossover distortion is a major goal of conventional amplifier design. +V Pulse Driver LPF Audio Output -V Audio Output The S-Master Pro digital amplifier is immune from these issues because the output transistors do not shape the audio waveform directly. Because the S-Master Pro amplifier uses pulse density, switching glitches get removed from the music by the low pass filter. The system is immune to ES Receivers V3. 0 Page 15 crossover distortion, even when the music or movie sound track is particularly soft. Reduced thermal modulation distortion Analog power amp output transistors create the shape of the audio waveform directly. Unwanted variations in this waveform are heard directly as distortion. Unfortunately, changes in the output signal cause momentary heating or cooling in the transistors. These temperature changes actually alter the performance of the transistor, which distorts the sound. This is thermal modulation distortion. Analog power amplifier. On the left, the waveform can cause complex--and thoroughly unwanted--changes in the temperature and performance of the output transistors. The impact on sound is called thermal modulation distortion. On the right, the transistors perversely generate the most heat at moderate output levels--the levels you're most likely to experience most of the time. At full output, heat generation is near zero. In dramatic contrast, the S-Master Pro amplifier does not generate substantial heat. So thermal effects are minimized at the source. 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). Yet the output transistors generate so little heat that they can be mounted directly onto the S-Master Pro circuit board and cooled by heat sinks less than one inch high! Simple and straight design Heat is always bad for electronics. That's why the heat thrown off by conventional power output transistors is a crucial constraint in amplifier and receiver design. And that's why so many high-power amplifiers require massive internal heat sinks, cooling fans, and chassis layouts that isolate the output transistors at the back or sides. In contrast, the tremendous thermal efficiency of the S-Master Pro amplifier changes everything. Instead of isolating the power output transistors, Sony can place them in the middle of a circuit board. Instead of massive aluminum heat sinks, the SMaster Pro heat sinks can be quite compact, especially on the STR-DA2000ES and DA3000ES. And instead of a complex, circuitous signal flow, driven by the need to hold the output transistors away at the periphery, the S-Master Pro signal flow can be refreshingly simple and straight. ES Receivers V3. 0 Page 17 The internal layout of the STR-DA4ES analog amplifier is driven by the issue of heat dissipation. [. . . ] Recreate the acoustics of the Hollywood dubbing stages where directors go to audition and approve their final sound mixes. 7. 1-channel Virtual Multi Dimension (all models). Recreates the effect of a full array of Surround speakers. ES receivers are destined to be used in custom installations where curtains, screens and lighting "scenes" may require 12-volt triggers. [. . . ]