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TheYamaha A-S1000 combines a floating balanced power amp section with a high quality preamp section. Simpler in configuration than the Yamaha A-S2000, it has many of the same sound quality features and delivers excellent performance with the Yamaha CD-S1000 Super Audio CD Player and other high quality components. The power amp, power supply, and phono EQ circuits that contribute to the Yamaha A-S1000's sound quality are identical to those of the Yamaha A-S2000, while the line amp section and volume and tone circuits are nearly the same. Designed to take full advantage of the sonic qualities of the matching CD-S1000, the Yamaha A-S1000 will also bring out the best of other high performance components.
Both the A-S1000 and the Yamaha A-S2000 use a floating balanced configuration to update the power amplifier. This method features identical polarity on the plus and minus side of the output stage. By completely isolating the plus and minus sides of the left and right channels of both the NFB and power supplies, it achieves perfectly symmetrical operation in the output stage. The use of four sets of floating power supply units (not connected to earth), provides further operating precision. The result is very low levels of noise and distortion for transparent sound quality.
Conventional audio amps have the volume and tone control circuits arranged in series (in line); when the tone controls are used, the signal route becomes more complicated, which can lower sound quality. Many high quality amps therefore have a default circuit that can be selected to bypass the tone controls, but this forces you to choose between tone control and optimum quality. The Yamaha A-S2000 and A-S1000 are amplifiers which avoid this problem by employing triple parallel electronic volume and tone controls, providing maximum sound quality even when the tone controls are used (signal goes through fewer ICs, so there is less noise). When the tone controls are set to the centre position, the passive element used for tone control is bypassed, so the three volume elements connected in parallel operate solely to drive and control the volume, for more efficient use of the power output. Each volume element is an ultra-high quality device and an analogue potentiometer is used to provide a very smooth operating feel. Although it is an integrated amplifier, the A-S1000 has a completely left-right symmetrical construction that makes it virtually the equal of separate amps. A central reinforcing bar ensures that the chassis is totally rigid.
