Sony STR-DA777ES Technical Background - Page 11
Toroidal Low Pass Filter, MOS FET Output Transistors - parts
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• Built in DC Phase Linearizer. Where Sony's 24-bit LSI required a second chip to contain the DC Phase Linearizer, this circuitry is built right into Sony's 32-bit design. The process is performed by Infinite Impulse Response (IIR) calculation, which processes more data in less time. In this way, Sony has taken the critically-acclaimed S-Master Pro amplifier to a higher level of precision and performance. Those fortunate enough to own of the STR-DA7100ES will experience superb clarity of expression, relaxed listening hour after hour, and the effortless dynamics to handle everything from a the Dies Irae of Verdi's Requiem to the meteor impacts of the latest action movie. 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. In this way, the filter has a major influence on sound quality. That's why the engineers of Sony ES selected the filter parts carefully and methodically. Instead of choosing less expensive cylinder-type coils, the ES engineers chose exotic toroidal coils, optimized for sound. Customers will never see these toroidal coils, but they will hear the benefits in clean, open, non-fatiguing music reproduction. Shown here wrapped in black, the toroidal coils of Sony's Low Pass Filters are more expensive. But their contribution to sound is more than worth the price. MOS FET Output Transistors In traditional amplifiers, the output transistors or ICs directly shape the analog waveform. For this reason, traditional 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 deluxe Metal Oxide ES Receivers v1.0 Page 11