Questyle Audio CMA800i User Manual
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(Global PCT No.: PCT/CN2014/075775)Current Mode Amplification, means the amplification is processed in Currentversion, instead of Voltage version.Current Mode Amplification, same as Voltage mode, also take transistors as ampli-fication components. But the amplification circuit loop is totally different from that involtage mode, in the whole closed-loop all the capacitors in between those transis-tors which affects speed and bandwidth are working under ultra-low impedance, soit can easily achieve large bandwidth and ultra low distortion.Low distortion and large bandwidth is what all amplifiers want to achieve. Only withultra large bandwidth and high speed processing can an amplifier wonderfullyprocess sudden pulse wave signal, and achieve real playback of music signalspeed and transparency.Traditional Voltage mode amplifiers always cause a Transient IntermodulationDistortion (TIMD), which brings a harsh “metallic sound”, badly destroyed thesound.To eliminate TIMD, designers usually adopts feedback circuit loop (lowfeedback, partial feedback or negative feedback) in hardware but these don’t totallysettle the problem, and cost is very high.While Questyle gives up the traditional voltage mode format, designed with a“Current Mode” amplification. When the components is working in Current mode,amplifier Slew Rate (SR) achieves a linear increase as input signal amplitudeincreases, it is in proportion to input signal amplitude. When it’s input with largeamplitude signal, Current Mode amplifier SR is much larger than traditional Voltagemode devices, it can totally eliminate TIMD and ensures large amplitude signal andlow distortion real playback.Current Mode Amplification Technology06 07(China Intellectual Property Office Patent No. 201520211945.X )Unlike other DACs that claim DSD support, yet in actuality provide DoP (DSD overPCM), the Questyle Audio CMA800i accepts the DSD bit-stream directly from yourcomputer, bypassing your computer’s audio processing and digital volume controlas well as the Questyle Audio CMA800i’s digital filters, to provide True DSD, theway it was meant to be heard, without requiring expensive difficult to install propri-etary connectors, or as is the case with DoP breaking up the bit-stream into 16bitpackets and compressing them into a PCM data-stream and then uncompressingthem at the other end, buffering them, then reassembling the bit-stream so that itmay be sent to the DAC as DSD, all of which requires an extreme amount ofprocessing at both the computer end and the DAC end to perform in real timeTrue DSDDirect Stream Digital TechnologyWM8741DSDPCMDSDDACPCMDACDSDPCMTrue DSD DACPCMDSDPCM PCM |
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