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NEW Questyle Audio CMA800R DAC Headphone Amplifier

  1. MoonAudio Contributor

    Hearing your music for the first time

    The "Current Mode Amplification" technology, developed and designed by Questyle Audio CEO and founder Wang Fengshuo, provides the airiness and musicality of a tube amp while maintaining the speed and accuracy of transistors. This technology is subject to a PCT patent.

    In current mode amplification, the signal is amplified by modulating current instead of Voltage. It is widely applied in the high speed communication industry and the video processing industry. However, it is Questyle Audio's patented technology as applied to headphone amplifiers.

    The goals of all high performance amplifiers is low distortion and wide bandwidth. Only with ultra wide bandwidth and high speed processing can an amplifier wonderfully process sudden pulse wave signals, and achieve realistic playback of music signal with speed and transparency.

    In order to achieve this, Questyle Audio abandoned the traditional voltage mode format and developed "Current Mode Amplification." When the component is working in Current Mode, the amplifier Slew Rate (SR) achieves a linear increase as input signal amplitude increases, in direct proportion to the input signal amplitude.

    When receiving a high amplitude signal, a "Current Mode" amplifier's SR is much faster than traditional Voltage mode devices, totally eliminating TIMD and ensuring a high amplitude signal with an extremely wide linear bandwidth and an almost distortion free realistic playback.

    Work Principle

    Questyle Audio's Current Mode Amplifier employs all discrete componentry in a Class A configuration in order to maximize accuracy, current capability, and consistency. To insure maximum compatibility with source units and speakers (headphones), Input and Output both work in voltage mode.

    This diagram shows the input signal travling to the VCCS first; voltage mode is converted to current mode here. It then goes to Ai for amplification (in current mode). Next, it goes to I/V converter to become voltage mode again, and then is output to OPT stage to drive headphones.



    The Questyle Audio CMA800R has a 10mm thick aluminum chassis produced by Foxconn using precise CNC tooling machines.

    The upper cover and bottom chassis "mutual bit" structural design, provides the Questyle Audio CMA800R with stable heat, excellent control of sympathetic vibration and excellent shielding from RFI/EMI radiation.

    Mono Full Balanced Function

    The Questyle Audio CMA800R is the first headphone amplifier to offer Mono Full Balanced output. To create a proper balanced output, a stereo amp is required for each channel. Rather than compromise by using a transformer or resistors, Questyle takes advantage of this by allowing you to switch two Questyle Audio CMA800Rs into "Mono" mode, putting each one into a "Mono Full Balanced" configuration, effectively bridging them in a "Dual Mono" set up.

    The output power is four times that of a single Questyle Audio CMA800R, separately driving the left and right channels, with an ultra-low 0.00038% distortion, and unparalleled channel separation, able to drive high impedance and low sensitivity headphones deeply, improving resolution and dynamics. In this Dual Mono configuration, each channel's power supply and amplification are independent, providing first class driving power, which is especially outstanding in driving difficult to drive headphones or headphones which lack in sound field or separation.

    Thank You.

    Drew Baird
    Moon Audio
    106 Brady Court
    Cary, NC 27511


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  2. Clive101
    Does anyone have experience in a monoblock set up with Chord Dave and Audeze LCD-4 headphones ...?

    I would be interested in the difference between Dave into the LCD-4 direct vs Dave via a monoblock pair either with or without a preamp..?

    Thank you.

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