Questyle CMA800R a high quality audiophile headphone amplifier, beautifully built both inside and outside and sounds stunning for the money!
Questyle Audio’s outstanding “Current Mode Amplification” technology (subject to a PCT patent held by and the core technology designed and developed 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.
What is Current Mode Amplification?
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, but it is Questyle Audio’s patented technology as applied to headphone amplifiers.
Why We Choose Current Mode Amplification?
Low distortion and wide bandwidth are the goals of all high performance amplifiers. 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.
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.
To maximize accuracy, current capability, and consistency, Questyle Audio’s Current Mode Amplifier employs all discrete componentry, in a Class A configuration. To insure maximum compatibility with source units and speakers (headphones), Input and Output both work in voltage mode. From the diagram we can see, input signal will travel first to VCCS, voltage mode is converted to current mode here, then it 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 headphone
Max Output Power：
180mW (7.5Vrms) @300Ω, standard Stereo Mode
710mW (15Vrms) @300Ω, Mono Mode
SNR： 114 dB, standard Stereo Mode
118 dB, Mono Mode
0.00038%@1kHz, 300Ω standard Stereo Mode
0.00026%@1kHz, 300Ω Mono Mode
Input： XLR stereo, RCA Stereo, and XLR Mono Full Balance input
Output：Dual 6.35mm Stereo headphone Jacks, XLR Mono Full Balance output, RCA Pre-
Work Status：Pure Class A
Power Consumption： 13W
Dimensions： 330*300*55 mm