Every testing report is unique and is kept in a safety box at Questyle to aid in following up and maintaining. Skip to main content. Design CMAi, inheriting the state-of-the-art technology of Questyle Golden Reference System, is visually impressive and mysterious for its black and sandblasted chassis, and the amber light of LED indicators.
CMAi can be placed straight with a specially designed stand, which is not only space saving but also eye-catching for its statue-like structure under light Lasered dots of volume scale, which is the DNA of Questyle product family, show the accuracy and specialty of operation.
Current Mode Amplifier CMAi is built with four groups of pure Class A Current Mode amplifiers and all discrete circuit, which achieves the ultra-low distortion level of 0. Buy Questyle Find your nearest Questyle retailer by city, town or post code. Questyle Audio is not the first company to use Current Mode Amplification, several ultra high end amplifier companies such as Halcro and Krell have used Current Mode Transmission in their top model amplifiers and preamplifiers for a while now, and most microwave communication is dependent on Current Mode Amplification as Voltage Mode Amplification is not capable of sufficient bandwidth, but what is completely unique to Questyle is their application of Current Mode Amplification, completely eliminating the basic issues of Current Mode Amplification.
The primary drawback to Current Mode Amplification is that it requires a fixed impedance load, which makes it entirely inappropriate for use with speakers or headphones which are a dynamic impedance load. To deal with this, Questyle developed a multi-stage amplifier topology. The first stage converts the incoming Voltage Mode signal to Current Mode in Voltage Mode the signal is created by modulating voltage, whereas in Current Mode, current is modulated. The second stage is a fully discrete pure Class A amplifier operating in Current Mode, all signal amplification takes place here Gain.
The final stage converts the signal from Current Mode back to Voltage Mode thus making the amplifier compatible with dynamic impedance loads. Questyle Current Mode Amplifiers have a linear bandwidth linear bandwidth refers to the frequency response at all power levels from 0 to full rated power in excess of kHz, and by having the negative feedback loop operate in Current Mode, they produce no Transient Intermodulation Distortion TIMD — that slight harshness and metallic sound associated with solid state amplifiers.
At this point I would like to comment on the deceptiveness of power ratings. Well power is the product of Voltage and Current, essentially Voltage is pressure and Current is flow, and it is the Current that does the heavy lifting, since Current Mode Amplifiers operate in the Current domain, they tend to be Current heavy. To give an analogy that might be easier to understand, in an engine, Horsepower is the product of Torque twisting force and RPM how fast the motor is turning.
As any gear head can tell you, if you have two vehicles with all else being identical, it is the vehicle with more Torque that has the greater pulling power. Back in the world of audio, it is Current that determines how fast a speaker driver starts and stops, which determines how much detail you have and how accurate, especially in the low frequencies, which require much more Current to reproduce.
It also has user accessible gain switches on the bottom for use with IEMs. CMA i. Exceeds All Expectation. Current Mode Amplifier. Full-balanced Amplification. True DSD Processor. Build a PC High-end system.
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