Questyle Gold Stack - 2 CMA800R, 1 CMA800P, 1 CAS192D Reference Headphone Separates - DAC, Preamp, Monoblocks

New Lower Price!!! If you are looking at this listing, you probably know what the Questyle Golden Reference Stack is. It may be a set of the best components ever made for personal audio. You are looking at a very rare and extremely high end setup which will blow your mind. Includes the amazing DAC, Preamp, and 2 monoblocks. (See pictures). I have never heard anything like this! I’ve had it for a couple of months and am ready to downsize as I need to pull some cash out of my various systems. Please make me reasonable offers. This is a very rare and unbelievably amazing system.

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From Questyle’s Website:

Questyle Golden Reference System highlights complete separation of audio source, control, left and right channel amplification, even power supply, and each section has pushed the limits of their capabilities, which ensures enough details, dynamic range, clarity and power in any circumstance. The beautiful music and the dark background are so captivating that once you try it, you will not want to stop! The exciting feeling is beyond words.

Questyle Golden Reference System adopts selected aircraft aluminum imported from US, upper and the bottom panels are 5 series aluminum, while front and the rear panels are 6 series. Each panel passed fine machining by CNC device, tolerence under ±0.02mm , volume knob tolerence under ±0.005mm, processed with top level CNC standard. Coat painting materials are imported from Japan. Specially selected screws to fit aluminum precision, tolerence ±0.02mm. Exquisite chassis edge, with elegant edge line, clock calibration volume knob, amber light feeling of LED indicators, all details telling Questyle strict requirement on manufacturing.

Rogers Ceramic PCB

Besides the strict procedure in manufacturing, Questyle Audio Golden Reference System's one more unique point is it's the world's first audio device to use Rogers Ceramic PCBs. Rogers ceramic PCBs, a top level PCB mainly applied in military applications, allow the system to achieve an even more outstanding sound performance and specifications.

Some of the advantage are:
- Ultra-low distortion: 0.00022% (20Hz-20kHz)
- Dielectric constant and dielectric loss are both the lowest available in audio devices
- Ultra-stable dielectric constant in ultra-wide frequency (up to 10GHz) ensures ultra-low loss and stable signal transmission
- Ultra-low thermal expansion , ensures stable operation up to 280 ° C temperature
- Selected components, ceramic packages, provide superior performance in terms of system sound quality and technical specifications

What is Current Mode Amplification ?
Current Mode Amplification is a state-of-the-art technology based on Current Mode. Current Mode Audio Amplifiers use transistors to amplify in fully discrete architectures, with a disaggregate structure designed in, to wit: voltage mode input and output, while the core amplification takes place in the current domain operating in a pure class A state. It is completely different from the traditional voltage mode amplifier, in the structure of the amplification circuit. Capacitance between the transistors, which affect the speed and bandwidth, operate at a very low impedance. It not only eliminates the TIMD, but also easily achieves amplification with a ultra-wide bandwidth (full-power bandwidth of 500kHz ), and ultra-low distortion (0.0002% , challenging the physical limit of audio testing). The Current Mode Amplification technology can be used for amplifiers of any power level (10mW-2000W) and of any size (thousands of square centimeters for some professorial amplifiers).

Quality Control
Each piece of Questyle equipment, before being shipped out, is continuously burned for over 72 hours in high temperature and high voltage and then measured twice by an Audio Precision AP2722 device, to prepare a test report. Every report is unique. Each report has two copies, one is kept at Questyle for reference, while the other goes to user with the product. Questyle uses the test report to track the product and provide service.

- Patented "Current Mode Amplification",
- pure Class A and all discrete components
- High / Low Gain switchable
- Ultra-low THD+N: 0.00022% (20Hz-20kHz)
- Rogers Ceramic printed circuit board for Gold Edition only
- Dimension: 330*300*55mm

- USB input supports True DSD converting
- 3x Clock asynchronous structure
- Support 192KHz / 24Bit
- IIR (MP) digital filter, reducing Jitter to undetectable levels
- Wolfson DAC chipset WM8741
- Balanced (XLR) and unbalanced (RCA) outputs
- Remote control included
- Rogers Ceramic printed circuit board for Gold Edition only
- Dimension: 330*300*55mm

- Patented "Current Mode Amplification", pure Class A and all discrete components
- THD+N: 0.00038% (20Hz-20kHz) in stereo mode;
THD+N: 0.00026% (20Hz-20kHz) in dual mono mode
- Support dual mono full-balanced mode
- Frequency Response: 650kHz; SNR: 118dB
- Rogers Ceramic printed circuit board for Gold Edition only
- Dimension: 330*300*55mm