The Questyle CMA400i, inheriting the state-of-the-art technology from the Golden Reference System, is visually impressive, mysterious in its sandblasted black chassis, and amber LED indicators.
The CMA400i can be placed vertically with a specially designed stand, which is not only saving space but also eye-catching due to its statue-like structure.
Lasered dots for the volume scale, show the accuracy and specialty of operation, which is in Questyle's DNA.
The "Function" switch on the front panel switches between "Headphone Amplifier" and "Pre-amplifier". A LED indicator will show you which "Function" is active.
Current Mode Amplifier: The CMA400i has four groups of pure Class A 'Current Mode' amplifiers. All discrete circuit. This achieves an ultra-low distortion level of 0.0006% and ultra-wide bandwidth of up to DC-600kHz (+0,-3dB). The impressive technical performance together with warm and powerful sound makes CMA400i comparable with a high-end headphone amplifier.
Full-balanced Amplification: The CMA400i can drive headphones in full-balanced mode as it features four groups of pure Class A 'Current Mode' amplification circuits, and supports a 4-PIN balanced XLR output, a 2.5mm balanced headphone jack and a 6.35mm standard headphone jack. In addition, the new 'Gain Control' switch on the bottom of the chassis allows the CMA400i to deliver power to different headphones.
True DSD Processor: The CMA400i is designed with Questyle patented True DSD technology and AKM AK4490 DAC chip. It processes DSD signals without any PCM converting and provides True DSD.
The CMA400i's chassis is made of aircraft-grade Aluminium 6063 and manufactured by Foxconn, black and sandblasted chassis, which ensures that the CMA400i remains at a steady 55 degrees whilst being a pure Class A amplifier. Exquisitely finished, with elegant lines, clock calibrated volume knob and amber LED indicators. All detailing Questyle's strict manufacturing requirements.
THD+N: RCA:< 0.0009%; XLR:< 0.0009%
SNR: RCA: >110dB; XLR: >113dB (non-weighting)
USB Type B Input: 44.1K-384K/16-32Bit PCM and DSD native, DSD64 / 128 / 256
Digital Interface: SPDIF input and output, OPT input; Support 44.1K-192K / 24Bit PCM
Gain: 7.8dB ( 2.47, standard ) / 0.83dB ( 1.1, low )
1x 6.35mm standard headphone jack
1x 4-PIN full-balanced headphone jack
1x 2.5mm full-balanced headphone jack
Max Output Power:
106mW@300Ω; 650mW@32Ω (6.35mm headphone jack)
418mW@300Ω; 1200mW@32Ω (balanced headphone jack)
To enhance the reliability of CMA400i, Questyle designed a power-limited circuit used for low impedance, the output power is limited to:
410mW @32Ω（6.35mm headphone jack)
430mW @32Ω（balanced headphone jack)
0.0013%@1kHz, Po=100mW, 300Ω
0.0016%@1kHz, Po=50mW, 32Ω
Frequency Response: DC-100kHz (+0, -0.7dB); DC-600kHz (+0, -3dB)