CMA400i, 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.


CMA400i can be placed straight with a specially designed base 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

CMA400i is built with four groups of pure Class A Current Mode Amplifiers and all discrete circuit, which achieves the ultra-low distortion level of 0.0006% and ultra-wide bandwidth 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

Full-balanced Amplification

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 design of Gain Control switch at the bottom of the chassis benefits CMA400i with perfect driving power for different headphones.

Direct Stream Digital

Direct Stream Digital

PCM384 | DSD256 | 32Bit

CMA400i is designed with Questyle patentedTrue DSD technology and AKM AK4490 DAC chip. It processes DSD signals without any PCM converting and provides True DSD.


Power Supply Plays a Vital Role

Customized Noratel toroidal transformer

Care about Every Single Detail

Get Harmonic Oscillation under Control

Get Harmonic Oscillation under Control

CMA400i’s chassis is made of aircraft-grade Aluminum 6063 and manufactured by Foxconn. The “mutual-bit” structure and 10mm thick chassis with the CNC-tooled aluminum feet help to reduce the natural resonance to the lowest level and make CMA400i strong and stable as well.

Build a PC High-end System


Build a PC High-end System

CMA400i has a great capability for signal processing, supporting Win XP, Vista, Win7, Win8, Win10 and Mac OS. When connecting to a computer, it is only responsible for sending data. So, everything related to sound quality will be guaranteed by CMA400i, no matter it is a song, a film or a game.



Match CMA400i with Traditional Digital Sources and Active Speakers

The performance of a traditional Hi-Fi system can be much improved by CMA400i because of its completely separate DAC with optical and coaxial interfaces. Another distinctive feature of CMA400i is switching between “Headphone Amplifier” and “Pre-amplifier” by the “Function” switch on the front panel. In DAC mode, CMA400i supports RCA and XLR pre-amp outputs which can be selected by the ADJ/FIX switch on the rear panel.




Each CMA400i is tested by QC engineers from Foxconn with Audio Precision AP2722 before shipping and has its testing report filled. Every testing report is unique and kept in a safety box at Questyle to aid in following up and maintaining.



279mm[W] × 189mm[D] × 55mm[H]


Pre-amplifier and DAC Section

- Output Interface:

A 6.35mm standard headphone jack

A 4-PIN full-balanced headphone jack

A 2.5mm full-balanced headphone jack

- Max Output Power (Po):

106mW@300Ω; 650mW@32Ω (normal headphone jack)

418mW@300Ω; 1200mW@32Ω (balanced headphone jack)

- THD+N:

0.0013%@1kHz, Po=100mW, 300Ω

0.0016%@1kHz, Po=50mW, 32Ω

- Frequency Response:

DC-100kHz (+0, -0.7dB); DC-600kHz (+0, -3dB)

- USB Type B Input:

- Output Interface:

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

- THD+N:

RCA:< 0.0009%; XLR:< 0.0009%

- SNR:

RCA: >110dB; XLR: >113dB (non-weighting)

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