Questyle CMA400i Headphone Amplifier DAC

Questyle CMA400i Headphone Amplifier DAC
Questyle CMA400i Headphone Amplifier DACQuestyle CMA400i Headphone Amplifier DACQuestyle CMA400i Headphone Amplifier DACQuestyle CMA400i Headphone Amplifier DACQuestyle CMA400i Headphone Amplifier DAC
(£665.83 Exc. VAT)
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Questyle CMA400i Balanced Headphone Amplifier and Digital Audio Converter

Questyle's CMA400i is a hybrid digital-analogue converter and headphone amplifier rolled into one. It is the most affordable of the CMA 'Current Mode Amplifier' series to-date. Complete with Questyle's patented 'True DSD' technology and AKM AK4490 DAC chip, the CMA400i has the capability to process all DSD signals without any PCM conversion.

Shipping typically 1-2 days


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 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.

The “Function” switch on the front panel is to switch between “Headphone Amplifier” and “Pre-amplifier”. A LED indicator will show you whether the working “Function” is “AMP” or “Pre-amp”, namely, to focus on current function.


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 4PIN 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.

True DSD Processor

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.

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.

High-end components ensures ultra-high fidelity sound. Power supply plays a vital role. Customized Noratel toroidal transformer. Over 10 groups independent power supply system. Care about every single detail


CMA400i’s chassis is made of aircraft-grade Aluminum 6063 and manufactured by Foxconn, black and sandblasted chassis, which ensures that CMA400i remains at 55℃ even works in pure Class A status for long time. 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.

Each panel passed fine machining by CNC device, tolerance under ±0.02mm, volume knob tolerance under ±0.005mm, processed with top level CNC standard.


Build a PC Hi-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 written in two copies, one is put in the product packing box for the customer, and another is kept in a safety box at Questyle to aid in following up and maintaining.

  • Finish: Black
  • Chassis Materials:  special CNC tooled aluminium
  • Dimension: 279mm[W]×189mm[D]×55mm[H]
  • Weight: 84.65oz (2.4kg)
  • Working Status: Pure Class A
  • Voltage: 100-120V or 220-230V, switchable
  • Power Consumption: 17W
  • Preamp/DAC Section:
  • 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
  • Headphone 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; 980mW @ 32Ω (normal headphone jack);  418mW @ 300Ω; 3920mW @ 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)




UK Delivery

  • FREE delivery via DPD Local By 12pm on orders to value over £300, including one hour delivery window service 'Predict & Follow My Parcel'.
  • Royal Mail Special Delivery By 1pm costs between £5.00 - £10.00 on orders to value under £300, dependent on weight.
  • Saturday or Sunday delivery available upon request for supplemental charge.

EU Delivery

  • £25 delivery charge 'Flat Fee' via DHL Europe by Road service (3-5 days) which provides comprehensive tracking of shipments online.
  • £60 delivery charge 'Flat Fee' via DHL Europe by Air service  (1-2 days) which provides comprehensive tracking of shipments online.

USA & Canada Delivery

  • Services based on your order being shipped to the U.S. and Canada are calculated as follows:
    £100 delivery charge 'Flat Fee' via DHL international 'Day Definite' service per parcel.
    Receiver is responsible for the payment of local Duties and Taxes.


  • Not all products are available for order into Europe, USA & Canada


  • Full manufacturer's warranty on all new purchases. Standard warranty is typically 2 years with some goods coming with 6 years manufacturer's warranty.
  • Goods purchased in UK and EU are covered by the Consumer Contracts Regulations.

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