CMA600i

An All-in-One gear combine sound quality and fine art

DAC with Headphone Amplifier



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“Current Mode Amplification” Headphone Amp


       CMA600i inherits Questyle Audio flagship headphone amplifier patent “Current Mode Amplification” technology, adopts all discrete circuit design, working in pure Class A status. Thus it can provide best sound required ultra-low distortion (0.00042%) and DC-600kHz (+0, -3dB) ultra-wide frequency. Plus the high quality sound performance, CMA600i is capable to challenge world class Hi-end headphone amplifiers.   
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More about
“Current Mode Amplification”

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AKM AK4490 DAC Chip


    CMA600i selects AKM AK4490 as DAC chip. Different from other DAC chip, CMA600i is specially designed with a +/-7V ultra high voltage power regulator to independently provide power for AK4490, ensures CMA600i with ultra large dynamics range.  
CMA600i USB input supports  PCM 44.1k-384k /16-32bit signal, and True DSD64, DSD128, DSD256, DoP (DSD over PCM)64, DoP128 converting. It also supports 192k/24bit Optical and SPDIF inputs.

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Patent “True DSD Converting” 


CMA600i inherits Questyle patent “True DSD converting” technology. CMA600i drives program directly processes DSD source code of PC, and

CMA600i hardware provides special DSD channel to process the signal strictly under SACD standard.
As Mac OS doesn’t support True DSD converting yet, CMA600i is also designed to convert DoP signal.

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Specially Selected Components


Sound quality depends much on component. Plitron customized triode transformer,  over 10 groups of independent power regulation, specially seletected WIMA capacitors,  DALE resistors, Nichcon FG capacitor, Neutrik connectors… all these Hi-end components ensure CMA600i providing great sound.

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Craftsman Technology


On manufacturing, CMA600i is made in Foxconn factory under world top standard. Chassis is made of aviation aluminum, assembled in CNC “mutual bit” structure, 10mm in thickness to reduce resonance. Spikers are pure aluminum as well, specially tooled by Foxconn CNC machines. CMA600i provides space grey finish, fashionable and also full of technology.   

It took only three months designing CMA600i,
but  it took over a year testing and tuning-sound quality is most important!


After 5 different circuits applied, 50 components used, over 10 pairs of headphones and 5 pairs of typical active speakers matched more than 500 rounds, finally the CMA600i was born with perfect sound.

Strict Test Standard


Every CMA600i, after assembly finished, will be burnt strictly over 72 hours under high temperature and high voltage, and one more time before shipment. After that CMA600i will go over specification test by AP2722, then get a test report.

Every test report  has two copies. One is for customer, and the other is in Questyle for product tracking and maintenance.





Specification



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Chassis

Finish: Silver /Space Grey
Chassis materials:  special CNC tooled Aluminum
Dimension: 12.99”(330mm)[W]×11.81”(300mm)[D]×1.38”(55mm)[H]
Weight: 113oz (3.2kg)




Working Status: Pure Class A
Voltage : 100-120V or 220-230V, switchable
Power Consumption: 18W




Headphone Amplification section

Headphone Amplification section
Gain: 13.4dB (4.7 times)
Max output :
220mW @300ohm , 950mW @32ohm (single-ended)
630mW @300ohm, 1900mW@32ohm (balanced )

THD+N:0.00057% @1kHz, Po=100mW, 300ohm ;
0.00034%@1kHz, Po=50mW, 32ohm
SNR: 113dB
Frequency Response: DC-100kHz (+0,-0.7dB) ;DC-600kHz (+0,-3dB)
Sensitivity: 1.7Vrms
Input: Internal DAC output or external RCA, switchable
Output: Dual 6.35mm headphone jack, 1 x4-pin Balanced output





DAC and Pre-amp section

Supporting files
SPDIF and Optical: PCM 44.1k-192k /16-24bit
USB: PCM44.1k—384k/16-32bit, True DSD64, DSD128, DSD256, DoP64, DoP128
Supporting OS: Win XP, Vista, Win 7, Win8, Win 10 and Mac OS
Digital input: SPDIF, Optical, USB type B
Kernel Streaming:  WASAPI,  ASIO, KS
Digital Filter: PCM mode, IIR (MP) and FIR (LP) switchable;  DSD mode: no filter
Output: XLR and RCA
Max amplitude: XLR : 8.6Vrms;  RCA: 4.3Vrms  

Analog output
THD+N: RCA <0.00082%,  XLR <0.00064%
SNR: RCA >105dB,  XLR>121dB