Excellent Headphone Amp Section
The Questyle Audio CMA800i headphone amplifier section follows Questyle’s patented "Current Mode Amplification" design used in their flagship headphone amplifier, the Questyle Audio CMA800R, in fact , most of the components used are the same. The ultra low 0.00026% distortion, ultra wide bandwidth, up to 850kHz (+0, -3dB), and Super-current pure Class A architecture enables the Questyle Audio CMA800i’s amplification to be unparalleled among all-in-one DAC/amplifier models.
A World Class DAC section
Unlike other DACs that claim DSD support, yet in actuality provide DoP (DSD over PCM), the Questyle Audio CMA800i accepts the DSD bit-stream directly from your computer, bypassing your computer’s audio processing and digital volume control as well as the Questyle Audio CMA800i’s digital filters, to provide True DSD, the way it was meant to be heard, without requiring expensive difficult to install proprietary connectors, or as is the case with DoP breaking up the bit-stream into 16bit packets and compressing them into a PCM data-stream and then uncompressing them at the other end, buffering them, then reassembling the bit-stream so that it may be sent to the DAC as DSD, all of which requires an extreme amount of processing at both the computer end and the DAC end to perform in real time (which invariably leads to latency, data loss, etc), not to mention a 33% increase in bandwidth requirements for the USB ports and cabling.
IIR Digital Filter
Currently the majority of DACs use FIR (finite impulse response) digital filters, but research and testing has shown that our ears are very sensitive to the pre-ring that FIR digital filters add to the impulse wave, making the music sound incoherent and unnatural. The Questyle Audio CMA800i offers the more advanced IIR digital filter, which completely eliminates the pre-ring from the impulse wave producing a more natural sound.
Seperate Pre-Amplifier Section
The Pre-Amplifier output is another unique feature of the Questyle Audio CMA800i. Many manufacturers, when designing an all-in-one model, use the headphone amplifier circuit loop to support the pre-amplifier output to reduce costs. To achieve the best possible sound performance, the Questyle Audio CMA800i is designed with a totally independent pre-amplifier, even the power supply supporting the pre-amplifier circuit is independently located.
In keeping with Questyle Audio’s no-compromise approach. and to make usage more convenient, an analog volume control circuit is employed, using an ALPS27 motor controlled potentiometer for operation via remote control.
Hi-End Components Throughout
Superior sound performance requires the use of Hi-end components. Questyle uses only the very best in the Questyle Audio CMA800i, each component undergoing an extensive testing and selection process, with many being custom made and purpose built.
10mm Thick Aluminum Cover and Bottom Chassis
The Questyle Audio CMA800i aluminum chassis is produced by Foxconn using precise CNC tooling machines. The upper cover and bottom chassis “mutual bit” structure design, provides the Questyle Audio CMA800i with stable heat, excellent control of sympathetic vibration and excellent shielding from RFI/EMI radiation.
Each product is burned in for 72 hours before shipping and every product has its own serial number and test report. The engineers prepare two copies of the test report, one report is put in the box for the customer and another report is kept in a safety deposit box at Questyle. If there are any questions, about any product, at anytime, Questyle is able to find the report, for that unit, to aid in solving any issues. For distributors, Questyle can provide a professional technical guide.
- Technical Specifications
Colour Silver Warranty 1 year (local) Availability Preorder / Backorder (currently unavailable) Product Type Amplifier (Headphone), DAC (Digital-Analog Converter) Style/Type Desktop Features DSD, Dual Headphone Output, Line-in, Line-out, Optical Input Sampling / Bitrate PCM 44.1-192k/16-24bit and DSD Source Code following standard SACD format Frequency Response (Hz) DC-200kHz(+0，-0.5 dB)；DC-850kHz(+0，-3 dB) Signal-to-Noise Ratio (SNR) 118 dB Total Harmonic Distortion (THD) 0.00026%@1kHz，Po=100mW，300Ω Output Power 180mW（7.5Vrms）@300Ω；1W@32Ω Input Connectivity Coaxial, Optical, RCA, USB Output Connectivity 6.35mm Stereo, Coaxial (SPDIF), RCA / Phono, XLR Balanced Additional Tech Specs
Headphone Amp Section:
Gain: 11.8dB (3.9times)
Max Output Power（Po）:180mW（7.5Vrms）@300Ω；1W@32Ω
SNR: 118 dB
Frequency: DC-200kHz(+0，-0.5 dB)；DC-850kHz(+0，-3 dB)
Input: Internal DAC output, or External RCA input,switchable
Output: Dual 6.35mm Standard Stereo Jacks
DAC and Pre-Amp section:
Input：SPDIF input and output, USB Type B input
SPDIF input and output: Standard PCM 44.1-192k/16-24bit, USB：PCM 44.1-192k/16-24bit and DSD Source Code following standard SACD format
PC OS to match USB input：Win XP,Vista,Win7,Win8 and MAC OS
Digital Filter：PCM Mode：Switchable IIR(MP) and FIR (LP) True DSD Mode: No filter
USB supported Kernal stream：WASAPI，ASIO，KS
Analog Output：Balanced (XLR) and unbalanced (RCA)
Max output amplitude：XLR：8.6Vrms；RCA：4.3Vrms
THD+N：< 0.005% for both XLR and RCA
SNR：>107dB for both XLR and RCA
Voltage：100-120V or 220-230V switchable
- User Reviews