Quloos QA860 HiFi Digital Lossless Music Player

Description

QLS QA860 HiFi digital lossless music player is QLS-HiFi stop line digital music playback equipment that integrated digital music player, DAC and headphone amplifier altogether. QA860 is based on the hot QA660 digital music player with dedicated improvementon the digital output circuit, along with the DAC and headphone amplifier module which we spent over 2 years on developing and continuing optimizationthrough testing more than 10 major hardware version.

The single threaded software framework, the extreme-low jitter clock process circuit, the digital / analog completely separated power supply loops and full isolated mounting rooms for each module are the keys for QA860 to enter into the Hi-End world with far beyond a lot of Hi-end level desktop CD players.

The Single Threaded Software Framework

QA860 implemented QLS-HiFi s unique proprietary technology C the single threaded software framework. This technology ensured ultra-low jitters and high accuracy in playback of digital music by occupying the whole CPU with the single music reading and decoding program during the music playback.We keep it simple as always for supporting the simplest SD media cards only, however on the other hand we make every attempt to improve the back end qualities so providing the best value to againstthe priceto the true audiophiles. QA860 is the continuing persistence in pursuit of our belief on HiFi equipment development.

24Bit / 192KHz wav and DSD Support

QA860 supports Studio Master wav files in 24Bit / 192KHz and DSD64 / 1Bit / Stereo. DSD files can be streamed out of the digital output in DoP format, and converted to analog singles directly through the internal DAC as well.

Highlights

01 Dual 0.5PPM TCXO for 22.5792Mhz and 24.576Mhz.
02 High standard power supply design:
    - 2 customized toroidal transformer for digital and analog circuits separately with vibration isolation and absorbing design, and without interfering the digital clock circuit completely.
    - TI top line RF LDO for supplying the DAC chips and clock circuits, which has been proved more suitable for the digital circuit than the top line LDO of Linear Technology in our long time test.
    - Mono concept in designing power supply circuit for each independent function unit.
    - Schurter filter power entry module and fuses.
03 Pre-amplifier inside with on / off and volume control through the remote controller (AD1955 is fixed level output to process DSD, as the result the inside pre-amplifier is not functionable).
04 High power headphone amplifier integrated for Hi / Low impedance headphones.
05 Case vibration isolation design and manufacture.
06 4-layers PCB for all circuit boards.

Speification

01 DAC: AD1955, I/V: OPA2134 x 2, LP and pre-amp: LME49720 x 3.
02 Headphone: LME49720 + OP2134 + TPA6120.
03 Support: 16Bit / 24Bit, 44.1-192Khz, DSD 1Bit 64FS.
04 Audio format supported:

WAV	16 / 24Bit, 44.1~192kHz.
AIFF	16 / 24Bit, 44.1~192kHz.
FLAC	16 / 24Bit, 44.1kHz~48kHz, compression level 0~8.
APE	16Bit, 44.1kHz, compression level fast and normal.
ALAC	16Bit, 44.1kHz
MP3	16Bit, 44.1 / 48 kHz, 96k bps~320k bps, CBR / VBR / ABR encoding.
CUE	ANSI / UNICODE / UTF-8 Encoding.
DSD	DSD64 1Bit, Stereo - DIFF DSF SACD ISO.

05 Digital Output: PCM / Dolby Digital output / DTS Digital output / DSD (DoP V1.0).
06 Digital Output: Coaxial x 1, Optical x 1.
07 Digital Input: Coaxial x 1, Optical x 1 (up to 24Bit / 192Khz).
08 Analog Output: RCA x 1, XLR balance x 1.
09 Headphone: 6.35mm x 2
10 Analog Output:
    - RCA output level: 2.44V RMS
    - XLR output level: 4.88V RMS
    - Frequency response: 0-50Khz
    - S/N: 120dB
    - Dynamic Range: 118dB
    - Total Harmonic distortion: 0.0007%
    - Headphone power output: 600 Ohm@120mw, 300 Ohm@250mw, 150 Ohm@5500mw, 64 Ohm@1.2W, 32 Ohm@2W
11 Power: <30W
12 Input Voltage: AC 110V and AC 220V selectable
13 Dimensions: 215mm x 330mm x 100mm
14 Weight: 5kg

Internal PCB board

In order to improve the quality and sound quality, components are subject to change without notice.)

Package list

01. QA860 Player x 1.
02. Remote Control x 1.
03. Power cable x 1.
04. 16GB Class10 SDHC Card x 1.
05. SDHC SD USB 2.0 Memory Card Reader x 1.
06. English User Guide x 1.