Out Of Stock QLS QA661 - QA661

QLS QA661 24bit/192KHz WAV/APE/FLAC Hi-Fi Digital Audio Player&USB Bridge to Computer


  • QA661 is a Hi-End digital music transport, It is based on the QA860 digital music player's digital output port with improvement on the digital output circuit, and We spent over 2 years on developing and continuing optimization through testing more than 10 major hardware version. This is a true competitor to most of the desktop Hi-End CD players, and able to boost the performance of your whole system with its’ ultra-high-fidelity digital output that ensured by the single threaded software framework, complicated power supply systems and clock circuits.
  • The single threaded software framework
  • QA661 implemented the latest version of QLS-HiFi’s unique proprietary technology – the single threaded software framework. This technology ensured ultra-low jitters and high accuracy in playback of digital music, and set the new standards for the digital output of a digital music player at some points.
  • Why we spent over 3 years of hard work and several dozen thousands of cost in developing this software framework by creating several dozen thousand lines of completely new code from zero? Because we believe the primary task for a digital music player is high-fidelity sound recovery. QA661 is the result of our persistence in pursuit of our belief on HiFi.
  • The vital aspect of single threaded software framework is running different programs one by one in serial processing mode, and audio program is on the highest priority level. Anytime if the audio playback program calls for reading and decoding audio files on the SD card, the audio playback program overrides all other programs in running for the call right away. Once the audio data length decoded from the audio files reached a set point, this data segment then is sent to the I2S buffer automatically with overriding all other microprocessor commands. The microcomputer system reserves 200%more of the normal audio playback program running time from system for sending the audio data segment to the I2S buffer according to the precise calculation by our engineers. In order to providing enough time resource for audio playback program some other functions such as remote control are kept out from the main microprocessor, and carried by other independent chips. The whole process therefore providing a significant improvement in reducing jitters and streaming music data flow accuracy.
  • Digital processes may represent a sound exactly. Just as a professional taster might select the exact vintage after careful inspection, so the computer will read, and re-read a disc as many times as it needs to, to ensure it has the “exact” sound. This process is more accurate than a CD player may achieve: the player will read through only once. It does not have the benefit, as the taster does, to go back and resample.
  • 24bit/192KHz wav and DSD Support
  • QA661 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.
  • QA661 Also is a XMOS USB Bridge to Computer
  • (becoming a “bridge” between your computer and your DAC. )
  • The QA661 also is an asynchronous High Speed USB to digital audio interface that extracts the highest possible audio quality from computer audio sources.
  • The QA661 is have High Speed USB 2.0 input data connection – Sampling rates up to 192 kHz and word lengths up to 24 bit are supported.
  • Great care was taken in the design of the QA661 to isolate the noisy computer/USB environment from the digital audio output. The USB receiver and processing are powered by the computer, while the output line drivers are powered by a separate isolated linear power supply.
  • The QA661's USB is designed to work with both Apple Macintosh and Windows PC computers. Microsoft Windows PC’s require the included Windows driver which works with Windows XP, Vista and 7 and windows 8.


  • Streaming music data flow from the SD card to the digital outputs with Ultra-low jitters and high accuracy by the single threaded software framework together with 2 sets of independent sampling clock circuits (44.1K/48K) and mono-system-aspect-design in separated power supply systems and grounding systems.
  • 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.
  • WAVPack: 16bit, 44.1kHz, compression level fast mode and high quality.
  • ALAC:16bit, 44.1kHz
  • MP3: 16bit, 44.1/48 kHz, 96k bps-320k bps, CBR/VBR/ABR encoding.
  • DSD: DSD64 1bit, Stereo---DIFF、DSF、SACD ISO.
  • CUE: ANSI / UNICODE / UTF-8 Encoding.
  • Digital Output:(outputs can be used at the same time without interfering each other)
  •  Optical
  •  EBU/AES
  •  RCA Coaxial
  • WordClock Output: The QA661 is including the low-jitter wordclock output for direct synchronizing external d/a converter.  (The word clock output is valid only for the internal SD card player mode, invalid in the use of USB input or external coaxial input.)
  • External coaxial input ---QA661 has an external coaxial input port, which can be used for process the input signal and driving the output, thereby improving the sound quality.
  • Support SD/SDHC/SDXC up to 128GB SDXC with FAT32 (upgradeable with further firmware upgrade)
  • OSD supports English, simplified Chinese and traditional Chinese.
  • Support Software (Firmware) Upgrade.
  • Output voltage: Coaxial (0.5V p-p), XLR (5V p-p balance)
  • Digital output formats: PCM / Dolby Digital / DTS
  • Power: 9-11W
  • Input Voltage: AC 110V and AC 220V selectable
  • Dimensions: 215mm x 315mm x 100 mm
  • Weight: 4.1KG


  • QA661 audio Player
  • Remote Control (not include AAA battery for remote control)
  • Power cable
  • 16GB Class10 SDHC Card
  • SDHC SD USB 2.0 Memory Card Reader(Card Reader not Warranty)
  • USB Cable
  • English User Manual


  • Will ship via DHL/UPS/EMS or AirMail Parcel through Hong Kong Post .
  •  It is required to put your phone number on the parcel, please leave me your contact number when you pay.

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Due to the impact of the COVID-19 pandemic, global international shipping will delays. The delay at our Hong Kong post office is very serious, so we have changed to other fastest or most efficient international shipping. Now the normal estimated delivery time may be delayed by about 1-2 weeks. In some countries where is higher free-tax rate, we will provide free courier service as much as possible.

Free Shipping

All listed items will be shipped though Registered Airmail with tracking number if there is no extra shipping method option listed or shipping description in the product page.

Economy shipping: Will be shipped without tracking number.

Registered Airmail : Will be shipped via such as Hong Kong post , Deutsche Post , Netherlands Post , Singapore Post, you can leave us a message if you have any requirement about the shipping method .

It will be shipped via Hong Kong Post by default, Europe countries can choose to be shipped via Deutsche Post or Netherlands Post, it is also FREE, pls leave us a message if needed.

Express service: Will be shipped via DHL/EMS/UPS/FedEx

  • Views: 13811
  • Brand: QLS
  • Product Code: QA661
  • Availability: Out Of Stock
  • $649.00
This product has a minimum quantity of 2

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