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 QA350 Player Latest version of the firmware download                       QA-550 Player Latest version of the firmware download  
 QA350 Player 03 Version Fiemware updata file                Readme   
 QA350 Player 02 Version Fiemware updata file                                     QA350 Player User Manual
 QA-550 WAV Player 06 Version Firmware update file       Readme    QA-550 WAV Player 04 Version Firmware update file  
 QA-550 WAV Player user manual                                                              digital input receiver Chip Datasheet CS8414
  SPDIF Input--Coaxial input board Schematic                                         SPDIF input Board User Guide
  Extreme 05 1543 DAC Schematic                                                            USB TO SPDIF Board Schematic
  56W transformer for USB_1798DAC User Guide                         50W transformer for Extreme 05 1543 DAC User Guide
  DAC Chip Datasheet TDA1540                                                                 DAC Chip Datasheet TDA1541
  DAC Chip Datasheet TDA1541A                                                               DAC Chip Datasheet TDA1543
  DAC Chip Datasheet PCM1702                                                                DAC Chip Datasheet PCM1704
  DAC Chip Datasheet PCM1710                                                                DAC Chip Datasheet PCM1716
  DAC Chip Datasheet PCM1738                                                                DAC Chip Datasheet PCM1739
  DAC Chip Datasheet PCM1793                                                                DAC Chip Datasheet PCM1794
  DAC Chip Datasheet PCM1798                                                                DAC Chip Datasheet PCM56
  DAC Chip Datasheet PCM63                                                                     USB Chip Datasheet PCM2902
  USB Chip Datasheet PCM2906                                                                USB Chip Datasheet PCM2707
  digital input receiver Chip Datasheet DIR9001                                     
　

SHEN ZHEN QLS ELECTRONIC TECHNOLOGY CO.,LTD. (QLS-HiFi)
ADD:Huiningge 13G,qianlong garden,Longhua,SHENZHEN,GUANGDONG P.R.CHINA
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