QLS QA350 MOD V2+ Lossless Music Player HIFI Headphone Amplifier DAC Support WAV Silver

QLS QA350 MOD V2+ Lossless Music Player HIFI Headphone Amplifier DAC Support WAV Silver

Description:
QA350 MOD V2+ is an all-in-one portable SD card HiFi wav music player. It has a high quality DAC and headphone amplifier integrated into its tiny body. The headphone output is able to drive most 16-300Ω headphone in the market.

It is upgraded from QA350 with huge improvements regardless of the balance of frequency and timbre, resolutions, accuracy, low and high frequency extension and dynamic range.

QA350 MOD V2+ upgrades the headphone amplifier from MAX9722A to AD8397 by taking advantage of AD8397’s Rail-to-Rail and high output current technology. In order to push the performance of QA350 platform to the maximum potential, the engineering team put a lot of efforts in optimizing power supply systems and PCB, and more than 10 versions of PCB were tested to get the final PCB design.
 
QA350 MOD V2+ employs 7.4V Li-polymer battery normally used on aircraft models. This type of battery has very low internal resistance and high discharge rate. The momentary discharge current is able to reach couple of amperes easily. This gave QLS design team the opportunity to get rid of the voltage boost circuits and voltage reversal circuits that are very common to see in the portable players. Therefore QA350 is able topresent the music with enhanced bass and transient response, as well as ultra-low high-frequency noise and full of details.

The good thing kept on QA350 is the single threaded real time audio play program with SD card. This unique technology is QLS’s guarantee to be HiFi. It is without any interrupt to steam the music files, other control functions are carried by another separated microprocessor. It achieved extremely high accuracy on the time sequence when streaming music files from the SD card. Moreover a special customized 11.2896 2ppm TCXO with jitter lower than 10PS is used as the main sampling clock.Thus the whole system reached our goal on the recovery of musics.

Specifications:
- Support format: 16bit 44.1K WAV (the same with CD ripping and file format).    
- SD/SDHC up to 128GB with FAT32, 90 folders up to 900 music tracks
- (Please use TOSHIBA original card, other brands of sd card may be a problem.)    
- Firmware upgradeable    
- Digital output chip: CS8406.
- DAC Chip: Wolfson WM8740.
- LVP: AD8656.
- Headphone Amp chip: AD8397.    
- Output:
  Digital Coaxial RCA
  Digital Optical(round)
  Analog Line out: 2V (RMS), frequency response 20Hz-20KHz, SNR> 100dB, Distortion <0.002%
  Headphone out: 500mW/16Ω;   250mW/32Ω;   49mW/300Ω;  Frequency response: 20 Hz-20Khz;
- THD + N (total harmonic distortion plus noise): <0.003%, matching impedance: 16 ohm --- 300 ohm    
- Battery Type: 7.4V Li-Po battery of Model General Specifications, maximum size: 55mm * 31mm * 16mm; the capacity is usually among 800-1100mAH.    
- Battery life: 4 to 6 hours.    
- Charging time: 1.5-3 hours (when charging, playing music can available powered by the external power supply)    
- Charger: 110-240VAC, 800mA/S, balanced 2 cell charger.    
- Power: 150-180mA (LED backlight OFF), 200-300mA (LED backlight ON), 9VDC external input.    
- Remote control    
- Dimension: 135mm * 78mm * 27mm (excluding the output socket, switch, button, etc.)
- Single Weight (with battery): 0.3kg
- Packing Weight: 0.75kg    
- Color: Silver

Package includes:
- QA350 MOD V2+ Player*1
- Remote Control * 1
- Toshiba 16G SD Card * 1   
- Card Reader *1  
- 3PIn charging cable
- 3.5 to RCA connection cable
- Balance charger * 1
- User Guide x 1