The Quloos QA390 is a hi-fi lossless music player, DAC, decoder, and headphone amplifier combined into an all-in-one mobile unit. It is powered by four 3300mAh Panasonic 18650 batteries that makes for a truly mobile hi-fi unit with 8-10 hours of high quality music listening. Its balanced amp can output more that 20V and easily drive high impedance headphones. On top of this, with a final stage power tube current output capability of 2700mA, the QA390 can drive low resistance and low sensitivity headphones as well. More than 30 ultra-low noise power chips provide clean power for each circuit device for a clean sound experience.

The QA390 comes with two AK4497EQ D/A chips, 1000000uF low internal resistance super capacitor for digital and analog partial isolation power supply, two femtosecond crystal designs, high-speed precision-controlled CPLD clock processing, and global clock unified/synchronous operation mode. It has a built-in single-chip single-threaded SD card pure tone player, a two-way USB interface, and a bluetooth input for easy connection to mobile phones. Finally, it comes with complete headphone interface - 3.5mm, 6.5mm single-ended interface and 2.5mm, 3.5mm, 4.4mm, XLR balanced interface.

Specs:

• Internal Playback Storage Media: External SD card or TF card, FAT32 format, currently supports a maximum capacity of 512GB
• Internal Playback Support Code Rate: 16-32Bit, 44.1kHz-352.8kHz, DSD64-DSD128
• USB Interface
• USB B Port: Supports 32Bit/384KHz4 PCM and DSD256
• Micro USB Port: Supports 32Bit/384 KHz PCM and DSD128
• Bluetooth: Bluetooth 5.0, LHDC, AAC encoding
• Coaxial Input: 75Ω matched impedance, Supports 24Bit/192KHz and DSD64 (DoP)
• Fiber Input: Supports 24Bit/192KHz and DSD64 (DoP)
• Coaxial Output: 0.5Vp-p75Ω, Supports 24Bit/192KHz and DSD64 (DoP)
• Fiber Output: Supports 24Bit/192KHz and DSD64 (DoP)
• Analog Output:
• Frequency Response: 20Hz-20kHz
• Signal to Noise Ratio: 122dB
• Dynamic range: 121dB
• Resolution: 120dB
• Distortion: 0.0005%
• Output Level:
• RCA (L&R) 2.5V (closed pre-level)
• XLR (L&R) 5.0V (closed pre-level)
• SE (unbalanced) maximum 10.5Vms (high amp voltage, ultra high gain, 600Ω load)
• BAl (balance) up to 21Vms (high amp voltage: ultra high gain, 600Ω load)
• Amp Output Impedance:
• Unbalanced: 0.13Ω
• Balanced: 0.2Ω
• Headphone Matching Impedance: 8Ω-600Ω
• Single-Ended Headphone Port Rated Output Power:
• 32Ω, 1000mW/ch amp high voltage, high gain
• 300Ω, 360mw/ch amp high voltage, super high gain
• 600Ω, 180mW/ch amp high voltage, super high gain
• Balanced Headphone Port Rated Output Power:
• 32Ω, 1300mW/ch amp voltage, high gain
• 300Ω, 1200mW/ch amp high voltage, super high gain
• 600Ω, 720mW/ch amp high voltage, super high gain
  
• Decoding Chip: Dual AK4497EQ
• LPF: Dual AD797
• Volume Control (including preamp volume control): PGA2311UA analog program control volume
• Reference clock jitter: 0.088 picoseconds (88 femtoseconds)
• Charging Interface: Available Type-C port, DC port, fast charging, QC compatible
• External Power Supply: DC5.5 x 2.1 port, can also be charged (panel switch selection)
• Battery Life: 8 to 10 hours
• Charging Time:
• Type-C General Charge: 8 to 9 hours
• Type-C Fast Charge / DC Port: 4 to 5 hours
• Product & Remote Control Material: Aluminum CNC Integrated Finishing
• Product Weight: 1.8kg
• Product size: 20cm x 18cm x 4.45cm