QULOOS QLS QA390 AK4497EQ*2 HiFi Lossless Music Player DAC Decoder Headphone Amplifier
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1. Powered by a large-capacity battery, the internal current and voltage are designed according to the standards of high-end desktops. It is a truly removable decoding amp machine.
2. Dual 1000000uF low internal resistance super capacitor for digital and analog partial isolation power supply, similar to the dual-booster design of desktop machines.
3. Balanced amp can output more than 20V voltage, easily push high-impedance headphones.
4. The final stage power tube current output capability is 2700mA, which is very good for driving low resistance and low sensitivity headphones.
5. DAC chip adopts AK4497EQ*2 and supports ALL To DSD.
6. Two femtosecond crystal designs, high-speed precision-controlled CPLD clock processing, and global clock unified and synchronous operation mode.
7. Built-in single-chip single-threaded SD card pure tone player.
8.HWA (LHDC) HD Bluetooth input for easy connection to mobile phones.
9. Two-way USB interface, one for the phone or tablet (no camera kit required), and the other for an authorized Italian interface.
10. Four 3300mAH Panasonic (formerly Sanyo) 18650 batteries provide a total battery capacity of 31200mAH.
11. More than 30 ultra-low noise power chips provide clean power for each circuit device.
12. Headphone interface is complete, single-ended interface: 3.5, 6.35; balanced interface: 2.5, 3.5, 4.4, XLR.
Internal playback storage media: use an external SD card or TF card plus card sleeve, 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: use authorized Italian interface Combo384, and optimize hardware design, support 32Bit/384KHz4 PCM and DSD256
USB interface -- Micro port: use SA9227 interface, Apple phone and tablet do not need camera kit, support 32Bit/384 KHz PCM and DSD128
Bluetooth Receive: Support Bluetooth 5.0, support Huawei HD Bluetooth HWA (LHDC) and AAC encoding.
Coaxial input: 75Ω matched impedance, support 24Bit/192KHz and DSD64 (DoP)
Fiber input: support 24Bit/192KHz and DSD64 (DoP)
Coaxial output: 0.5Vp-p75Ω, support 24Bit/192KHz and DSD64 (DoP)
Fiber output: support 24Bit/192KHz and DSD64 (DoP)
Analog output parameters:
Frequency response: 20-20KHz
Signal to noise ratio: 122dB
Dynamic range: 121dB
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; balance: 0.2Ω
Headphone matching impedance: 8Ω-600Ω
Decoding chip: Ak4497EQ*2 LPF: AD797x2
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 available, fast charging, QC compatible
External power supply: DC5.5*2.1 port, can also be charged (panel switch selection)
Life time: 8 to 10 hours
Charging time: Type-C general charge: 8 to 9 hours, Type-C fast charge / DC port: 4 to 5 hours
Host & Remote Control Material: All Aluminum CNC Integrated Finishing
Product weight: 3.0kg in full package, net weight 1.8kg
Host size: 20cm*18cm*4.45cm
Packing size: 33cmx27cmx9cm
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
Balance the headphone port rated output power:
32Ω, 1300mW/ch amp voltage,high gain in
300Ω, 1200mW/ch amp high voltage, super high gain
600Ω, 720mW/ch amp high voltage, super high gain
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If a customer would like the order reshipped, they’ll be charged a reshipment fee. Customers may also be subject to a restocking fee of up to 20 percent of the product cost.
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PO boxes or APO/FPO
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Estimated Delivery Time
For customers in the continental United States:
5 to 14 business days from the date of shipping
For customers in Hawaii and Puerto Rico:
2 to 4 weeks from the date of shipping
International customers can expect longer shipping times, depending on the country in which they live:
Canada: 1 to 3 weeks from the date of shipping
Australia, New Zealand, Germany, France, and the UK: 2 to 4 weeks from the date of shipping
Other countries not listed above: 3 to 6 weeks from the date of shipping
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Defective or Damaged Items
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ShippingTo return your product, you should mail your product to: 4F 405, Building F, No.2 Shangxue Science and Technology North, Bantian Street, Longgang Dist, ShenZhen, 518129 Guangdong, China
If you’ve done all of this and you still have not received your refund yet, please contact us at firstname.lastname@example.org.