QULOOS QLS QA390 AK4497EQ*2 HiFi Lossless Music Player DAC Decoder Headphone Amplifier

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Price: $1,189.99 $1,399.99
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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
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; 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


Shipping Fees

Worldwide Free Shipping on SHENZHENAUDIO, Please allow 1-3 business days for conduct Quality Control in order to ensure the products quality.

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.

Which Couriers To Use?

Given the amount of shipping partners we work with and the vast coverage area we serve, there are likely regions with much longer transit times than others. If you have any feedback, suggestions, or problems with the courier of your shipment, please feel free to submit a support ticket via the "Contact Us" button below.

Our goal is to provide our customers with the best shipping experience possible at a reasonable cost. This is why we constantly negotiate with existing shipping partners for lower rates and actively test new couriers for potential opportunities.

PO boxes or APO/FPO

The ability to ship to PO boxes or an APO/FPO address depends on the item's weight. If an item weighs more than 9 pounds, we won’t be able to ship to these addresses because of our current courier agreements.

To determine if your order is eligible for shipment to PO boxes or an APO/FPO address, please contact SHENZHENAUDIO Support.

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

Please keep in mind that these are rough estimates and shipments can be delayed due to unforeseen circumstances, like postal strikes or severe weather.

If, for some reason, you don’t receive your order within the estimated time frame provided above and suspect that it might be lost in transit, please submit a support ticket from your transactions page and we can look into the order with the courier. Lost-in-transit requests must be submitted to SHENZHENAUDIO Support within 4 months of the date of shipping or before the courier archives the tracking information.

Easy 30-Day Return Policy

If you are dissatisfied with your purchase for any reason, you may return it to SHENZHENAUDIO within 30 days of the received date, subject to the conditions and exclusions below.

Eligibility Conditions

Please read conditions below. If all conditions are not met, SHENZHENAUDIO reserves the right to refuse the return. All returned items must be in new condition, in their original unaltered box (including an intact UPC code) and must include all packing material, blank warranty cards, manuals and accessories. SHENZHENAUDIO can only refund the original purchase price. Shipping and handling fees are nonrefundable.

Defective or Damaged Items

Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.


Depending on where you live, the time it may take for your exchanged product to reach you, may vary. Please allow 3-5 business days for mail-in exchanges to be processed.

Refunds & Credits

Once we receive and inspect your item(s), we will credit your account. Please allow 5-7 days for a credit to appear on your account. In most cases, we will issue your refund in the same way you made the original purchase. Please note: we can only refund the original purchase price. Shipping and handling fees are nonrefundable.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.


To 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 support@shenzhenaudio.com.