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Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp APTX-LL

Item description

Features
  • Douk Audio U4 is a multi-function HiFi audio device, with Bluetooth 5.0 and USB input, stereo RCA, 3.5mm AUX, 3.5mm headphone jack output, which can be used as a Bluetooth receiver, a USB DAC, a headphone amp and a stereo preamp, compatible with phone, computer, power amplifier, active speakers and so on.
  • Adopting classic 6N3 vacuum tube(much better than 6J*) to effectively eliminate the harsh digital sound, providing HiFi clear, soft and smooth, warm and sweet tube sound. The sound field is wide, especially suitable for vocals, strings, light music, classical music, etc.
  • High-end components and unique design:
Bluetooth 5.0 (QCC3003chip) supports APT-X, makes its sound transmission low-delay and lossless.
PCM2704 DAC chip, supports 16bit 48KHz transmission, compatible with Windows / Mac / Linux system and Android mobile phone with OTG function, no need for driver, plug and play.
Headphone amp uses classic MAX9722 decoding chip, 300mW output power can drive most 16-600 ohm headphones.
  • Super mini size and exquisite appearance, with power and select switch, working indicators and volume control. Using all-aluminum chassis CNC machined and laser carving, looks fashionable and powerful, perfectly suitable for your desktop or a smaller space in your home or office
Parameters
  • Audio input: Bluetooth 5.0 / USB
  • Audio output: stereo RCA / 3.5mm AUX / 3.5mm headphone jack
  • Bluetooth chip: QCC3003
  • Decoding chip: PCM2704 
  • Headphone amp chip: MAX9722
  • Signal to noise ratio: >99 dB
  • Dynamic range: >99 dB
  • Amp rated power output: 300MW
  • Amp impedance 16-600 ohms
  • Distortion: THD+N: 0.004% (RL > 10 kΩ) /  0.020% (RL = 32 Ω)
  • Colour: black
  • Dimensions(L*W*H): 97*77*32mm / 3.82*3.03*1.26in
  • Net weight: 250g / 0.55lb
  • Package weight: 470g / 1.04lb
Packing List:
  • 1*U4 Headphone Amp
  • 1*6N3 tube
  • 1*12V Power Adapter
  • 1*USB Cable
  • 1*Bluetooth Antenna
Safe and secure payment by PayPal.
Please leave VALID TELEPHONE NUMBER which is necessary and very important.
 
Customs Clearance
We are NOT responsible for any customs duties fee.
We are NOT responsible for any import tax or customs delay.
 
Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). 

Free Return Within 30 Days

We provide  return within 30 days for all items you bought on eBay, full refund and return shipping will be provided.

1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes).

If you are satisfied with our products and service please leave a 5-star StarStarStarStarStar. Positive feedback rating Feedback is very important to us just like our lives, please DO contact us before you leave a neutral Neutral feedback rating or negative Negative feedback rating feedback, we will provide better solutions until you are satisfied.

 

 

 

Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc.
 
As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable.
 
We will spare no efforts to bring great products and service for customers and extremely to improve our customers’ listening experience.
Please don't hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at:
 
 Working time

Beijing(CN)Monday-Friday09:00 AM - 18:00 AM
New York(US)
Sunday to Thursday08:00 PM - 05:00 AM
London(UK)Monday-Friday01:00 AM - 10:00 AM
Paris(FR)Monday-Friday02:00 AM - 11:00 AM
 
During holiday, please allow us to response you early next week. Please don't leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation.
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