Description

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. 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Sign Up Now ! 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 Payment Delivery details Return Policy About us Contact us Payment Safe and secure payment by PayPal. Delivery details 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). Return Policy 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 . Feedback is very important to us just like our lives, please DO contact us before you leave a neutral or negative feedback, we will provide better solutions until you are satisfied. About us 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. Contact us 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-Friday 09:00 AM - 18:00 AM New York(US) Sunday to Thursday 08:00 PM - 05:00 AM London(UK) Monday-Friday 01:00 AM - 10:00 AM Paris(FR) Monday-Friday 02:00 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. Home Feedback Save Seller New Listed Ending Soon Contact us