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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25
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Description
Douk Audio U3 PRO HiFi Mini Class A Headphone AmplifierDescriptions Enhanced Compatibility: with 3. 5mm AUX stereo RCA input and 3. 5mm 6. 35mm headphone jack output, the U3 PRO is compatible with a wide range of audio sources, including MP3 players, iPods, smartphones, tablets, computers, and CD players etc. Its output can connect to various headphones, offering a versatile listening experience with support for most headphone models. Built in Voltage Boost Circuit: adopting innovative circuit design with
Descriptions
- Enhanced Compatibility: with 3.5mm AUX/stereo RCA input and 3.5mm/6.35mm headphone jack output, the U3 PRO is compatible with a wide range of audio sources, including MP3 players, iPods, smartphones, tablets, computers, and CD players etc. Its output can connect to various headphones, offering a versatile listening experience with support for most headphone models.
- Built-in Voltage Boost Circuit: adopting innovative circuit design with built-in voltage boost circuit, the amplifier circuit can always work at a high voltage of ±14V even only powered by DC 5V, and the background noise index is excellent. With wide frequency response extension, excellent transient response, excellent purity and transparency, and good dynamic range.
- Exceptional Output Power: for a total power output of up to 1500mW under a 32Ω load, U3 PRO can easily power headphones with any low or high impedance (18-600Ω). Working in class A status, with ultra-low distortion, the sound is warm and delicate, full and mellow with outstanding sound quality.
- Classic OP+BUF Architecture: U3 PRO adopts OP42 and BUF634, featuring a pure DC amplification circuit. Pluggable op amp socket design, OP42 can be replaced by OP17, AD797, AD843, AD847, and OPA627, convenient to upgrade different op amps and bring much DIY fun and playability for audiophiles.
- Highly Cost-Effective: mini size with exquisite appearance, brings big surprise for all audiophiles, easily to drive most headphones in the market, providing larger power, better sound field and details, very suitable for home/office desktop audio system use.
Sepefications
- Audio input: stereo L/R RCA, 3.5mm AUX
- Audio output: 3.5mm/6.35mm headphone jack
- Output power: ≥1500mW (32Ω)
- Matched headphone impedance: 18-600Ω
- Max output amplitude voltage: ±14V
- Frequency response: 20-30KHz
- SNR: ≥110DB
- Input voltage: DC 5V(≥1A)
- Dimension(W*D*H): 68*92*32mm/ 2.68*3.62*1.26in
- Net weight: 164g / 0.36lb
- Package weight: 300g / 0.66lb
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Great for running
Size: One Size, Color: (001) Black / Black / Reflective
Hat fits well and worked great for my marathon. The Velcro doesn’t pull on my hair.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 24, 2025
★★★★★ 5
Cute and comfortable, though a little big without tightening a bit
Size: One Size, Color: (100) White / White / Reflective
Love the bright color and material. It fits a little big at first but has the ability to tighten quite a bit so it should be fine like it is for me. I just have a smaller head. It has great coverage. Feels comfortable as well.
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Reviewed in the United States on January 7, 2026
★★★★★ 4
Perfect fit
Size: One Size, Color: (001) Black / Black / Reflective
I ordered this to wear during my upcoming vacation. It will shade my face from direct sunlight. I initially wished the brim was just a tad bit shorter but then I realize the current brim size will serve the purpose; that being the reason why it was purchased.
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Reviewed in the United States on June 24, 2025
★★★★★ 5
Buy it!
Size: One Size, Color: (001) Black / Black / Reflective, Size: One Size, Color: (001) Black / Black / Reflective
This hat (visor) is by far one of the most comfortable ones I’ve ever worn! Absolutely love it!!!!
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Underarmor
Size: One Size, Color: (001) Black / Black / Reflective
Me encanta todo lo de esta marca. Calidad
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
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