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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
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4.9 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Great
Format: Paperback
Good book
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
★★★★★ 5
get it !!!
Format: Spiral-bound
10/10 recommend, helps me so much on breaking down nursing school things, asks questions as the chapters go on & gives you access online to practice questions it helps a lot. Also my professor pulls majority of the questions from here 😉
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Reviewed in the United States on December 29, 2025
★★★★★ 5
Preparing for the exam is essential.
Format: Paperback
A highly recommended book for nursing students preparing for the NCLEX exam is essential for effective study and exam readiness.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 14, 2026
★★★★★ 5
Recommendation
Format: Paperback
This book is comprehensive and very nice for any nursing students including those who are preparing for NCLEX exam.
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Reviewed in the United States on January 12, 2026
★★★★★ 5
As described
Format: Paperback
Came brand new, wrapped in plastic. Digital code included
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Reviewed in the United States on April 22, 2026
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