Douk Audio U3 Mini Class A Headphone Amplifier HiFi Desktop Stereo Amp

Douk Audio U3 Mini Class A Headphone Amplifier HiFi Desktop Stereo Amp for HD650/K701/DT880/T70/RS1e

$41.99

Features

Adopt Innovative Circuit Design
TI-NE5532 Classical Op Amp
Pluggable Op Amp Socket Design
Mini Size with Exquisite Appearance

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2-8 Days Arrival

30-Day Return

2-Year Warranty

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User Manual of Douk Audio U3

Warm tips:

Not inlcude power adapter, recommend to use original high-quality power adapter above 5W. For example: the current should be above 1A if use DC 5V while need above 0.5A if use DC 12V power adapter.

Adopting innovative circuit design, DC 5-20V wide input working voltage, the amplifier circuit can always work at a high voltage of 26V, and the background noise index is excellent. With wide frequency response extension, excellent transient response, excellent purity and transparency, and good dynamic range.
Adopting original TI-NE5532 classical op amp and transistor expanding current circuit, using 1300mA large current output transistor working in class A status, with ultra-low distortion, and the sound is warm and delicate, full and mellow.
Pluggable op amp socket design, convenient to upgrade different op amps and bring much DIY fun and playability for audiophiles. Smooth and mellow sound, suitable for listening to vocals or string music, classic or pop music, and even with unique charm when playing rock.
Mini size with exquisite appearance and most cost-effective, 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 desltop audio system use.
With stong drive power, easily to drive most high-impedance headphones such as:
HD580/HD600/HD650 K701/K702/Q701 DT880/T70/T90 SR225/SR325/RS1e

Audio input: stereo L/R RCA
Audio output: 6.35mm headphone jack (with 6.35mm to 3.5mm adapter)
Output power: ≥1300mW (32Ω)
Matched headphone impedance: 18-600Ω
Frequency response: 20-30KHz
Signal to noise ratio: ≥110DB
Max output amplitude voltage: 25V
Input voltage: DC 5-20V
Dimension(W*D*H): 67*93*30mm / 2.64*3.66*1.18in
Net weight: 169g / 0.37lb
Package weight: 310g / 0.68lb

U3 Headphone Amplifier ×1
USB to DC Cable ×1
6.35mm to 3.5mm Headphone Adapter ×1

Hear What They Say about the K5

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@Rick Ruiz Audio

Douk Audio T8 Pro - Is it better?

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@United States of Analog

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Douk T8 Vs Schiit Lokius - Both Winners!

Douk Audio U3
Mini Class A Headphone Amplifier

Versatile Headphone Support

26V high voltage for clear, noise-free audio with high-impedance headphones like HD580/HD600/HD650

Class A Amplification

Delivers a warm, detailed sound, enhancing the listening experience.

Easy Upgrades for Audiophiles

Customizable sound quality with the convenience of pluggable op amps.

Compact and Cost-Effective

Small size with powerful performance, an affordable choice for audio enthusiasts.

Small size makes it very portable and useful.

Analog inputs only. However the sound from my receiver and portable CD player is excellent. Purchased to drive my high impedance 250 ohm, headphones . Head phone outputs on many HiFi receivers, computers or phone DACs will not drive high impedance headphones properly. While they may be loud enough, the detail, depth, and bottom, isn't there. This head amp fixes the problem but needs at least a 2.4 or more power supply. I'm using 5v 3amps which does the job. The USB power plug connector needs to be twice as long as the one included.

Noisy and BAD

First, this thing DOES NOT COME WITH A POWER SUPPLY, at least not a serviceable one. The first page of their instructions tell you that you need to buy a separate power supply, which more than doubles the price of this item. Save yourself the time and money and buy a better amp that comes with a real power supply—it will end up being cheaper than this, and much much better quality. This thing is cheap trash.

Good, but...

Has great fidelity and even better gain. However after 6 weeks of Sunday Morning ONLY use at church, the headphone jack has become intermittent. Seems the Chinese do not know how to properly make a 1/4 inch phone jack. I have seen this happen in other China made audio gear. Too bad, I was hoping for more utility out of this product.

Great little amp.

Great little amp. While the write up did not mention it, I hook it up to the speakers on my desk top computer, so that I could listen to my favorite program while sitting in my recliner in the living room, instead of having to sit in my office chair in my office. Now I can be comfortable while enjoying the program. I can easily recommend this amp.

Punch and Fidelity at an Attractive Price Point

My use was to enhance the output of my MacBook Pro with Sennheiser 560 headphones. The MacBook can certainly drive these headphones but in my opinion does not get the most out of them. The level of detail and transients was much improved with the amp and provided a much more musical an enjoyable experience. Well worth the de minimis price for such an improvement. I ordered these cables to take the 1/8 output from the Macbook (https://www.amazon.com/dp/B077GRJ33V?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1) which were quite ergonomic with the l-shaped connector.

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