What do buyers say about the Douk Audio U3 Mini Class A Headphone Amplifier?

Rated 4.1 out of 5 from 21 ratings. Buyers like: Great fidelity and even better gain; Small size makes it very portable and useful; Excellent sound from receiver and portable CD player. Common complaints: Noisy unless run on 16-18 volts DC; Does not come with a serviceable power supply; a separate power supply more than doubles the price.

Where can I buy the Douk Audio U3 Mini Class A Headphone Amplifier?

2 stores we checked sell it, including Douk Audio, Amazon.

Douk Audio U3 Mini Class A Headphone Price History: Lowest $36.99

Q: Where is the Douk Audio U3 Mini Class A Headphone Amplifier cheapest?

At Douk Audio, for $36.99, as of our latest check.

What reviewers say

4.1 / 521 ratings

From Douk Audio

Innovative circuit design with DC 5-20V wide input voltage; amplifier circuit works at a high 26V
Original TI-NE5532 classical op amp with transistor expanding current circuit
1300mA large current output transistor working in class A status
Pluggable op amp socket design for upgrading op amps and DIY fun
Mini size with exquisite appearance; easily drives most headphones
Strong drive power for high-impedance headphones such as HD580/HD600/HD650, K701/K702/Q701, DT880/T70/T90, SR225/SR325/RS1e

Guarantee: 2-Year Warranty
Returns: 30-Day Return
Shipping: Free Shipping, 2-8 Days Arrival
In the box: U3 Headphone Amplifier ×1, USB to DC Cable ×1, 6.35mm to 3.5mm Headphone Adapter ×1

About the Douk Audio U3 Mini Class A Headphone Amplifier

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.

Features

• 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

Parameters:

• 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

Packing List

What buyers say

Buyers like

Great fidelity and even better gain
Small size makes it very portable and useful
Excellent sound from receiver and portable CD player
Fixes the problem of driving high-impedance headphones properly
Great if run on 16-18 volts DC

Buyers complain about

Noisy unless run on 16-18 volts DC
Does not come with a serviceable power supply; a separate power supply more than doubles the price
Audible electrical hissing
Channels mismatched on the unit received
Stepped volume knob feels cheap and scratchy
Headphone jack became intermittent after 6 weeks of light use