Features
- Enhanced Compatibility: U3 adopts simple RCA input and 6.35mm headphone output, while U3 PRO is upgraded with 3.5mm AUX/stereo RCA input and 3.5mm/6.35mm headphone output, compatible with more audio sources, including MP3 players, iPods, phones, tablets, computers, and CD players etc., and more headphone models as well.
- Built-in Voltage Boost Circuit: U3 PRO adopting innovative circuit design with built-in voltage boost circuit, the amplifier circuit can work at a higher voltage of ±14V, and the background noise index is excellent. With wide frequency response extension, excellent transient response, purity and transparency, and good dynamic range.
- Exceptional Output Power: for a total power output of up to 1300mW(U3) and 1500mW(U3 PRO) under a 32Ω load, both 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 Amp Architecture: U3 adopts NE5532, and U3 PRO adopts OP42 and BUF634, featuring a pure DC amplification circuit. Pluggable op amp socket design, 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.
Warm tips:
1. U3 PRO won't work well if the current of power adapter is below 1A. For U3, 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.
2. U3 PRO's 3.5mm and 6.35mm headphone jack can output at the same time. Please don't use RCA and AUX input at the same time, otherwise audio mixing will be caused.
Parameters:
|
Model |
U3 |
U3 PRO |
|
Audio input |
stereo L/R RCA |
stereo L/R RCA, 3.5mm AUX |
|
Audio output |
6.35mm headphone jack (with 6.35mm to 3.5mm adapter) |
3.5mm/6.35mm headphone jack |
|
Output power |
≥1300mW (32Ω) |
≥1500mW (32Ω) |
|
Matched headphone impedance |
18-600Ω |
|
|
Op amp |
NE5532 |
OP42 |
|
Frequency response |
20-30KHz |
|
|
Signal to noise ratio |
≥110DB |
|
|
Max output amplitude voltage |
26V |
±14V |
|
Input voltage |
DC 5-20V (≥5W) |
DC 5V (≥1A) |
|
Dimension(W*D*H) |
67*93*30mm/ 2.64*3.66*1.18in |
68*92*32mm/ 2.68*3.62*1.26in |
|
Net weight |
169g / 0.37lb |
164g / 0.36lb |
|
Package weight |
310g / 0.68lb |
300g / 0.66lb |
Packing list
- 1* U3/U3 PRO headphone amplifier (optional)
- 1* DC 5V Power Adapter
- 1* 6.35mm to 3.5mm headphone adapter (only for U3 version)
