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Douk Audio U5PRO HiFi Fully Balanced Headphone Amplifier for XLR and 4.4mm Headsets Review

A fully balanced desktop headphone amp that runs its output stage at ±14V from a plain DC 5V supply, delivering up to 1500mW into 32 ohms. XLR inputs feed XLR or 4.4mm balanced outputs for 18-600 ohm headphones.

3.63.6 out of 5 starsUpdated October 14, 2026
$79.99Price checked October 14, 2026
Check price at Douk Audio
Douk Audio U5PRO HiFi Fully Balanced Headphone Amplifier for XLR and 4.4mm Headsets

Our verdict

The U5PRO is a specialist's tool at $79.99: a genuinely balanced headphone amp with a ±14V output stage, 1500mW of power and op-amp rolling in a tiny chassis. If your source and headphones are properly balanced and you feed it a clean 5V supply, it delivers serious drive for the money. Single-ended sources and unbalanced headphones are the wrong fit - this one wants the full balanced chain.

Best for
Listeners with balanced headphones and a balanced source who want maximum drive from a tiny, affordable amp.
Skip if
Your source or headphones are single-ended - the U5PRO is built for a fully balanced chain.
Check price at Douk AudioHow we research

The Douk Audio U5PRO is a fully balanced headphone amplifier priced at $79.99, built for XLR and 4.4mm balanced headset setups. Its mini chassis hides a fully balanced amplifier circuit and a built-in voltage booster that keeps the amplifier running at ±14V internally, even from a DC 5V supply.

Total power output reaches up to 1500mW under a 32-ohm load, which the maker says can easily power headphones of any low or high impedance from 18-600 ohms. The circuit uses classic OP+BUF architecture with OP42 and BUF634 chips in a pure DC amplification circuit, and it is laid out as four independent paths for what Douk Audio calls exceptional sound quality across sound field, positioning and detail. The volume knob adjusts smoothly without undesirable noise or channel imbalance.

Connectivity is balanced end to end: stereo L/R XLR (3-core, female) inputs and XLR (4-core, female) plus 4.4mm outputs. The OP42 op-amp sits in a pluggable socket and can be swapped for OP17, AD797, AD843, AD847 or OPA627 to change the sound character. Two requirements matter before buying: single-ended or fake-balanced input signals may not work properly (add the Douk Audio U1 adapter for single-ended sources), and the headphones themselves must be balanced with L+/L- R+/R- wiring. Power comes from your own DC 5V supply of at least 1A, such as a USB phone charger; anything over 5V will damage the unit.

Douk Audio ships worldwide with free and expedited shipping options at varying cost by country. Packages under 2kg travel by airmail in roughly 10-25 days, while orders over 2kg ship via DHL/UPS/FedEx in about 5-8 days, and any import duties or customs charges are the customer's responsibility. Returns are free within 30 days for a full refund, and every item carries a 1-year warranty. Exclusions cover orders placed by mistake, man-made damage or misuse, a change of mind, and anything outside the warranty terms.

What we liked

  • Fully balanced amplifier circuit runs at a high internal voltage of ±14V, even from a DC 5V feed
  • Total output of up to 1500mW at 32 ohms, driving low- and high-impedance headphones from 18-600 ohms
  • Classic OP+BUF architecture with OP42 and BUF634, plus a pure DC amplification circuit over four independent paths
  • Pluggable op-amp socket accepts OP17, AD797, AD843, AD847 or OPA627 replacements
  • Smooth volume adjustment without noise or channel imbalance in a mini chassis

Worth noting

  • Designed around balanced input: single-ended or fake-balanced sources (such as a 3.5mm-to-XLR cable) may not work properly without Douk Audio's U1 single-ended-to-balanced adapter
  • Headphones must be balanced, with L+/L- R+/R- interface definition, to work correctly
  • No DC 5V power adapter included - use a USB charger rated 5V at 1A or more; input over 5V will damage the unit

Questions before you buy

Can I use single-ended sources with it?

Not directly - the maker warns it may not work normally with single-ended or fake-balanced signals. Add the Douk Audio U1 single-ended-to-balanced adapter between the audio source and the U5PRO.

What headphones are compatible?

Balanced headphones with L+/L- R+/R- interface definition, from 18-600 ohms; the amp delivers up to 1500mW at 32 ohms.

Does it come with a power supply?

No - it needs a DC 5V supply of at least 1A, such as a USB phone charger. Input voltage over 5V will damage the unit.

Can I change the op-amp?

Yes - the OP42 sits in a pluggable socket and can be replaced with OP17, AD797, AD843, AD847 or OPA627.

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