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Douk Audio U5 Mini Fully Balanced Headphone Amplifier for XLR and 4.4mm Headsets Review

A mini fully balanced headphone amplifier that runs its circuit at 24V from a 5V input, delivering 1400mW into 32 ohms for headphones from 18 to 600 ohms, with XLR and 4.4mm outputs.

3.73.7 out of 5 starsUpdated October 14, 2026
$52.99Price checked October 14, 2026
Check price at Douk Audio
Douk Audio U5 Mini Fully Balanced Headphone Amplifier for XLR and 4.4mm Headsets

Our verdict

The Douk Audio U5 is a compact balanced headphone amp for $52.99 that covers a lot of ground: a fully balanced circuit running at 24V internally, at least 1400mW into 32 ohms for 18-600 ohm headphones, and both 4-core XLR and 4.4mm balanced outputs. The pluggable JRC4580 op-amp invites upgrades. Bring your own 5V supply and an XLR source, and it is a serious little desktop amp.

Best for
Owners of XLR or 4.4mm balanced headphones who want a small, affordable balanced desktop amp with op-amp rolling potential
Skip if
Your source only has RCA outputs, or you expect a power adapter in the box — the U5 ships without one and needs strictly 5V DC
Check price at Douk AudioHow we research

The Douk Audio U5 is a mini fully balanced headphone amplifier priced at $52.99. It uses a fully balanced amplifier circuit with an innovative design that keeps the amplifier stage working at a high 24V even when fed a DC 5V input, resulting in wide frequency response extension, excellent transient response and a good dynamic range.

Power output reaches a total of 1400mW under a 32 ohm load, which the maker says makes it capable of driving headphones at any low or high impedance from 18 to 600 ohms. The volume knob adjusts smoothly without undesirable noise or channel imbalance. The design is pure analog — analog amplification and analog control — which the maker presents as reproducing the truest sound, with top-class performance in sound field, positioning and detail.

Connections are balanced end to end: stereo L/R XLR (3-core, female) input and selectable 4-core XLR female or 4.4mm outputs, ideal for XLR and 4.4mm headphone cables. The op-amp is an original JRC4580 in a pluggable socket, so different op-amps can be rolled in for other sound styles. The published specs include a 20-30KHz frequency response, SNR of at least 110dB and 0.005% THD, all in a 68x69x28mm chassis weighing 149g, with a USB-to-DC cable included.

Two practical notes: there is no DC 5V power adapter in the box, so plan to use your own charger — the maker recommends a supply of 1A or more, and warns that input over 5V will result in damage. And because the input is XLR only, single-ended RCA sources will need an adapter or converter.

Shipping is worldwide with free and expedited options, and cost varies by country. This amp is light, so it ships airmail in an estimated 10-25 days unless expedited service is chosen. Import duties and customs fees are the customer's responsibility. Free 30-day returns with a full refund and a 1-year warranty apply to all items, excluding orders placed by mistake, man-made damage or misuse, subjective change of mind, and anything else outside the warranty terms.

What we liked

  • Fully balanced circuit with its own innovative design keeps the amplifier stage at 24V even from a DC 5V input, for wide frequency extension and excellent transient response
  • At least 1400mW into 32 ohms easily drives headphones of any impedance from 18 to 600 ohms
  • Balanced XLR and 4.4mm outputs cover modern balanced headphone cables without adapters
  • Pure analog amplification and analog control aim at a truthful sound with strong soundstage and detail
  • The pluggable JRC4580 op-amp can be rolled for a different flavor, and the volume knob adjusts smoothly without channel imbalance

Worth noting

  • No DC 5V power adapter is included — the maker notes you can use your own phone charger
  • The input is stereo XLR only, so single-ended RCA sources need a converter or adapter
  • Input voltage over 5V will damage the amp, so the power supply must be strictly 5V

Questions before you buy

What headphones can the U5 drive?

It outputs at least 1400mW at 32 ohms and matches headphones from 18 to 600 ohms, covering both sensitive and demanding models.

What power supply does it need?

A DC 5V supply of 1A or more, such as a phone charger — no power adapter is included. Input over 5V will result in damage, so use a dedicated 5V charger.

Can I change the op-amp?

Yes. The U5 uses an original JRC4580 classical op-amp in a pluggable socket, making it convenient to upgrade to different op-amps for other sound styles.

What are the shipping and warranty terms?

Worldwide shipping with free and expedited options; light orders ship airmail in about 10-25 days. Import duties are the customer's responsibility. Free 30-day returns for a full refund and a 1-year warranty apply, excluding orders by mistake, misuse, change of mind and anything outside the warranty terms.

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