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AIAIAI UNIT-4 MKII, pair of black speakers with grilles, front view
  • AIAIAI UNIT-4 MKII, pair of black speakers with grilles, front view
  • AIAIAI UNIT-4 MKII, black pair on a studio desk with laptop and MPC
  • AIAIAI UNIT-4 MKII, black pair with grilles removed, woofer and tweeter
  • AIAIAI UNIT-4 MKII, black speaker, front view with LED ring
  • AIAIAI UNIT-4 MKII, black speaker placed horizontally
  • AIAIAI UNIT-4 MKII, black speaker rear panel with USB-C power, balanced and aux inputs
  • AIAIAI UNIT-4 MKII, black speaker, rear three-quarter view with carry handle
  • AIAIAI UNIT-4 MKII, black set with carrying case and X04 transmitter
  • AIAIAI UNIT-4 MKII, black X04 battery-powered W+ Link transmitter
  • AIAIAI UNIT-4 MKII, black speaker on a shelf next to a turntable
  • AIAIAI UNIT-4 MKII, black stereo pair with a laptop in a bar
  • AIAIAI UNIT-4 MKII, UNIT-4 carrying case, closed
  • AIAIAI UNIT-4 MKII, white pair with grilles removed
  • AIAIAI UNIT-4 MKII, white speaker rear panel with USB-C power port
  • AIAIAI UNIT-4 MKII, white speaker, rear three-quarter view
  • AIAIAI UNIT-4 MKII, white speaker placed horizontally
  • AIAIAI UNIT-4 MKII, white set with carrying case and X04 transmitter
  • AIAIAI UNIT-4 MKII, white X04 battery-powered W+ Link transmitter
  • AIAIAI UNIT-4 MKII, white speaker in a bicycle basket
  • AIAIAI UNIT-4 MKII, both speakers packed in the open carrying case outdoors
  • AIAIAI UNIT-4 MKII, official AIAIAI overview video
AIAIAI UNIT-4 MKII
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AIAIAI

AIAIAI UNIT-4 MKII

Active Nearfield Monitors
  • 2x 4" Woofers
  • Uncompressed W+ Link
  • 20 h Battery
2.676,00 zł / Pair
2.676,00 zł / Pair
VAT included • B2B ex VAT
i
ColorBlack
Coming soon · Available 2026-11

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AIAIAI UNIT-4 MKII 2.676,00 zł

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AIAIAI UNIT-4 MKII AIAIAI UNIT-4 MKIIThis item 2.676,00 zł
3.034,20 zł
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AIAIAI UNIT-4 MKII – Wireless Studio Monitors, Fully Portable

The AIAIAI UNIT-4 MKII is a pair of battery-powered 2-way monitors that stream uncompressed audio over W+ Link, charge over USB-C and pack into their own hard case. It is a near-field that tells you the truth about your mix on a desk, a sofa or a rehearsal-room floor, and at Soundium it sits as the most complete way to take a reference pair anywhere.

Key Features

  • Uncompressed W+ Link wireless: 44.1 kHz 16-bit audio at a fixed 16 ms, up to 12 m.
  • X04 transmitter with its own battery: plugs into grooveboxes, mixers and DJ gear with no USB host.
  • USB-C power: both speakers and the transmitter charge from standard USB-C supplies.
  • 20-hour battery: a 77 Wh cell per speaker, recharged in about 2 hours.
  • Bi-amped 2-way design: 4 inch paper cone woofer and 1 inch silk dome tweeter, 2 x 30 W.
  • Built to be repaired: glue-free chassis with replaceable batteries and driver units.

Customer Benefits

You get the same flat 50 Hz to 20 kHz reference you would expect from a wired desktop pair, without the cables that usually tie it to one room. Feed the X04 from a laptop, an MPC, a Digitakt or a mixer, set the speakers where the room sounds best, and keep working for a full day on battery. When it is time to move, both speakers, the transmitter and the leads go into one case, and one charger type brings everything back to full.

Quick Specs

  • Drivers: 4 inch paper cone woofer, 1 inch silk dome tweeter
  • Amplification: 2 x 30 W continuous, 2 x 80 W peak per speaker
  • Frequency response: 50 Hz – 20 kHz (±2 dB); 40 Hz – 40 kHz (-10 dB)
  • Peak SPL: 105 dB
  • Wireless: W+ Link (16 ms, uncompressed 44.1 kHz 16-bit, 12 m), Bluetooth 5.2
  • Inputs: 3.5 mm mini-jack, 6.3 mm TRS balanced
  • Battery and power: 77 Wh, 20 h playback, 2 h charge, USB-C
  • Size and weight: 156 x 258 x 114 mm, 2.54 kg per speaker

In the Box

  • 2 x UNIT-4 MKII speakers
  • 2 x UNIT-4 USB-C power supplies
  • 1 x X04 W+ Link transmitter
  • 1 x UNIT-4 carrying case

Use Cases / Ideal For

  • Mobile producers working from a laptop or groovebox
  • DJs practising away from the booth
  • Small rooms and shared spaces where cables are a problem

Compatibility

Connect over W+ Link via the X04 transmitter, over Bluetooth 5.2, or wired through 3.5 mm or balanced 6.3 mm TRS, with 3/8 inch threads for standard mic stands.

Pros & Cons

✅ Pros:

  • Uncompressed low-latency wireless that Bluetooth monitors cannot match
  • Battery-powered X04 transmitter works with standalone hardware
  • USB-C charging and an included hard case make it genuinely portable
  • Repairable design with replaceable batteries and drivers

⚠️ Cons:

  • 4 inch woofers limit low-end weight and level in larger rooms
  • App EQ only, no room correction

The UNIT-4 MKII is the version of AIAIAI's wireless monitor that finally travels as lightly as it sounds: reference tuning, uncompressed wireless and a full day on battery in one case. Choose black or white, and find it at Soundium with support from people who use this gear.
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