Skip to product information
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
Forthcoming
Pre-order & save 5% with code EARLY5 — ships soon.
AIAIAI

AIAIAI UNIT-4 MKII

Active Nearfield Monitors
  • 2x 4" Woofers
  • Uncompressed W+ Link
  • 20 h Battery
3.224,66 lei / Pair
3.224,66 lei / Pair
VAT included • B2B ex VAT
i
ColorBlack
Coming soon · Available 2026-11

Get notified at launch

This one's coming soon. Leave your email and we'll let you know the moment it's available to order — you'll be among the first. Got a question or a special request? Drop it below.

AIAIAI UNIT-4 MKII 3.224,66 lei

No spam — we'll only use this to follow up on your request.
Pay in installments Klarna
  • 3 × 1.074,88 lei Interest-free · 18+, T&C apply
Buy in installments
Bundle dealSave 10%

Complete your setup

Pick your add-ons — get 10% off the extras when bought together.

AIAIAI UNIT-4 MKII AIAIAI UNIT-4 MKIIThis item 3.224,66 lei
3.655,86 lei
Free shipping
Free delivery over €149, or €4 to a pickup point. We ship it as soon as it arrives — expected 2026-11. Learn more
30-day returns
Not the right fit? Return within 30 days for a full refund. Learn more
3-year warranty
Every product includes a standard manufacturer warranty. Extend your warranty
Price match
Found it cheaper elsewhere? We'll match the price. Learn more
Vincas Need advice?Our experts are here We usually answer the hotline 10:00–18:00 (lunch 13:30–14:30). If we miss you — sorry, we're human. For simple questions we usually reply within a couple of hours.

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.
Compare
Reviews
You may also like