KEF Kube 15 MIE active subwoofer

KEF Kube 15 MIE active subwoofer

15-inch forward-firing active subwoofer

The Kube 15 MIE, the largest model in the Kube series, is designed to deliver the deepest bass for music and movies, delivering an earth-shaking bass experience. Perfect for large rooms, the 15-inch woofer and 300W (RMS) Class D amplifier combine to deliver the most powerful bass performance in the series. Powered by Music Integrity Engine® technology, the Kube 15 MIE is optimized to deliver exceptional depth and dynamics.

Music Integrity Engine® (MIE)

KEF's proprietary DSP (Digital Signal Processing) algorithm ensures that all the subwoofer's components work in perfect harmony, while iBX Intelligent Bass Extension delivers deeper, more precise bass.

Feel the power of music!

The Kube features a forward-firing, long-throw woofer with a wide cone area and high excursion, delivering higher output at low frequencies. Its powerful and cool-running 300W Class D RMS amplifier further enhances performance.

Make an impact in a new way!

A great addition for example: watching movies and TV, listening to music and also playing games in large rooms and in your own home theaters. Well suited for rooms of 15 - 70m².

Enjoy bass effortlessly without wires with the KW1 adapter, sold separately!

The KW1 allows for optimal placement of the Kube even wirelessly. The high-quality wireless signal ensures that all the nuances and effects of your favorite movies and music are accurately reproduced.

Kube offers a variety of connectivity options, including KEF SmartConnect and speaker level inputs, making it easy to connect to any system.

Three different EQ options for rooms

Easy presets ensure Kube performs excellently regardless of its location.

Flexible power saving settings

“Auto wake up” detects audio signals in standby mode, “Always on” mode keeps it constantly ready for use, and the “12V trigger” feature enables automatic wake-up with compatible amplifiers.

Specifications:

• Bass drivers: 1 x 380mm (15in.)

• Amplifier: 300W RMS Class-D

• Frequency response: 20Hz - 140Hz (±3dB)

• Maximum sound pressure 116 dB

• Inputs RCA and speaker level input

• Recommended room size 15 – 70m²

• Case dimensions (H x W x D): 519 x 500 x 515 mm

• Weight: 27.5 kg

Wireless connection to the KEF XIO soundbar

The KEF Kube 15 MIE subwoofer can connect wirelessly to the KEF XIO soundbar using a KEF KW2 RX receiver, sold separately. The receiver plugs into the subwoofer's expansion port. The transmitter is built into XIO.

• XIO supports up to two wireless subwoofers simultaneously. Each subwoofer requires its own KW2 RX receiver.
• With the firmware update released in November 2026, the same system can also use a pair of LSX II, LSX II LT or Coda W speakers as rear speakers. One additional KW2 RX is sufficient for the entire rear speaker pair.
• A rear speaker pair and two wireless subwoofers require three KW2 RX receivers in total.

Setup is handled in the KEF Connect app. Update XIO, its transmitter, the KW2 receivers and any rear speakers to the latest firmware. The XIO surround system requires a working home Wi-Fi network. Audio is transmitted wirelessly, but the subwoofer still needs a mains connection.

Use KW2 RX for the XIO connection. For wireless subwoofer connections in other audio systems, the KW1 Adapter Kit provides a transmitter and receiver.

The XIO soundbar, KW2 RX receivers and rear speakers are sold separately. See KEF's surround system setup guide (PDF).