KEF Kube 10 MIE, active sealed-enclosure subwoofer with a 250 mm driver and a 300 W RMS Class D amplifier. It reaches down to 24 Hz for a maximum output of 111 dB.

A port lets the bass trail behind the signal. The Kube 10 MIE does without one: the driver works inside a sealed cabinet, the trapped air acts as a spring and pulls it back into position as soon as the signal stops. Output stops at 24 Hz at ±3 dB, a touch higher than a bass-reflex model of the same size, but every bass note starts and ends when the score says so.
The 250 mm (10-inch) cone is driven by a 300 W RMS Class D amplifier, which keeps it under control up to a maximum output of 111 dB. That headroom matters less for loudness than for what happens below it: at normal listening levels, the amplifier never strains.
A subwoofer in a corner resonates even more, one in the middle of a wall disappears. The Kube 10 MIE's MIE processor corrects for what the room adds: three placement settings (furniture, wall, corner), a low-pass filter adjustable from 40 to 140 Hz and an LFE mode, all accessible from the rear panel.
Two RCA line inputs and one speaker-level input cover both the built-in amp and a home-cinema processor. An extension connector accepts the KW1 wireless kit, sold separately, when running a cable to the subwoofer isn't practical. The cabinet measures 370 × 353 × 370 mm for 15.4 kg — a compact cube for an ordinary living room.
Data sheet
Specific References
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