KEF R400b

By mounting two drivers back-to-back, the R400b cancels out the internal vibrations that typically cause cabinet resonance. This results in a tighter, faster, and more precise bass response that stays clean even at higher volumes.

It excels at both. Because of its sealed enclosure and high-agility drivers, it offers the speed and musicality needed for detailed stereo listening, while its dual 250W amplifiers provide the authority and depth required for demanding movie soundtracks.

Yes, the R400b is specifically designed for compact spaces. Its sealed, relatively small footprint allows it to deliver substantial low-frequency output without taking up the floor space of a traditional, ported subwoofer.

No, it features dual integrated Class-D amplifiers, meaning it is self-powered. You simply need to connect it to your receiver or pre-amplifier via the RCA input.

The R400b has a frequency response of 26Hz to 140Hz. This range covers the deep, resonant notes that add weight to music and the visceral impact needed for cinematic sound effects.