KEF R400b (Gloss White)

KEF R400b in gloss white, 500W. Original packaging, manual.

Perfect complement to KEF LS50 or KEF LS50Wireless speakers, together approaching KEF Blade levels of precision, power and pristine clarity. Smart purchase with great synergy.

Retail: $1699

Asking: $775

- Absolutely beautiful and decor-friendly

- Among the most sophisticated and musical subs ever made

- Fewer than six months old

- Original owner

- Discounted to reflect a cosmetic issue (one lightly dinged corner) visible on close inspection

- In perfect working order (rich, deep, and stunningly fast force-canceling bass)

REVIEWS

“It’s not inexpensive, but there’s a lot of high technology packed inside this little subwoofer, and if you want to get both big bass and deep bass from a small cabinet, it’s only technology such as this that will get you there. But the other great thing about the KEF R400b (other than the great sound, the small size and the usefully-adjustable controls... particularly

that bass boost!) is that it really is a superbly stylish-looking subwoofer... so stylish that its very presence will enhance the décor of any room with modern furnishings.” – Australian Hi-Fi (review)

“With two opposing 9-inch active drivers in a sealed box, the R400b takes a decidedly musical approach to bass reproduction” – Sound & Vision (Top Picks Subwoofers)

“The R400b subwoofer, with its dramatic metal stripe running across the top and down the front, has two 9-inch drivers on either side of the enclosure—a design feature borrowed directly from the Blade tower. The opposing drivers both move outward or inward together, so that their vibrations cancel and don’t transfer to the cabinet. KEF uses an acoustic suspension enclosure—in other words, a sealed box—eliminating the port and any concomitant turbulence. While it’s possible to design a great-sounding woofer that gets some of its output from a port, the sealed-box approach provides a more disciplined feel that, in my opinion, serves music better and makes the low-frequency effects of action movies a little less aggressive and vulgar. Each aluminum driver is propelled by a 250-watt, Class D amplifier, for a total output-power rating of 500 watts. KEF provides stereo RCA line-level inputs and plug-in speaker-level inputs. In addition to the usual volume knob, crossover knob, and phase switch, there’s a three-setting bass boost (0, +6, +12 decibels) centered on 40 Hz. I was never less than satisfied with the zero setting. The R400b sub delivered the lower bass in just the kind of subtle, sealed-box fashion I prefer. – Sound & Vision (review)

“Its overall performance, including its lightning-fast response and tightly controlled grip, was always effective. The KEF R400b subwoofer’s agility and musicality should nicely complement the sound of high-quality speaker systems, and its modern look and small size will easily blend with the furnishings of fashionably decorated rooms -- not something that can be said of most subs.” – Soundstage Access

SPECS

Powered Subwoofer (Sealed)

2 x 225mm (9in.)

26Hz - 140Hz (-6dB)

111dB Max

2 x 250W (500W) built-in Class-D

40Hz - 140Hz, 4th-order variable low-pass filter

RCA phono sockets

Speaker level inputs

22 litres

100V - 120V / 220V - 240V ~ 50 / 60Hz

600VA

365 x 330 x 351 mm (14.4 x 13 x 13.8 in.) with terminal & plinth

21.5kg (47.4lbs)