KEF R7

Features

3-Way Floorstanding Speaker: The KEF R Series R11 floorstanding loudspeaker utilizes a 3-way driver design that consists of a 12th Generation Uni-Q driver array with a 1" tweeter mounted in the center of a 5" midrange driver, plus two 6.5" low-frequency bass drivers for exceptional clarity, flawless precision, and superb dynamics.

12th Generation Uni-Q Driver Array: At the heart of the R Series loudspeaker is KEF's Uni-Q driver array. This signature innovation by KEF places the tweeter in the acoustic center of the mid-bass cone, with both drivers acting as a single point source. The R Series benefits from a new 12th generation Uni-Q Driver Array which has been extensively designed using KEF's in-house simulations and analysis tools. KEF's engineers have been able to dramatically reduces coloration through reducing resonance in the small gaps between the Uni-Q's separate elements. The resulting sound is purer and more precise with better stereo imaging.

• 1" Aluminum Dome Tweeter: At the center of the Uni-Q driver array is a 1" aluminum dome tweeter with KEF's tangerine waveguide to help disperse the higher frequencies evenly across a wider angle and flood the room with a natural soundfield. The tweeter's large neodymium magnet and a computer-optimized dome structure deliver articulate high frequencies with flawless precision. In addition venting the tweeter reduces pressure behind the dome, increasing midrange bandwidth and lowering distortion.
• 5" Aluminum Alloy Midrange: Surrounding the 1" aluminum dome tweeter is a 5" aluminum midrange driver. The R11's midrange response is amazingly fast and clean, thanks to the aluminum alloy cone, KEF's Z-flex surround smoothing the transition to the front-panel, and a sturdy die-cast aluminum chassis that prevents resonance from being transferred to the cabinet. In addition, large voice coils increase the driver's power handling and dynamics, reducing distortion and delivering exceptional vocal clarity.

Shadow Flare: Derived directly from KEF's Reference Series, the Shadow Flare is an innovative method of reducing harmful cabinet diffraction for delicate high-frequencies. Shadow Flare is a carefully profiled transition surface which extends the waveguide effect of the Uni-Q Driver Array. The tweeter no longer has line of sight of the cabinet edges, creating a "shadow region" at the points where the potential for diffraction is highest. The result is vastly improved fine detail, particularly when it comes to the subtle nuances of plucked strings and other percussive sounds.

Dual 6.5" Bass Woofers: The KEF R11 floorstanding speaker houses two 6.5" hybrid aluminum cone bass drivers. The R Series bass drivers have a two-part structure with a shallow concave aluminum skin atop a paper cone. Combine this stiffness with the cone's unique geometry and you get near pistonic movement for low-frequency punch and fast speed. KEF has also increased linearity in the magnet system which means more impressive and impactful bass.

Non-Resonant Cabinet w/ Flexible Port Technology: The KEF R Series speaker cabinet benefits from a constrained layer damping with internal bracing which is highly effective at dissipating unwanted vibrations that would otherwise artificially change the sound of the music. The speaker cabinet also utilizes a bass reflex design with dual rear-firing ports that feature innovative flexible walls. Using computational fluid dynamics (CFD) the flare and profile of each port is calculated to delay the onset of turbulence and the flexible port walls prevent resonances from coloring the midrange.

Note: Foam port plugs are included to insert into the rear-firing ports, if the bass is to "boomy" due to room placement.

Microfiber Grille: The KEF R Series loudspeaker comes with a microfiber grille that is hand-crafted and compressed with heated pressure from 13 layers of composite material. The R Series speaker is designed to sound its best with our without the grille installed. The microfiber grille magnetically attaches to the cabinet.

Dual Binding Posts: On the rear of the speaker cabinet are dual sets of heavy-duty, nickel-plated binding post terminals that will accept bare wire (up to 10AWG), pin-connectors, spade-lugs, and banana plugs (single only). Plastic inserts must be removed from the binding posts to use banana plugs. Using the dual sets of binding posts, you can bi-wire or bi-amp the speaker.

• Bi-Wiring: Bi-wiring can provide noticeable improvements in the overall transparency of your loudspeakers. Run separate speaker wires to the low & high/mid frequency drivers from a single amplifier (the upper set of binding posts are for the high frequency drivers; the lower set of binding posts are for the low frequency drivers).
• Bi-Amping: Bi-amping allows you to use separate amplifiers for the high/mid & low frequency sections of your loudspeaker for greater dynamic range & lower distortion. We recommend that your separate amplifiers have identical gain to preserve the speaker's voicing balance.

Note: Unlike many other speakers with dual binding posts, the R Series loudspeaker does not use jumper straps or leads between the high frequency and low frequency terminals. Instead there are two dials (labeled "Link") for the positive and negative high and low frequency terminals which can be adjusted to either connect the high and low frequency terminals together to power the speaker off a single amplifier channel (default setting) or disconnect the high and low frequency terminals from one another in order to bi-amp the high and low frequency drivers separately.

Outrigger Feet: The included outrigger feet provide a larger, more stable footprint with greater stability. The outrigger feet screw into the bottom of the speaker cabinet using the included hardware, while the include spikes screw directly into the bottom of the outrigger feet. The spikes are designed for carpeted flooring. Protective discs are also included to put under the spikes if placing the speaker on hardwood, tile, laminate, and vinyl flooring.

• Dimensions with Spikes: 12.25" (w) x 43.8125" (h) x 15.3125" (d)
• Dimensions with Discs: 12.25" (w) x 44.0" (h) x 15.3125" (d)

Note: The floorstanding peaker should always be used with the outrigger feet installed for maximum stability and optimum performance.

Placement Options: A pair of floorstanding speakers should be positioned 5' to 10' apart and form a equilateral triangle with the main listening position. They should be positioned at least 9" from the back wall due to their rear-firing port and 20" from side walls. The speakers can be "toed-in" or angled inward toward the main listening area to improve stereo imaging and soundstage.

Optional Powered Subwoofer: For even bigger and deep bass response, you can add one of KEF's powered subwoofers; such as the KF92 or one of their Kube Series powered subs (sold separately - see Accessories Tab).