Kef

Kef R11 Floorstanding Speakers

£3,979 £3,999

Stock Availability : Only 1 left in stock.

Decades of experience and Kef's unbridled passion for music come together in the new R Series. It combines innovations drawn from the Reference Series with new bespoke technologies to ensure the new R Series delivers more detail, deeper insight and greater excitement.

The largest model in the R Series the Kef R11 combines four hybrid aluminium bass drivers and a 12th generation Uni-Q for mid and treble the mighty R11is extremely capable. Using technology from KEF Reference it delivers clarity, finesse and serious bass.

For starters, Uni-Q’s midrange motor system has been completely redesigned using KEF’s in-house simulation and analysis tools as well as decades of experience. The motor is responsible for converting the audio signal from an electrical voltage to a mechanical force. Ideally it does this without any loss and without introducing any distortion. For a midrange driver, significant distortion can be generated due to modulation of the voice coil inductance. The motor in the new R Series has a shaped and undercut pole, and symmetrical aluminium demodulation rings, which combine to significantly reduce the inductance in the lower midrange so there is less variation as the voice coil moves.

To maximise bass performance in the new R Series, the dedicated low-frequency drivers are built using a two-part structure, where a shallow concave aluminium skin sits atop a paper cone. This stiffness combined with the cone’s unique geometry reduces additional resonances and delivers the pistonic movement that makes these drivers time so well.

The new drivers also benefit from a completely redesigned magnet system that creates a more even magnetic field, and a design of suspension that reduces harmonic distortion for a cleaner, more precise sound.

The result is tight, agile bass that digs out all the soul and punch available in the low end.

Cabinet Bracing

A solid platform is imperative for great sound. The new R Series benefits from Constrained layer damping. This system utilises internal braces joined by a ‘lossy’ interface and is highly effective at dissipating unwanted vibrations that would otherwise artificially change the sound and music. Originally developed for the multiple award-winning LS50, this system utilises internal braces joined to the panels by a lossy interface rather than being adhered to it rigidly. This approach is highly effective at dissipating unwanted vibrations. A new internal bracing layout works alongside Constrained Layer Damping to create an incredibly inert platform from which the drive units can work their magic, enabling the R Series to deliver music as it is supposed to sound, without any unwanted extras....

Specifications...

DESIGN

Three-way bass reflex

 

DRIVE UNITS

Uni-Q Driver Array:
HF: 25mm (1in.) vented aluminium dome
MF: 125mm (5in.) aluminium cone
Bass Driver:
LF: 4x 165mm (6.5in.) hybrid aluminium


WEIGHT

37.7 kg (83.1 lbs.)
 
 

DIMENSION (H X W X D)

1249 x 200 x 383.5 mm (49.2 x 7.9 x 15.1 in.) with terminal*
 
 

DIMENSION (H X W X D)

1295.5 x 310.6 x 383.5 mm (51 x 12.2 x 15.1 in.) with terminal with Plinth*
 
 

SENSITIVITY

(2.83V/1m) 90dB

 

CROSSOVER FREQUENCIES

400Hz, 2.9kHz

 

FREQUENCY RANGE

30Hz-50kHz (-6dB)

 

TYPICAL IN-ROOM BASS RESPONSE

26Hz (-6dB)
 
 

FREQUENCY RESPONSE

46Hz-28kHz (±3dB)
 
 

HARMONIC DISTORTION

<0.3% 120Hz-20kHz (90dB, 1m)
 
 

MAXIMUM OUTPUT

113dB
 

AMPLIFIER POWER

15-300W (recommended)
 
 

NOMINAL IMPEDANCE

8Ohms (min.3.2Ohms)
 
 

FINISHES

Black Gloss / White Gloss / Walnut

We are in the process of updating our Doug Brady Hi Fi website, which now provides you with automatic real-time stock updates. .

When viewing a product listing page, click on the option/colour of the product you require then you'll see one of the following stock indicators.

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In Stock - Order Now - Delivered free to you on [delivery-date] 

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Our shop stock will be dispatched on the date displayed on the product page, delivery will be booked for the delivery date displayed. We will send you a DPD tracking number where you will be given a 1 hour time slot on the day of delivery. 

 

In Stock - 2-3 day Dispatch - Delivered to you FREE by  [delivery-date] 

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Stock being dispatched from our off site warehouse may take a day or two longer for you to receive. We may also dispatched directly from the manufacturer or distributor. This is often the case for particularly large or heavy items where specialized service is required. For anything which can take time to get to you, we'll contact you quickly.

Available to Order - ☎ - 01925 828009

Availably to order. Occasionally, due to stock demand, we can sell out. We either have this on order with stock due in or we do not usually have back up stock of this item in store. When you make a purchase, we will inform you quickly when the item is due in from the manufacturer and deliver as soon as it arrives with us. Usually this is only a short wait of 3 - 5 days, we will contact you with a estimated delivery time.

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This item is currently sold out with the supplier or manufacturer please call us so we can give you an estimated time. 01925 828009 

Available*

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In Stock - Free Next Day Delivery*

Platinum Jubilee 2022 Bank Holiday Delivery Schedule

DPD

Ordered (pre-3pm) Expected Delivery Extra Information
Tuesday 31st May

Wednesday 1st June

 

Wednesday 1st June Saturday 4th or Sunday 5th June (if requested) If next day delivery is selected then delivery will be made on Tuesday 7th June.

Free next working day delivery when you spend over £75. We will send you a tracking number where DPD will give a one hour delivery window. Services available Monday to Friday (excluding public holidays) to most mainland UK addresses for in stock items ordered before our cut-off time at 3pm. Terms apply.

Free Saturday delivery when you spend over £500. We will send you a tracking number where DPD will give a one hour delivery window. Services available to most mainland UK addresses for in stock items ordered before our cut-off time on Friday 3pm. Terms apply.

* Excludes CLICK & COLLECT items  Some of our manufactures request for there items not to be sold on line for these items our delivery service may not be available in curtain locations so please call to order 01925 828009

Delivery Costs

Standard next day delivery is free for all orders to most UK mainland addresses. All other delivery prices are determined by the destination, the service chosen and the value and weight of your order. Addresses in the Scottish Highlands, offshore, Northern Ireland & Ireland may incur additional delivery costs, depending on the items ordered.

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