KEF M400 On-Ear Headphones


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Pre-Order now! Available June

KEF design, engineer and manufacture some of the most impressive loudspeakers in the world, offering a level of dynamic thickness, tempered with glorious and beautiful higher frequencies and exceptional clarity that many lesser brands strive to achieve. KEF bring this philosophy of high quality audio reproduction from their loudspeakers and have integrated similar and equally innovative technology into their headphone models.

Following the success of the M200 and M500 models, KEF have designed and developed two accompanying headphone sets, the M100 and M400. As with any KEF product, the M400 features a beautiful aesthetic design reflecting the impacting level of superior sound quality within. Thanks to exceptionally light 40mm neodymium drivers and high quality copper clad aluminium wire voice coil, the M400 is capable of reproducing a sound that's unbeatable close to the original performance, complete with every crisp high and dynamic low.

They're brilliantly lightweight but are able to withstand a bump or two, designed for years of use on-the-move or at home. The hinges of the folding frame are practically invisible, and the frame itself has been engineered from precision-machined cast aluminium. The ear-pads consist of a supremely supra-aural (on-ear) memory-foam padding. This memory foam padding creates a seal around your ear, to give a superior level of noise filtration that many other on-ear headphone designs are simply not capable of offering. 


 Driver 40mm 
 Frequency Response 20Hz~20kHz 
 Sensitivity 101.5dB±4dB
(IEC-318 at 1KHz) 
Impedance  32±15%Ohm 
Maximum Input Power  30mW 
 Noise Attenuation  -20dB
 Cable Length 1.3m 
 Connector 3.5/3.5mm 
 Weight 175g 

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Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25