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Denon AH-MM400 Over-Ear Headphones

Denon AH-MM400 Over-Ear Headphones

Discover a whole new world of musical enjoyment with Denon's AH-MM400 reference class headphones. Professionally tuned for a flat EQ and deliver a natural tonal balance that's faithful to the original musical performance.

EAN: 4951035054659

Man. Part No.: AH-MM400

Denon AH-MM400 Over-Ear Headphones

Denon AH-MM400 Over-Ear Headphones


Reference Quality Over-Ear Headphone

Discover a whole new world of musical enjoyment with Denon's AH-MM400 reference class headphones, which are professionally tuned for a flat EQ and deliver a natural tonal balance that's faithful to the original musical performance.


Natural American Walnut Earcups

Featuring hand-carved natural American Walnut earcup housings, the AH-MM400 delivers a superb musical experience, with balanced tonal quality thanks to the resonance-free natural wood housings. A comfortable over-ear (circumaural) design, the AH-MM400 provides a high degree of passive acoustic isolation, letting you listen to your favorite tracks without distracting background noise interference.


Aluminum Die-cast Hangers

The earcup housings connect to the lightweight adjustable headband via aluminum alloy die-cast hangers that feature resonance-free construction, along with high rigidity for maximum durability. The AH-MM400 also features collapsible earcups for storage in the supplied carrying pouch.


40mm Carbon/Paper Composite - Diaphragms with Free Edge and Neodymium Magnets

The AH-MM400 features proprietary 40mm drivers with advanced Carbon/Paper composite blend diaphragms and neodymium magnets along with Denon's exclusive Free Edge technology, which dispenses with the traditional diaphragm surround suspension to deliver extended frequency response all the way up to 40 kHz.

Contemporary European Design

Designed to look as good as they sound, the AH-MM400 features a fresh European style-inspired design that combines classic styling with a modern touch.

Oxygen Free Copper Cables

For the utmost audio fidelity, the AH-MM400 comes with 2 detachable audio cables, both featuring high purity Oxygen Free Copper (OFC) cable technology. One cable features a built-in microphone along with a remote control for volume, track selection and smartphone control. The other longer cable is provided for connection to other devices, and both cables feature gold-plated connectors.


Included Accessories:

- Carrying pouch
- Detachable OFC cable with remote and microphone
- Detachable OFC analog audio cable
- 6.3mm/¼" plug adapter

Additional Information

Promotion No
Manufacturer's Part No. AH-MM400
EAN 4951035054659
Amplifier Award No
awards No
Warranty 2
Max Amplifier Power No
Wireless No
In-Built Microphone No
Headphone Type Around-Ear

Finance options* to help you afford the product you want!

If your order value is £389.00 or over you will be given the option to buy on finance when you reach the checkout. We have two finance options available:

Buy Now Pay 6 Months Later
Buy Now Pay 12 Months Later


Please Note: A minimum 10% deposit is payable up front on credit or debit card on all finance orders.

How to Apply

Applying for finance is simple. All you need to do is call us on 0800 634 4484 during opening hours and we will be able to process your order.

Who is the finance agreement with?

The finance agreement is with Hitachi Consumer Credit, one of the largest money lenders in the UK.

*Finance is available to UK applicants 18 years of age or older and subject to status. Finance is not available for business customers. Prices are correct at time of going to press and are subject to change during the term of this offer without notice. Terms and conditions are available on request. Finance agreements are available on orders between  £389 and £10,000 (including VAT and shipping). Please ensure you are able to keep up repayments of any finance package taken.

Now Group UK Ltd trading as Exceptional AV operates under a Consumer Credit Licence, No. 560813.
This licence is issued by The Director General of Fair Trading at the Office of Fair Trading in accordance with the Consumer Credit Act 1974.

Denon AH-MM400 Over-Ear Headphones

Availability: Usually dispatched

£249.00 inc vat


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Up to 90 Day Returns!

Returns are easy and flexible. We will accept returned goods up to 90 days from purchase with the following restrictions as summarised below. For more details please read our Terms & Conditions of Sale, a link is shown at the bottom of the home page.

Changing your Mind
It's OK to change your mind but please be aware that all goods must be returned in as new, unused and re-saleable condition. This means that all packaging must be intact, all accessories are complete in their original wrappers and any free items are also returned with the goods. Essentially the product must be returned in the same condition as you would expect to receive a new unit in. In all cases the cost of returning the goods will be the customer's responsibility. All faulty items must be returned complete and will be repaired under the manufacturer's warranty.


How we Handle Returns
Depending on how long you have had the goods there are different options availble to you. In the case of faulty items, if the item fails due to a manufacturing fault between 1 and 28 days from delivery we will exchange it for a brand new one of the same model. Any items which are found faulty after 28 days from delivery will be repaired under the manufacturers warranty. For returns where you have changed your mind, please find our policy below:


This is were you return your item and we will exchange it for another item of equal or higher value. If the item you wish to change to is of higher value you only pay the difference. If the item is of a lower value we will issue you with a credit note for the difference which you can spend with us at a later date.

Credit Note
This is where you return your item and we issue you with a credit note which you can use against another purchase with us.

This is where you return your item and we issue a refund back to the same method you paid with. e.g. the same credit card. This is not available after 14 days, only exchange or credit note is available after 14 days.

25% Restocking Fee
If your item is returned to us between 29 and 90 days from delivery we will charge a restocking fee of 25% of the price you paid for the item initially. This will be deducted from the value of the exchange or credit note which is issued to you. This is because  technology in the AV marketplace moves fast, and as a result the value of items decrease very quickly.

Please note we do not accept returns after 90 days, except for repairs under warranty.

To complete your order please call us on 0800 634 4484
9am to 6pm Mon-Fri, 9am to 5.30pm Sat.

Thank you!