Reference Quality Over-Ear Headphones.

Features - AH-MM400

​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

Downloads - AH-MM400

pdf file
AH-MM400 Owner's Manual

1,66 MB

pdf file
Product Information AH-MM400

3.25 MB



'a great set of classy-sounding portable headphones'

The AH-MM400 emerged as the test winner because of its "haptic and high quality sound". The mids and highs sounded the clearest of all test candidates." Pretty design, first-class workmanship and a fine sound. You cannot expect any more from headphones.

Denon AH-MM400 is an exclusive headset for those who like good sound and products with high build quality and exclusive materials. Denon AH-MM400 delivers a solid impression and we respond by giving Denon AH-MM400 our top marks.

The DENON AH-MM400 impressed the jury not only by its sound, but also visually. Thanks to the "high level of comfort, the compact dimensions and the natural sound reproduction" it received the award "Outstanding".


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