Sennheiser MM 450-X

Noise-canceling Bluetooth® wireless headset with aptX® high-fidelity wireless audio capability

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  • Sennheiser MM 450-X


  • Sennheiser MM 450-X

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Item# 143MM5450X

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Our take on the Sennheiser MM 450-X

by Dave Bar

The travel headset you've been waiting for

Built with the world traveler in mind, Sennheiser's MM 450-X lightweight, portable headphones give you superb stereo sound, wireless convenience, and relief from the din around you. Now you can listen to your music in peace, manage phone calls, or chat with a seatmate, all without ever taking off your headphones.

Sennheiser's active noise-canceling circuitry quiets outside sounds, while Bluetooth technology lets you make hassle-free wireless connections to compatible devices, such as many cell phones, laptop computers, tablets, and MP3 players. Integrated volume, track skip, and call answer/end buttons built into the earcup provide convenient operation while your phone or music player remains safely in your pocket, purse, or backpack. Plus, the MM 450-X headphones support the latest aptX technology — a sophisticated audio circuit that delivers true high-fidelity stereo sound wirelessly over Bluetooth with aptX-enabled sources.

Noise-canceling technology gives you peace and quiet

Sennheiser's NoiseGard™ 2.0 technology reduces extraneous sounds by up to 90%, such as engine roar, wind noise, and the conversation of surrounding passengers. Tiny microphones in the headphones pick up the sounds of your environment. Advanced circuitry then creates a signal that "cancels out" much of this external noise without affecting your music or phone calls. A handy "TalkThrough" function lets you temporarily override the noise-canceling circuit with the push of a button to carry on a conversation with a seatmate or give your drink order to the flight attendant.

Exceptional comfort, sound quality, and convenience

The MM 450-X's soft earcups feature plush leatherette cushions that feel great. An adjustable padded headband ensures comfortable listening for hours on end, making these 'phones ideal for long trips. Plus, they fold up into a compact package to fit inside the included carry pouch for easy transport. Sennheiser's patented Duofol™ diaphragms deliver detailed, crystal clear sound. And just in case you need it, Sennheiser includes a cable plus an airline adapter for a direct wired connection in situations where Bluetooth is not permitted, or you want to make use of in-seat entertainment and other wired sound sources.


  • portable, folding, on-the-ear design
  • padded, closed earcups and adjustable headband
  • Bluetooth® wireless operation with advanced aptX audio circuitry for streaming high-quality stereo sound from aptX-enabled devices
  • built-in microphone and wireless earcup controls for hands-free conversations using compatible Bluetooth cell phones
  • NoiseGard 2.0 noise-cancellation technology provides up to 90% active noise cancellation
  • TalkThrough function — lets you pause the noise-canceling for brief conversations
  • advanced DuoFol™ drivers for detailed sound and extended frequency response
  • rechargeable lithium-polymer battery included
  • single battery charge gives you:
    • up to 20 hours talk time without NoiseGard
    • up to 10 hours listening time without NoiseGard
    • up to 8 hours listening time with NoiseGard
  • advanced Duofol™ drivers with neodymium magnets
  • integrated controls on the right earcup include track, volume, and answer/end call functions
  • frequency response 15-22,000 Hz
  • 60" detachable audio cable with stereo mini plug
  • airline adapter, full-size headphone adapter, 48" USB charging cable, multi-country wall charging adapter, and carrying case included
  • weight: 3.7 oz.
  • warranty: 2 years
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Fit Style
Earcup Type
Frequency Response
15-22k Hz
107 dB
100/590act Ohms
3.7 ounces
Cord Length
Airline Adapter Included
iPod Control
Volume Control
Built-in Microphone
Parts Warranty
2 Years
Labor Warranty
2 Years
Product Research
What's in the box?

Download owner's manual

  • MM 450-X Wireless headphones
  • BA 370 PX Lithium-Polymer rechargeable battery pack (installed)
  • Wall charging power supply
  • US power plug adapter
  • EU power plug adapter
  • UK power plug adapter
  • AU power plug adapter
  • 3.5mm-to-1/4" adapter
  • Airline adapter (single female 3.5mm-to-dual male 3.5mm)
  • 50" USB charging cable (Type A USB on one end and proprietary USB on the other end)
  • 5' Audio cable (male 3.5mm miniplug on one end and male 2.5mm sub-miniplug on the other end)
  • Zippered storage pouch
  • Instruction Manual on CD-ROM
  • Quick Guide
  • Safety Guide
  • Compliance statement
  • "Replacement of the Mains Unit" sheet

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.


Overview: The Sennheiser MM 450-X headphones are an accessory that allows you to enjoy your digital music files on your mobile phone or portable music device, including those equipped with Bluetooth technology. The MM 450-X can be used wirelessly, or in places where Bluetooth isn't available, you can plug them in and use them as wired headphones.

Bluetooth Wireless Reception/Transmission: The MM 450-X features Bluetooth v2.1 wireless reception and transmission with a built-in microphone for cable-free use with select Bluetooth enabled phones and audio devices. Supported Bluetooth profiles include A2DP (Advanced Audio Distribution Profile), AVRCP (Audio/Video Remote Control Profile), HSP (HeadSet Profile), and HFP (Hands-Free Profile). The MM 450-X saves the connection profiles of the last eight devices with which it was paired; when turned on it automatically tries to connect with one of those devices.

Note: Not all Bluetooth enabled audio devices will be compatible.

apt-X: The MM 450-X headphones are equipped with apt-X, an audio coding technology that works within Bluetooth to wirelessly deliver CD-quality audio from your portable music device to the headphones. With apt-X, you can listen to your digital music files in crisp, pure, and full stereo sound. The following 3rd party devices / configurations have built-in apt-X support (as of 7/18/2012):

  • Apple Mac OS X Snow Leopard and Lion Operating Systems
  • Apple Mac Mini (latest generation with latest OS update)
  • Apple Macbook Air (latest generation with latest OS update)
  • Apple Macbook (latest generation with latest OS update)
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NoiseGard 2.0 Noise Cancellation: NoiseGard technology is an active noise compensation system, originally developed for use by pilots. NoiseGard uses tiny microphones to measure ambient noise (up to 1 kHz) near the ears. The phase of the noise is then inverted (180° out of phase) and added to the original noise, reducing background noise by up to 23 dB (90%). NoiseGard can be used with Bluetooth wireless reception or when the MM 450-Xs are wired; NoiseGard can also be turned off when not needed.

TalkThrough: The TalkThrough function allows you to have a conversation with the person next to you without taking the headphones off. When TalkThrough is activated, microphones mounted on the outside of the headphones pick up sound in the immediate vicinity and background noise is filtered out (the music is also turned off).

Controls: On the right ear-cup there are integrated controls for your connected phone or audio device. Audio controls include volume, skip forward or backward, fast forward or rewind within a song, play, and stop. Phone controls include volume, accept call, reject call, end call, redial, voice dial, and mute.

Note: All control functions must also be supported by the connected device.

Battery Pack: The MM 450-X has a removable BA 370 PX Lithium-Polymer battery pack (3.7 volts DC/1 Wh) which provides up to eight hours playback using Bluetooth reception and NoiseGard, up to ten hours playback using Bluetooth without NoiseGard, and up to 20 hours using just NoiseGard (with Bluetooth turned off). A power supply with US, UK, European, and Australian plug adapters is included to charge the battery pack; charging time is approximately three hours. The headphones can also be charged using a computer's USB port.

Collapsible Design: These headphones feature a collapsible design with metal-reinforced headband to ensure portability and durability.

Cord & Adapter: The MM 450-X will also work as wired headphones, useful when Bluetooth connection is not an option. The headphones come with a 56" mini-jack cable terminated by a 3.5mm connector for a wired connection. A 3.5mm to full size 1/4" adapter and an in-flight audio adapter (dual mono 3.5mm) are included for added convenience.

Carrying Case: A nylon carrying case is included to protect the headphones during storage or transport.

Specifications: The MM 450-X has the following specs:

  • Frequency Response: 15-22kHz
  • Nominal Impedance: 590 Ω active mode; 100 Ω passive
  • SPL (1 kHz/1 Volt): 107 dB
  • THD (1 kHz): < 0.1%
  • Connectors: 3.5mm, 1/4" adapter, 3.5mm double mono plug in-flight adapter
  • Weight: 3.7 ounces (105 grams)
  • Bluetooth:
    • Version: 2.1 + EDR
    • Range: up to 33' (10 meters)
    • Transmission Frequency: 2.4 GHz
    • Transmission Power: 8 dBm
    • Profiles: HSP, HFP, A2DP, AVRCP
    • Codec: SBC, apt-X
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Sennheiser MM 450-X Reviews

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4 out of 5

Sennheiser MM 450-X

Written By Redhead, Foster City, CA on Saturday, December 28, 2013
Crutchfield Customer Review (What's this?)
Very happy with my new on ear headset.
Light, attractive, good sound, love the wireless feature & does pretty well at sound canceling everywhere except the gym, but that wld be extremely hard to do.
Only thing that really bugs me is the snap/tab that houses the battery is flimsy & I hv a hard time getting it to close firmly.
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5 out of 5

Go Anywhere Headphone

Written By Goggles, Minneapolis, MN on Friday, October 26, 2012
Crutchfield Customer Review (What's this?)
These are my top choice of go anywhere headphones. I've found the ideal product for use with my mobile devices. These headphones have outstanding sound quality especially the bass. I enjoy the sound quality of all types of music - rock, jazz, and classical. The noise reduction feature doesn't muffle the sound quality. These are comfortable headphones for long-play audio. I took the advice of a fellow user and bought a backup battery so I'm never without stereo music. I applaud the manufacturer for including bluetooth capability in a compact design.
Terrific sound quality, truly portable, comfortable for long periods of time.
A little pricey.
13 out of 14 people found this helpful
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2 questions already asked

the headphones will work off my bluetooth devices iphone and ipad .... how long is rechargeable battery life and range distance from my device ? [ peter  Jan 09, 2014 ]
2 answers
  • The sennheiser MM 450 X will connect to both Ipods and Ipads. The range is about 30 feet and the battery life is about 10 hours when noise cancellation is off. It is only 3 hours with noise cancellation on. [ KWAKU   Jan 10, 2014 ]
  • Hey, I'm a girl so my ans is I listen w/the headphones for abt 2 or 3 days for an average of 2 to 3 hrs then I just plug it in. As far as distance I can get a cple of rooms away. Hope that helps, but truly think they're terrific. [ Lani   Jan 10, 2014 ]
Does headset beep 3 times to indicate a low battery? [ Lani  Dec 17, 2013 ]
2 answers
  • Yes. As the battery begins to drain to it's lower battery capacity, there is a noticeable three beep sound. I must admit that I though it was quirk in my song, but soon found that it was due to the headphones. No worries about it though. [ Stuck in Alaska   Dec 25, 2013 ]
  • Thanks for your question Lani. It doesn't appear that we have gotten a response from other customers. I check the manual for this product and found the following:When the battery pack is almost flat, the Star LED on the headset flashes red. You hear a short, negative acknowledgement tone. [ Jeff Staff  Dec 19, 2013 ]

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