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Sennheiser MM 550-X TRAVEL - MM550-X

Premium Over-Ear Noise-Canceling Bluetooth Headset

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List price $399.00

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with warranty

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Arrives by Friday, Mar. 6 to zip 98144

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What's In The Box?
  1. Sennheiser MM 550-X TRAVEL Bluetooth headset
  2. BA370 PX Rechargeable Battery
  3. USB Cable
  4. AC Power Plug
  5. U.S., European, U.K., Australian Power Adapters
  6. Audio Adapter Cable (531406)
  7. Sennheiser HH 10 Universal Holder (Mount) Available
  8. Airline Adapter (1x Female 3.5mm to 2x male 3.5mm)
  9. 1/4" Adapter (6.3mm)
  10. Zippered Travel Case
  11. Instruction Manual on CD-ROM
  12. Quick Start Guide
  13. Owners Manual
  14. Authorized 2-Year Warranty

General Features:

  • Wireless Bluetooth Noise Cancelling Over-Ear Headphones
  • Designed with your traveler lifestyle in mind
  • Wireless Bluetooth Technology provides completely cable free enjoyment for truly portable usage
  • NoiseGard 2.0 Noise-Cancelling technology provides up to 90% Active Noise Cancellation
  • SRS WOW HD Delivers Incredible Simulated Surround Sound for 3D like Imagery and added depth
  • Integrated Microphone with adjustable Volume Controls for use with iPhone, Android, Blackberry and Windows Smartphones
  • Adjustable headband for comfortable listening sessions
  • Replaceable Long Life battery allows recharging via USB port or wall adapter
  • DuoFol transducers deliver high-fidelity audio
  • Includes Airplane/Airline Adapter for convenient travel
  • Soft, Luxurious Noise Isolating Ear Pads/Cushions (Model 531404)
  • Primary Color: Black
  • LED Color: Blue
  • Manufacturer Model Number: MM 450-X TRAVEL
  • Manufacturer Part Number: 504515
  • Sennheiser MM TRAVEL Series Bluetooth Noise-Cancelling Headphones Are Available In:
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product Specifications:

  • Speaker Type: Dynamic Driver
  • Magnet Type: Neodymium
  • Frequency Response: 15 Hz - 22,000 Hz
  • Nominal Impedance:
    • Active Mode: 590 Ω
    • Passive Mode: 100 Ω
  • Sensitivity: 107 dB
  • THD (1 kHz): < 0.1%
  • Bluetooth:
    • Version: 2.1 + EDR
    • Range: Up to 33 ft
    • Transmission Frequency: 2.4 GHz
    • Transmission Power: 8 dBm
    • Profiles: HSP, HFP, A2DP, AVRCP
    • Codec: SBC, apt-X
  • Power:
    • Supply: BA 370 PX Rechargeable Battery (BA370 PX)
    • Battery Type: Lithium-Polymer
    • Charge Time: 3 Hours
    • Playback Time:
      • Talk Time with NoiseGard 2.0: Up to 20 Hours
      • Listening Time without NoiseGard 2.0: Up to 10 Hours
      • Listening Time with NoiseGard 2.0: Up to 8 Hours
  • Cable (531406):
    • Detachable: Yes
  • Plug Size: 2.5mm to 3.5mm

Also found as: MM 550X, MM-550X, MM550X, Sennheiser MM 550-X Flight, MM550-X, Sennheiser 504515

Product History:

Sennheiser MM 550-X thumbnail
(newest, current model)
Sennheiser MM 500-X thumbnail
(previous model, replaced by Sennheiser MM 550-X TRAVEL - MM550-X)

Headphone Design

Headphone Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Over the Head
Earpiece Design

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.

This is the lifestyle that the headphones are designed for. Each style has unique features that make it perfect for particular people.

Designed for those that are active. These headphones are made to stay in the ear during workouts. Whether you frequent the gym a lot or go running outside in the fresh air, these active style headphones will be your best friend.

For those that need the best in music quality. These audiophile headphones are engineered to produce high fidelity and accurate audio replication.

Disc Jockeys (DJs) require a special type of headphone that can meet their professional needs. These headphones are durable, loud, and will often allow for one ear listening.

Fashion Enthusiast:
For those that want to make a fashion statement with their headphones. Not only are these headphones designed with great sound quality in mind, but also great looks!

This lifestyle speaks for itself! If you love video games and want a pair of headphones that will deliver explosive sound and allow you to communicate with others, this is where you need to shop!

Music Lover:
These headphones are made to sound great. They are designed to produce rich, brilliant sounds that will play your music in a manner that the artists would appreciate. These headphones are for those that love music.

Musical Production / Recording Artists:
You're a music creator. Whether you're producing and mixing it down or in the studio recording yourself, you need a pair of headphones that will reproduce the music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Headphones need to be affordable and durable to keep up with the student lifestyle. A variety of styles can be considered a pair of student headphones.

Those that often find themselves on planes or on the road a lot. These headphones are compact, lightweight, and have a portable design. Some of the headphones in this lifestyle will feature noise cancellation technology that will help shut out outside noise.

Music Lover
Acoustic Principle
The basic design of the headphones. There are 3 different types: Open: Have ports that allow air through the back of the diaphragms, enabling the headphones to sound like the music is coming from an outside source. Closed: Completely sealed and have no air passing through the diaphragms. Sounds like you are in a closed off room. Semi-open: Have slots or ports in the back of the cup and are partially open. This allows for a mixed sound between an open and closed headphone.

General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

1/4" Stereo Jack Adapter
Some headphones will come with a 1/4" stereo jack adapter to connect the usual 3.5mm jack to a 1/4" stereo plug.

1/4" Stereo jack is a larger audio jack that select electronics have.

Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
15 - 22,000 Hz
Driver Type
The physical design of the driver in the headphones.
The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
16 ohms
Primary Color
This is the main color of the item.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Walker La

Great cans

September 30, 2014

Very good sounding cans. Taking a plane ride this weekend want to see how the noise canceling works. Tried them on noise canceling on my mower, 32hp deisel zero turn. Helped some. I think I was asking to much of them.
As ben stated before the volume is a litte low. iPhone 5 will drive them.
The base is clean as is the highs.
I would not hesate to recommend to a Frend.

7 of 11 found this helpful

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More than expected

September 27, 2014

1. Customer Service: starting from the very beginning, there had been some doubt about this website- not well known to me and my friends. I called their 877 number. A gentleman helped me made my decision: he is straight forward, honest, and willing to do something to give me a deal.
2. shipping: delivered as promised - Friday, so i did have the weekend to enjoy this big buck purchase.
3. personal feeling to this headphone: crisp clear voice, gives a new level of experience to audio. It feels like i can carry my home 5.1 audio system with me all the time, on the bus, in the backyard, and at work.
4. speaking of work, i sit in front of desk 5 days/week, 9 hours/day. This one does help go through the boring workload. By the end of the day, my ear drums are still ok - not like other ones I have, they made me feel so tired. The downside is that, the battery. I wish I bought a spare together with it. Now, I had to pay international shipping again to get it from this website.
5. had a couple friends who work in recording business and as musician. they say this is a true piece of reward to the ears.
6.noise concelling is not supper: low frequncy part is ok, not on the human voice. to me, this is good enough.
Over all, happy with the product and the service from here. plan to buy another one as Christmas gift for my wife- such a beatiful thing, she deserves it.

4 of 11 found this helpful

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Browse 1 question and 2 answers
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Why did you choose this?
Sonic Electronix Store
combination of highest quality sound and features. By far lightest weight of the high end headphones.
Timothy S on Nov 7, 2014
Sennheiser makes a good set of cans.This is my 2nd pair.
I bought these for over the ear, noise cansulation feature and bluetooth.
I have a diesel lawn mower and tractor and want to see if they will counteract the noise level. A LOT TO ASK FOR!!
Wayne L on Aug 16, 2014

Product Summary


Model Number

MM 550-X





Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Sennheiser MM 550-X TRAVEL - MM550-X