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Sennheiser MM 500-X

Premium Over-Ear Wireless Bluetooth Headphones Stereo Headset with Invisible Microphone (MM500-X)

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This item has been discontinued

But you may be interested in the newest model that's available.

mm550x thumbnail

Sennheiser MM 550-X TRAVEL - MM550-X

OUR PRICE: $289.00

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Audiophile, Premium, Best In-Class, Sennheiser

The award winning Sennheiser MM 500-X over-ear Bluetooth headphones offer you the best of both worlds: the freedom of wireless Bluetooth music and the high quality sound that Sennheiser is known for. These premium over-ear headphones don't skimp on the internals. Utilizing the latest aptX technology, an advanced audio circuit to deliver true high-fidelity sound over Bluetooth, the MM 500-X headphones don't disappoint. Sennheiser's patented Duofol™ diaphragms provide you with incredibly detailed, crystal clear sound. To go along with the convenience of Bluetooth and awesome Sennheiser sound, the MM 500-X's were carefully engineered to provide you with the ultimate in comfort during even the longest listening sessions. Premium soft padded headphone cushions and an adjustable headband ensure these headphones allow nearly any user to wear these headphones discomfort-free for hours on end.

Enjoy Bluetooth Freedom with the Sennheiser MM 500-X HeadphonesBluetooth Freedom

No matter how carefully you wrap and store cables, they somehow find a way to get tangled up. Headphone cables are no different, and the MM 500-X headphones were designed with Bluetooth to give you that wireless freedom. Combined with the built-in microphone, these headphones are perfect for getting lost in your music and managing your calls without getting ever tangled up in that mess of wires again.

Integrated Controls for Easy UseOn-Board Controls

When you're in a groove the last thing you want to do is pull out your phone to adjust the volume or skip a track. These headphones have eliminated that inconvenience by integrating volume, track and phone call controls into the right earcup to give you total direct control of your device. You'll never have dig your phone out of your pocket, purse or backpack to control your music or answer a call again.

Collapsible Headphones for Easy PortabilityPortability

Let's face it, as much as we would all like to never take off our headphones, there comes a time where we just have to. While the MM 500-X's are best served being listened to, Sennheiser engineered them with collapsing hinges with those non-use times in mind as well. When collapsed, these headphones are incredibly compact, making them both easy to transport and store.

We can't imagine that another set of headphones offers this much sound quality and convenience for anywhere near this price, making these the best all-around, reasonably priced set of headphones we have heard yet.

- Oliver Amnuayphol,

General Features

  • Over-Ear Wireless Bluetooth Headphones
  • Computer optimized magnet systems minimize harmonic and intermodulation distortion
  • Connect wirelessly to any Bluetooth enabled devices for CD Like Quality with apt-X
  • Hi-fi technology and an invisible microphone deliver superb stereo sound and clear conversations
  • Easy headset controls in one intuitive cluster for simple switching between calls and music
  • Luxurious Isolating Earpads provide additional silence, while offering Platinum 5 Star comfort
  • Neodymium ferrous magnet systems ensure optimum sensitivity and an excellent dynamic response
  • Exceptionally natural, spatial and accurate sound
  • Direct cable option for use on airplanes, with an airline adapter included
  • Foldable Easy-2-GO design minimizes the space needed to securely store these headphones safely in the provided travel case
  • Rechargeable Lithium Battery for long lasting continuous usage, and can be purchased additionally for longer trips Sennheiser BA 370 PX Battery (535105)
  • Sennheiser HH 10 Universal Holder (Mount) Available
  • Primary Color Tone: Black
  • Secondary Color Accent(s): Silver, Brushed Aluminum, Blue
  • Manufacturer Part Number: 502888
  • Authorized Sennheiser Internet Retailer
  • 2-year Manufacturer's warranty

Product Specifications:

  • Supported Profiles:
    • Bluetooth: Version 2.1 + EDR
    • Transmission Frequency: 2.4 GHs
    • Transmission Power: 8 dBm
    • Advanced Audio Distribution Profile (A2DP)
    • Audio/Video Remote Control Profile (AVRCP)
    • Headset Profile (HSP)
    • Hands-Free Profile (HFP)
    • Codec: SBC, atp-X
  • Headphones:
    • Transducer Type: Closed, Dynamic Driver
    • Ear Coupling: Circumaural
    • Nominal Impedance:
      • Active: 590 Ohms
      • Passive 100 Ojms
      • Total Harmonic Distortion (THD): 0.1 %
      • Frequency response (headphones): 15 Hz - 22,000 Hz
      • Sound Pressure Level (SPL): 107 dB
    • Microphone:
      • Built-In: Yes, Discreet Profile (Invisible)
      • Pick-Up Pattern: Omni-Directional
      • Frequency Response: 100 Hz - 10,000 Hz
    • Battery:
      • Type: Lithium-Polymer, Rechargeable
      • Specs: 3.4 Volts; 250 mAH
      • Model: BA 370 PX
      • Talk time: 20 hours
      • Listening time: 10 hours
      • Charging time: 3 hours
    • Cable length: 60 Inches (1.4 m)
    • Weight: 6.31 Ounces (179 Grams)

    What's in the Box?

    1. Sennheiser MM 500-X Headphones
    2. Protective Storage Case
    3. USB Wall Charger
    4. Wall Adapters for US, EU, UK and AU
    5. Airplane Adapter
    6. 6.3mm Adapter
    7. Audio Cable
    8. USB-to-Micro USB Cable
    9. User Guide

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.

Around the Ear
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.
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
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
107 dB
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.
100 ohms
Primary Color
This is the main color of the item.
Secondary Color
A color that compliments the main color of the product.

Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating

Browse 1 question and 2 answers
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Why did you choose this?
Sonic Electronix Store
light weight and top reviewed best audiophile bluetooth quality for the money
Neil W B on Nov 8, 2014
Sennheiser is good quality; I wanted over-the-ear Bluetooth; it has a replaceable battery.
Caitlin H on Oct 28, 2014

Product Summary


Model Number

MM 500-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 500-X