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Sennheiser In-Ear Sound Isolating Headphones (MM 55i) - Black

  • Model Number: MM 55i
  • WebID: 10225921
(90 ratings)

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Sennheiser MM 55i in-ear headphones combine a stylish design with the audio technology that only Sennheiser can produce. In addition to impressive dynamic range and bass output, the ear-canal blocks external noise to further underscore each detail of your music. It also features a built-in mic that lets you take calls or chat on your iPhone, iPad, or iPod touch.

More Information

  • Smart in-line remote with microphone
  • Enhanced usability for the latest models of iPod, iPhone and iPad
  • Superior dynamic range and bass response for first class stereo sound
  • Ear-canal design blocks external environmental noise for effective passive attenuation of ambient noise
  • Storage pouch included
  • Comfortable custom fit

What's in the Box

  • 3 Pairs Ear Sleeves (S/M/L)
  • Storage Pouch
  • Manual

Manufacturer's Warranty

  • Parts - 2 Year(s)
  • Labour -

For more information about the Manufacturer’s Warranty, please contact the manufacturer or visit their website.

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Headphone Style In-Ear/Ear Bud
Band Style None
Sports & Fitness Ear Clip No
Sound Isolating Yes
Noise Cancelling No
Wireless No
Bluetooth No
Effective Wireless Range Not Applicable
DJ Style No
Professional Grade No
High Fashion Design No
Water/Sweat Resistant No
Inline Volume Control Yes
iPod/iPhone Control Yes
Built-in Mic Yes
Folding No
Celebrity Endorsed No
Cord Length 1.3 m
Plug Material Not Applicable
Plug Size 3.5 mm
Ear Cushion Material None
Frequency Response 80Hz - 21 kHz
Impedance 16 Ohm
Magnet Type Neodymium
Sensitivity 106 dBm
Colour Black
Weight 10 g
What's in the Box
Warranty Parts 2 Year(s)

53 Customer Reviews for Sennheiser In-Ear Sound Isolating Headphones (MM 55i) - Black

Average Overall rating

3.3 / 5
Based on 90 ratings
  • 5 Stars
  • 4 Stars
  • 3 Stars
  • 2 Stars
  • 1 Star

Positive vs. Critical Reviews

62% Positive

56 Reviews

37% Critical

34 Reviews

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  • from Toronto, ON
  • Jun 19, 2013

Just awful

These babies died in a month. The earpieces never really fit properly. The sound was, well, 'okay'.

  • from Ottawa, ON
  • 49 minutes ago


Great sound!! Fit in ear very well if you use the correct size (comes with 3 different size buds). Basses are rich and warm, great mids, not tinny on the treble. Best headphones out there for the price. Uneven cords make it easy to sting one around your neck and keep cords out of the way; cords are quality material, as are all componants of the headphones. Had mine for almost 2 years, used daily, still in perfect condition!

  • from Vancouver, BC
  • Apr 14, 2013

Great for the price

I'm very satisfied with my pair of MM55i's. For those that are having problems with fit, I wonder if they tried using the largest size buds instead of the standard ones. I switched out to the largest ones and they fit very well, just like earplugs. I can barely hear anything outside of my music with these on. I'm used to other run of the mill average in-ear's such as Skullcandy 50/50's. I had a few pair of those before I got these, and the Skullcandys would tend to break after awhile. The bass on the Skullcandys was stronger, but the overall sound quality and clarity is much much higher on the Sennheisers. I would buy another set of these in a heartbeat.

  • from Toronto, ON
  • Mar 14, 2013

Not Bad

I got them as gift from office and I've been using them from 2 months now. I think I'm quite satisfied: Pros: 1. Quite durable - I have used more than 20 different earphones in past 10 years and most of them don't last in scenarios I've used them - worst being: forgetting them in a washing machine! 2. Price - Although I didn't purchase them, I went to the websites to find the price and you can get them in quite reasonable amount. Cons: 1. Sound Quality - It's not bad, but given they are from Sennheiser, I was expecting more. I found my Apple earpods to be better (and cheaper too) than these. 2. The extra functionality like moving through a song or cancelling a call doesn't work via earphones (I use Android Ice cream sandwich).

  • from Toronto, ON
  • Feb 26, 2013

Meh! Only so-so

I'm actually disappointed given that these are Sennheiser. The sound is only average and I find they don't hold in my ears all that well while running.