Sennheiser MM 500-X Wireless Bluetooth Travel Headphones

Outstandingly functional cans with decent sound.
I will grade it in categories on a scale of 1-10:
--Sound quality:
-Wired: 9 (Not Audiophile can killers, but better than most cool cans and slightly better wired than with BT)
-BT 2.1: 9 (best BT audio I have ever heard--and that is not with Apt-X profile. Apt-X, if your device supports it, is as good as advertised. It's indistinguishable from a wired connection. NOTE: While many commenters say the volume is weak, I have not found that to be the case. I can't put them up more than 3/4 volume for 5 seconds without risking hearing damage (both wired and BT). and when I try maxing it out, I can tell you that at loud levels, there is little distortion (wired). I did get this quiet sound once when I tried using the wire with the BT turned on at the same time. If you turn the BT off, it goes back to loud. I think some people (who have the 550-x) are experiencing that phenomenon when they write that they are too quiet.)
--Comfort: 9 (You'll forget they're on, soft...

Great Sound for Bluetooth
I hope this review will help buyers to make a more informed choice. As of this review, there were only two other reviews of this model from which to form my opinion. I have used many bluetooth headphones in the past including earbuds, on the ear, over the ear, and everything in between. I wanted a set of headphones that I also could use as noise reducers,(I work in a noisy environment), so I felt over the ear headphones would be the best choice for me. The Sennheiser MM 500-X has passive noise reduction very much like my over the ear hearing protectors at work and are quite a bit more comfortable.
As for sound reproduction: Most reviewers say that bluetooth devices don't have very good audio as compared to wired headphones, in this case, the audio on this bluetooth device is as good or better than any wired headphones I have ever owned. I am using these headphones with my android phone, and have a good graphic equalizer app installed. This allows me to customize the sound. It...

Impressive overall, but still a few disappointments
Sennheiser got a lot of things right here, but not everything. The core feature, superior BT audio quality with or without Apt-X, is right on the money. Of course it's not serious audiophile grade: there's just a hint of background hiss in the amplified modes -- reminiscent of tape hiss for anyone who remembers that -- and part of the midrange has a reproduction problem that's a little hard to describe, it sounds sort of brittle. It's not always noticeable, but sometimes quite distinct; it just depends on the music.

But even in absolute terms the audio is pretty full and rich and has a great deal of detail: remarkably so for the current bluetooth standard, and strikingly so when Apt-X isn't supported on your source. It's a significant achievement, good enough for properly enjoying music while relaxing, as opposed to "better than nothing for the gym" which is about where other BT headphones sit.

One thing that isn't obvious from the literature is that in...

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