“I don't have any headphones to compare them to, as these are some of my first good quality headphones. They sound great, they're pretty comfortable, if you wear them around the house, or just walking around, they stay nicely in your ear, however if you do something that makes you sweat, they don't stay in your ear well. I'm guessing this can be fixed with custom tips, but I never bought any....” --RyanDN
“This is sort of a mini review. Overall the sound and build quality are pretty okay. I like the smooth and balanced sound signature these in-ears have. The soundstage isn't too wide or high but it's acceptable. There is sibilance on high notes but with lower volumes it's okay. Bass is not overly powerful but still leaves impact and the mids and trebles are smooth and clear. I...” --Slashfury99
“The build quality of these earphones are perfect: from the very first time you hold a pair of these in your hands you know that they won't fall apart any time soon. But this build quality leads to some issues: the housing is pretty heavy and this can make the use of these clip-on styled headphones pretty uncomfortable for some people. Noise canceling isn't really good but keep in mind that this...” --Maniello
For over 17 years we’ve been crafting the world’s finest custom in-ear monitors for discerning music listeners and industry pros. Traditionally, the “custom” in “custom in-ear monitors” refers to personally molded shells that fit you and only you. However, with the UE Personal Reference Monitors we’re taking customization to a whole new level. As the...
“ Quite nice if you like/need bass. Lots of it. This phone is a weird construction that falls somewhat short of what it could be. If only UE had refined the bass performance, done something about the highs and added some midrange. At any rate, theres bass aplenty if that is what you are looking for. Bass extends deep and punches hard. I often find myself EQing the bass down and...” --Hakone
“ Ultimate ears metro.fi range are often overlooked on these forums. There is a simple reason for this, they are not worth the price they quite often retail at. They are, however, frequently on special offers and very good deals, i've even seen them being given away with other things costing only about £50. Obviously when earphones are on special offer they should be compared to others in their...” --Marcus_C
“Anyone aspiring to be an audiophile would have heard the name of these IEMs, they are one of the very best around and only a few are in the same league as this one. The IE80 was released a few years ago, following the IE8 which was for a long time, the best that Sennheiser had to offer in this regard. Lets cut the introduction short. This review is not an Audiophile perspective. Its just my...” --jnxr
“After reading glowing reviews of both of these in ear monitors I was still unable to decide which one would be right for me so I bought both, first the Shure and a few weeks later the Sennheiser. I already own the JH Audio 16 Pro, Ultimate Ears Triple.fi 10 Pro, HiFi Man HE-500, Sennheiser HD 650, Shure SRH940 among others. My music files are all in FLAC format and I play them through an...” --Art inTampa
The Sennheiser MX 660 earbuds are high quality earphones with Sennheiser's innovative "Basswind" system for superior, bass-driven stereo sound experience. They are ideal for use with all MP3, CD, DVD players and portable gaming systems as well as feature a volume control integrated in the cable and a cable winder for convenient cable length adjustment.