Fired them up and loved them. Sound is surprisingly deep and clear for ...
928770
Got these as a Christmas present. Fired them up and loved them. Sound is surprisingly deep and clear for such a small package. However... Months I set them up as desktop monitors in a home studio and immediately had issues with signal to the passive box cutting out. No amount of playing with the connector or swapping cables solved the issue... and of course I discovered this more than 90 days after they were delivered. I went for broke and attempted to solder directly to the contacts on the amp module PCB. Literally nothing I could do would get signal from the PCB to the passive box. Very disappointed.
2198772
Great rich sound. Flushed look makes them hardly noticeable.
2123453
These in-ear headphones offer incredible sound for less than $12. Seriously, you can't believe how great they sound. The clarity and definition are fantastic. The sound profile is actually pretty flat, with nothing boosted or enhanced, despite their name. You would never guess that these things are so inexpensive - they are just so good.

Some reviews have mentioned that the rubber inserts are terrible. However, the smallest plugs fit my ears really well; they isolate well, and I get a great deal without discomfort.

My only complaint is the actual shape of the drivers. Because they are larger than average (and, hence, offer superior sound), they press against my ears. Actually, jab is a better description. However, everyone's ears are different, so others might not experience this issue. I can't listen for more than 30 minutes without a break.

I can't give it five stars, but they earn four easily.
3752506
These speakers are replacing some I have had since 1979, I have had the RF-83s for about a month and I am very pleased with them.

The soundstage is deep and the imaging is excellent.
Plus you don't have to sit in a 'sweet spot' to get the good sound.
There are details in the instrument's sound that I have not been able to pick out before.
Initially I was listening to the speakers instead of the music and these speakers are very easy to listen to.
Voices sound natural and the bass is well defined and deep.
The sound of these speakers is rich, full, and very satisfying.

You may see people write that horn tweeters are bright or harsh and cause listening fatigue on other review sites or forums ... all I have to say about that is they have not heard these speakers.

In movies I can hear each sound individually instead of it becoming just a loud undefined crash.  For example in the movie I Robot when Will Smith is in the house that the demo bot tears down there is a scene where the floor falls and all kinds of debris is sliding down along with Smith and the cat.
I never noticed that this was not just a big crashing noise before, but in this busy scene these speakers keep all those sounds organized and you can hear the individual pieces as they slide down and bump into one another.

Not sure what else to say, if you are looking at speakers in this price class these are certainly worth the time to listen to.
1983187
These cans feature a clean, accurate, open sound with astonishingly deep base. The ultra flat response curve may not please those who are accustomed to phones with boosted base or treble response. The HD650 is not suited for use on portable players as they need adequate power to perform. In any case, they are far too revealing for use on anything but uncompressed high quality sources.

I was pleasantly surprised at how comfortable these things are. This compensates for their truly ugly appearance.

All and all I am very pleased with my purchase of these phone. To top it off I got an extremely good price from Amazon affiliate Sonic Sense.
2427861
I was really surprised how good these sounded.  for ear buds they really have an amazing sound!
2242261
These cans sound MUCH better than I was expecting.  Just as clear as my Focals and KEFs, and a nice sparkly top end, with a robust but controlled low end.  Truly enjoyable to listen to.  And the wood finish is beautiful.  The headband is not as easy to adjust or as smooth as some other headphones I own, but still very workable.  Build quality feels solid.  I am using these with a COWON S9 and a Fiio and Topping amps, as well as hooked to my home system, which consists mostly of Marantz and Emotiva equipment.  For the price, you ABSOLUTELY cannot go wrong with these.  Glad I got them.
3569238
Have always loved Klipsch speakers and needed to replace an older pair of Shure earphones.  I tried my friends Bose and they were so basey.  Descided to give these a shot and totally love them.  Very lightweight and comfortable in your ear.  The wire is thin and does not pull on the earbuds.  That is good but does appears to be fairly delicate.  We will see.  Overall the sound quality is so clear throughout the frequencies.  A high level of transparency and depth to the music.
67837
These speakers really do provide some amazing sound clarity. I spent the whole weekend running 12 gauge speaker cable through the walls, under the floor, etc and mounting these guys. I watched the pro bowl last night and was astonished by the clarity of the sound. You can have the sound very quiet and hear every single detail. The surround is well balanced even if, like me, you need to put the surround speakers on the back wall spread apart rather than on the sides.

Make sure you pair these guys with a nice receiver, as you won't want to drag them down with some cheap setup. I happen to be using an Onkyo system - works great.

I will say that I have a very large space - the family room itself isn't too large, but it is an open floor model to the kitchen and a morning room addition. I would not say these speakers 'fill the room' - my space is simply too large - but for the price and with the clarity they provide I feel like I made a good decision. I'm planning on making additions and upgrades to the system over time - such as purchasing towers for the left and right front speakers and moving the satellites up into high front position, and will probably purchase a second woofer to go with this at some point as the space is so large.

Regardless, I feel that I got great value for my money and the speakers provide very high quality sound.
3987872
Don't let the small price tag fool you, these are very crisp and have considerable volume despite their low wattage rating. Get them. Before I was able to replace the front 6x9s with these, I had replaced the rear 6.5s in my mega cab with these and it was as if only the rear worked. The sound is so crisp and clear it makes other speakers sound like incoherent noise.  If you're looking for sound quality and still want considerable volume get these.
272141
I had them at my old job and didn't realize how clear and LOUD there were until I bought them for home and was able to crank these suckers up.  Very pleased..
3621344
I was literally shocked when I paired these up to my phone and pulled up my music player and gave them a listen. I wasn't expecting a whole lot, and there was not a high number of ratings at the time compared to other products, but I thought I'd gamble on these. Winner-winner! Great sound! Tuned just right for my liking. The right mix of frequencies in the design for sure. High fidelity that really pleases. Will buy and have bought again.
856361
These in-ear earphones were given to me as a birthday gift from my lovely girlfriend. I may not have the wallet for "audiophile" equipment but I consider my ears sharp enough to appreciate nuances in sound.

Product used on 80gb iPod classic while i typically use Grado SR-60's as a baseline for frequency response and reference monitoring.

First let me address some hesitations i had before receiving these earphones:

1. the in-ear fit -
i found the apple stock earbuds to fit comfortably and snugly in my ears. i have small ear canals and i was worried that the smallest supplied eartips would be too big for my ears. i use the dual-flanged eartips (smaller than the triple-flanged eartips shown as the product photograph)and they fit like a gem. follow etymotic's suggestion regarding wetting the eartips for easier insertion. the seal created is amazing. i constantly snap my fingers in front of the inserted er6i's shocked by how well they isolate. the supplied foam eartips are very comfortable as well, but they do take a few more seconds to expand into an adequate seal.

2. bass frequency response-
i listen to everything and i mean it. i had to first test these in-ears by listening to "bodysnatchers" off radiohead's in rainbows. i can hear every instrument clearly in the mix. it's balanced. i can hear a nicely rounded and punchy kick drum. the distortion is distorted without clipping. the er6i drivers are powerful and they have not yet rattled when pushed to higher decibels. listen to "punchup at a wedding" and you can hear the thump of the 808 without the honking of the stupid MBTA trains on BU's campus or the sounds of range rovers unnecessarily revving by you. my guilty pleasure is hip-hop. today i heard R. kelly's "step in the name of love" my goodness, my head could not stop nodding. the high end is articulate without overpowering the lows and the mids while the bass is well balanced and powerful. i'm also a bassist and i've used these as in-ear monitors and they accurately represent my bass tones and low end and moderate volumes (there's no need to push them so high because of the superb isolation).

3. cord thickness
they're thinner than standard iPod earbuds but there's no sense of fragility. i wrap them around my iPod and toss them in my jacket. i've read reviews where people have yanked the earbuds by the wire. i have not done this because there is enough room for me to get a firm grip on the earbuds and remove them securely with ease.

4. maintenance
for optimal results keep your ears clean and the eartips cleaner. the er6i's are equipped with 2 replacement filters. i can't comment on the frequency of replacement as my earphones currently sound like gold and have maintained that tonal integrity since they've been plugged into my iPod.

pros: supreme isolation, fantastic frequency response, listening versatility, included accessories

cons: i don't have enough new music to listen to
4492469
I did some research on headphones, looking for the best bang for the buck. But
I also wanted amazing sound, only because I am particularly picky about sound quality. I always
knew about Sennheiser and their audiophile headphones, but never looked into them. So I did some
review searching and found that the HD 518 headphones were very exceptional in terms of comfort and sound capability.
So I recently bought them and boy have they changed my outlook on headphones. They have such great open
clarity to them when the music is playing. They were a little cloudy a first, but after a few
hours of "burn in", they sounded phenomenal. They have such a dynamic range, both lows and highs
are covered without distortion, and you can actually hear recording mistakes in your music at times. People
say the bass was not that great or sufficient, but if you have a great pre-amp or hi-fi stereo eq, you can get as much
bass as you will ever really need, in terms of an audiophile's standpoint. I would recommend these to anyone
who wants to get serious about sound quality for a great price tag. They are also built well, considering the plastic
headband.
598369
A sale price made these attractive. I bought them on the strength of the reviews. The reviews are right. These sound great. Big full sound. Nice controlled bass. Clean powerful sound. The packaging is impressive. Absolutely worth the asking price. This is a gift which would impress. I'd never heard of these before and now I'll never forget them. Good ear tips, solid build.

Now I'm ordering them as gifts. People I expose them to are always impressed with the sound. Just like me, they didn't realize what they were missing. I put a pair of Sony headphones in which I'd always enjoyed and noticed a lack of fullness I had never recognized before.

There is no need to say more. I'm not a self proclaimed audiophile. I enjoy music but I won't pay extraordinary amounts of money on headphones. This price is very reasonable for the quality you receive.
3304119
I had a couple of cheap headphones around plus a couple of really nice earbuds, but I wanted something a little better that didn't leak sound.  First off I ordered these open box and they looked brand new, just no box.  I don't remember the first song I played on them, but thought it was very good.  It is an adult pair, your head isn't going to thump from bass (as it should be).  I then put on something very vocal with a huge soundstage and it pretty much blew my mind.  It was "Church" by Lyle Lovett and it has these voices coming at you from all around and I literally was looking over my shoulder for someone.

They are comfortable and pretty well made.  Don't care so much for the long, coiled cord, but not a deal breaker.  I have a cheap pair of Sonys that actually sound pretty decent even compared to these, they just don't produce the imagery that these do.  I have a couple of Klipsch in ear monitors that sound fantastic, but not really comfortable and its a very different sound.  They are my "on the go" phones (mostly mountain biking).  They sound like the music is being pumped directly into your head (which it pretty much is), these have a very open sound.
3063725
So I got these as a gift from my girlfriend and wow!  They worked right out of the box without the need for any driver installation or problem.  In addition, others have complained that the remote did not function; however, I found that mine works flawlessly (knock on wood) and does everything from open iTunes to skip to the next track.  They look great and sound even better.  People state that their bass is weak, but quite honestly, I just think they sound VERY crisp and clean and get bass when it is needed (albeit not too much), but they fill a room nicely with sound.  Not for parties where you want to blow your guests away with loud sound, but certainly for great dinner parties where you need speakers that are refined and clean sounding.  I would recommend these to anyone.  My GF bought me a used pair for $42 after shipping and they came ready to go without any blemishes or problems.  Phenomenal purchase.