Superlux HD-668 B

Bought them long time ago for mixing/producing. Sounded good, clear, however the comfort was horrid, huge pressure on ears, pain was imminent using these, also, with original pleather pads these were really sweaty thing to use.
Poor build quality as far as cable connector quality comes - cable that runs from headphones to connector went bad after a while, no easy way to fix this other than removing their cable connector assembly completely and resoldering new cable inside the headphones thus making cable permanent.

+cheap
+said to be rather neutral
+rather good sound stage, ie, don’t sound compressed
+extra cables and carrying pouch included(one of the seams disintegrated rather quickly tho)

-poor build quality, cable that goes from headphones to 3.5mm female plug broke down very easily
-hot on ears, gets them sweaty
-very, very tight, not recommended for longer sessions, otherwise ear pain guaranteed, so you might want to put these on some kind of stretcher or something, to easen up their clamping force

I mostly listen to rock from soft to metal, and a little bit of classical music. The sound is very clear, It`s easy to tell the instruments apart. The frequency range is wide and I can hear parts in the songs that I wasn't able to hear with my previous headphones (Marshall Major), along with that when i plug the headphones the the amp and play guitar along to a song i was able to hear both my guitar and the song clearly (They were kind of muffled with the Marshalls).

Of course at this price they have to compensate with something, and that something is build quality and comfort.
Not too say it`s too bad, It`s made of mostly plastic, so not very sturdy. The earpads are a little tough and I can feel a bit of pressure around my ear, but even after long use it doesn't hurt. Also the earpads can be easily replaced with more comfortable ones (There is even an explanation on how to do it in the manual).
The pads at the top are pretty comfortable, but they sometimes get stuck under the the two bows when i put them on, but a little wiggle and its fine, no big deal.

Also in regard to the high Impedance of the drivers, it is still possible to listen through a cellphone for example, but it is noticeably different, especially for the bass, you can hear it struggle.

Overall i would recommend this headphones for home use, and possibly at some point changing the earpads if you will fill it`s necessary

Ok, so first of all, they sound pretty good, and I dont get the sweaty ears with these like I do with the closed speaker models... If only the headband was more confortable, I could wear these all the day...
But I can't. The headband design is utter crap, I guess I just have too big head, because those "self-adjusting" pads will completely move out of the way and those plastic bands will leave deep grooves into the scalp. I'd have to switch their position all the time to get rid of that.
If the headband was better, I'd give them 5 stars for comfort.

First I thought that the semi-open design would eat away the deep bass, but it won't. I've just had some bad experiences with some other cheap open headphones. What the semi-open design actually does, is that after few hours of use, my ears are not sweaty at all!. And they won't block outside sounds, and I can hear stuff like the doorbell, phone ringing and even my tv, when I have the headphones on.

What I really like, is that the cable is detachable, there is the headphone plug right in the headphones... So I can use my own cable with volume control. Also it makes the cable easy to replace, if I accidentally destroy it by running over it with my chair.

I own the Superlux HD-668 B headphones for about one month, and i am really pleased of the whole package that you can buy for that low price.

Sound:

the sound is clear and quite naturally, but bit sharp in high "klick"- and "sshh"-tones. I use the headphones for my bass-amp with backing tracks through the AUX-In, and it works really good. The Superlux got enough deep tones and i can hear every mistake in playing my bass.

Comfort:

The Headphones fit quite good on my ears without pressing too much. Also the two foam blocks at the top don't decrease the comfort while playing or listening, they make some kind of "light" feeling on my head (without sweating or anything else).

Quality:

Everything is crafted well, the headphones seem to be solid and long-living. Even the 1m and 3m-long AUX-cables are high quality.


So all in all, the Superlux HD-668 headphones are definitely enough for my field of application. Only the harsh "shh"-sounds at listening to some bad-quality soundfiles can be disturbing, but you get some really good headphones for a low price.

I've bought these headphones over a year ago so I could silently play keyboards and work on a few sounds on my synthesizer. Back then, I wasn't much of an audiophile and my ears weren't really used to high quality music.
But I guess that's something that most people who consider buying these headphones have in common. If you were really looking for high-end professional equipment, you would spent more than ~30€ for it.
That doesn't mean they're bad headphones, though. I've compared them with the really good Beyerdynamics DT 770 and I didn't really hear a difference. Considering the DT770 costs about five times as much as the HD-668, that's pretty incredible.

Although they sound good, they don't seem to be very sturdy. The plastic parts and the cushion feel rather cheap and I'm not sure if they would survive falling on the ground a few times.

Also note that these are semi-opened head phones. Even at rather small volumes, they are audible for other people or microphones, so I wouldn't recommend using them in public or while you're recording something.

I bought these in 2011, after trying out the ones that my friend bought.

The sound quality is good. It's neutral, with only a slight overemphasis on the high freq. range. It gets better with a decent headphone amp, these headphones are not on their best with basic laptop sound cards (still better than any phones from this price range I have tried out). Bass response is very accurate. Overall, the sound is very clear, instruments can be distinguished from a mix. I use these with a pair of studio monitor speakers to mix recordings at home and I'm very happy.

The comfort is good enough, nothing to complain, but these don't really feel premium. Never tried out longer than three hours, during that period I felt no squeeze.

The quality is not that great. Cheap plastic is all over these headphones, fake leather, ugly seams etc. They came with two cables, both broke up after a year of usage. But with replaceable cables it's not a big deal. If handled with care, these headphones will serve you for a long time.

PS. I also use these while gaming :-)

I bought these headphones to use them as monitoring in my home studio. They are very good value for the price.

Plugged into the headphone out of my amp head (Blackstar HT-5) they push a bit too much the high frequencies. However, plugged into my sound interface (Focusrite saffire pro 14) they sound very balanced.

Overall I am happy with how they sound, plenty of output. The fact you can unplug the jack is a nice feature. At the beginning they felt a bit uncomfortable, the ear pads were a bit too stiff. However, after a couple of weeks of use, they feel much more comfortable. They are also very lightweight which is a bonus.

I would say they are open, rather than semi open. There is lot of sound leakage, but at the same time they also sound very spacious and directional in stereo. So, good fro monitoring, not so good for recording with a microphone.

In terms of build quality, well that's not the good point of this headphones. It is just ok enough, they won't break soonish but they won't last forever. Only the flaps can be adjusted, the earpads are fixed (or at least they look like, seems to require too much brute force to move them).

Pros: decent value, balanced sound, plenty of output, detachable jack
Cons: take some time to get used to have them on, lots of sound leakage.