Headphone Reviews and Discussion - Head-Fi.org
Hawaiibadboy
Hawaiibadboy
Dollar to performance ratio of Superlux is off the chart.
LOVE this company. Glad you are giving some reviews of these gems!
Soundsgoodtome
Soundsgoodtome
Nice to see my review years ago wasn't based on crazy or 'young ears'. Lol

Great review -- my only complaint for these phones at this price really would've been nicer pads. Something that can be easily remedied.
abm0
abm0
bhazard
bhazard
This review sums up the Audio Hall of Fame status of these Superlux sets. These were the original value monsters. I hope Superlux comes out with even better new product in the future, as it is harder to find budget value headphones compared to earphones.
Bansaku
Bansaku
Great review! My curiosity is one step closer to pulling the trigger on these!
xxAMAROKxx
xxAMAROKxx
There are TWO THINGS, that makes HD-668 B unusable for listening music:
1. HEIGHTS are too strong. VERY STRONG. No change to mitigate it through equalizer (for example, most of music with high hat are unlistenable).
2. Soundstage is enormously wide. So wide, that you cant concentrate to the music itself. Frequent dizziness is not exceptional.
 
I Had these headphones for couple of weeks and then I had to sell them. It is for analytical listenning of keyboard or guitar but not for music. 
 
(I am not a fan of modding, but I tried to do something with them - without much success)
abm0
abm0
@xxAMAROKxx
Soundstage seems to be very personal with these (or maybe in general) - I can't hear the sound as coming from outside of them and there's another review on here that said the same thing: sound is confined to the physical perimeter of the headphones. As for the highs, yes, after burn-in they get generally over-expressed and need some kind of taming to not be fatiguing. Some people just add thin layers of porous paper ripped from 2-ply or 3-ply paper towels or something like that under the earpads (over the drivers) until they sound good. But please note that if you haven't burned them in they may be harsh and unbearable due to some 5-6-7 kHz spike rather than overall brightness, and it's not the same thing. If it's that, it would explain why you can't solve the problem with just any equalizer. Regardless, that kind of sound signature should change in time. Burn them in for 100 hours with frequency sweeps first, then reassess.
xxAMAROKxx
xxAMAROKxx
Pastapipo
Pastapipo
Great extensive review! Hats off!
Baycode
Baycode
Great review Alex, congrats! :)
audiophilefan
audiophilefan
Thanks for the very detailed and clear review. :) By any chance, are you able to compare this with the HD-330? Honestly, I'll also tag the HD-330 as a "giant killer", even more so than any budget pair I've tried so far. 
Soundsgoodtome
Soundsgoodtome
@xxAMAROKxx -- wow tissue mod, who'd have ever thought it.
xxAMAROKxx
xxAMAROKxx
xxAMAROKxx
jon parker
jon parker
These are brilliant for gaming !
Trevayne10
Trevayne10
Not directed at anyone in particular, but just what the heck is headphone "burn-in" supposed to be, anyway?  It seems to me that you "burn-in" headphones just by using them.  Not a believer.  Never heard anything so ridonculous in my life!  "Burn-in", indeed.
abm0
abm0
@Trevayne10
You're loosening up some of the materials involved in the mechanical movement of the membrane during sound reproduction. It doesn't matter if it's music or not, just that there's a lot of movement done at all frequencies. Some people like to compress that into pure burn-in sessions with artificial full-spectrum sounds so that initial phase doesn't take as long to produce its results as it would if it were based on simple listening.
jon parker
jon parker
@Trevayne10 Exactly - YOU have never heard anything. Which is 0% valid argument to 'prove' it does not exsist :) Many many people here on Head-fi, [I think its fair to say the largest collection of semi - pro listeners] including myself have experienced from small to large differences in sound characteristics with various headphones, starting from 10 to 350 hours. Changes tend to be most evident in the low end but harsh treble 'out of the box' can often soften over time. Over all the whole range of frequencies can be heard to smooth and balance out - like trimming and tidying up and balancing a wild forest! 
Its rare to witness a 'huge' change but if the listener has a degree of subtlety and an experienced ear small to occasionally big improvements are very evident overtime.  
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