I bought this item because it looked comfortable, for long recording sessions. I now have 2 pairs, and bought another for a friend. The headphones are very comfortable, but was surprised that the claimed frequency response appears to be or could well be a fact.
I happened to be building a soft synth in Pure Data one evening, and decided to generate some frequencies to find out what I could hear at 59 years of age. I managed to take the frequency to about 17k and could hear it still through the headphones. That's higher than a Shure SM58 captures.
Nobody at the time of writing has commissioned me to test the Superlux to full verification (20KHz?), but it's easily done if you know PD or Max/MSP, simply generate 20K, then put the recording (with a good condenser mic) into a DAW that has pitch transposition, EG Cubase, then drop it an octave, and see if you get a 10K pitch which should be more audible and checkable against a reference. Reprocessing the signal (wav or whatever) down another two octaves would make the sound clearly audible. Alternatively doing an FFT on the original signal gained or using a spectrum analyser should confirm the fundamental frequency as generated by PD.
In a few words, if you only need headphones that work, practicably, without a big pricetag, I haven't yet seen how to beat these. I have a pair of Sennheiser headphones with a better mid-frequency separation, but they tend to hurt ears after a while.
I use them for video editing. playing piano and VST instruments, audio editing and listening to music. I used them for playing an electronic drum kit but for that application I got HD-662.
Pros: - a very clear and and natural sound without bass being too strong - feel "light" on my head and are very comfortable for long hours (even better then HD-662, which also got 5 stars from me) - very good build quality for the price point
Cons: - the low end is not to strong, so this is not a good option if you need a strong bass (e.g. for playing drums - for that application plain HD-681 is better option or closed design HD-662) - it is an open design, so the isolation from outside sounds is very weak, it is actually an issue if you intend to play e-drums in another applications I tried it was not an issue.
* Ceny zawierają podatek VAT. Do ceny artykułu(ów) należy doliczyć koszty wysyłki. Oferty ważne do wyczerpania zapasów. Za błędy w opisie i innego rodzaju pomyłki nie ponosimy odpowiedzialności. CK=Cena katalogowa produktu