I bought my pair of AKG K340 headphones around 1985. They still look in as-new condition, and have given me a lot of enjoyment over the years, but I really haven't used them must for about the last 20 years.
here's my dilemma. I am just getting back into headphone listening, first with a Xonar Essence STX card driving them from computer (Foobar through WASAPI).
The sound is much as I remember, but here is my feeling on the sound:
*Sound is generally very sweet.
*Incredible clarity in the upper registers. Instruments have bite, yes smooth clarity.
*Can generate excitement (except for rock) at low volumes.
*They are bass-shy.
*Overall tonal balance is a bit "thin"
*Transients seem to have extra treble energy, making them sound too "fast". This leads to fatigue and ear ringing at higher volumes.
On classical music (except for being a bit too low on bass drums), these phones are amazing -- as long as I don't turn the volume up too loud. On some voices, it is wonderful -- on some voices the tonal balance isn't great. Rock can sound okay, but the low bass, and the high-frequencies-on-transient issue makes this not good for anything with a lot of percussion.
There seems to have been a modding community in the past for these. Is it worth it? I also hear that they need to be driven with low-impedance amps (which the STX is not - 10 Ohms) to get proper frequency response.
I am considering selling them, and possibly getting a Sen HD800 -- which is almost my perfect headphone, if it weren't for that darn sibilance!