Per, How do you place the K240 with respect to the K701/DT990 ? The price difference is something like 1 to 3, the photos on the Thomann website make the K240 or the Superlux 687 look like quality products at 60€, or so.
Peter, I've had K240 for years as my "all round" HP.
Comfortable and don't do anything really wrong
Admittedly they're not getting much use these days (headphones for me is sort of seasonal) but for me they are a bargain. I did at some point change the cable to a longer one, pretty close to factory standard just longer, I am not a believer of fancy HP cables
I am however curious about how Superluxes would do the job, not really keen on the term luxury product, my AKG is much better built than any previously used superluxes, perhaps these K240 were made in Austria ?
K240 surely would be more happy on a dedicated amp though,( something I need to try again anytime soon.) Guess 687 don't need an amp.
Not really done a direct compare vs K701 which I use on a dedicated amp only
Clearly the K701 is more open and detailed, I'm sure you can find reviews via google on the "vs" subject.
Each and everytime I listen to HD600/650 and the likes, I am reminded AKG or Beyerdynamic cans, are more to my likings