Hi,
I have the AKG K601, #009839 Made in China. I purchased them new few weeks ago and according to foobar I have 100+ hours of burn-in on them. I'd like to state that these are my first higher end headphones. My previous headphones have been Sennheiser PC-151 and HD-205. So these impressions are from a 24 years old commoners perspective.
What I was looking for in headphones when I was searching for new ones was comfort that would allow me to use them for 6+ hours a day. Long age, I wanted them to last at least 5+ years. Lastly I wanted good soundstage. I live in Europe so the prices here are little bit wonky when compared to US. For example the AKG Q701, which I was initially interested in costs here 450 dollars whereas in US you can get the same headphone around 290 dollars. The K601 was in my price range, it had big comfy velvet ear cups that you could replace and people had reported them having a good soundstage. So I decided to give them ago.
The K601 arrived and initially I was slightly disappointed, though that might not be the correct word for it. I think I was more of a surprised by the fact that everything sounded so clear, detailed and open. Which was something that I wasn't used to. But it didn't take me long before I fell in love with the new sound. My classical tracks sounded absolutely amazing with these headphones! During the first day or two I was compelled to listen all my classical songs from my hard drive. They sounded that good. The next thing I noticed was that bad quality recordings sounded really bad. A thing that I had not noticed before with my old headphones. They sounded absolutely fine with my HD205s, but with the detail/clarity of K601, it was revealing all the flaws in the tracks. This made me delete considerable amount of songs from my hard drive. Another thing to note is Youtube videos, there are lots of videos there that will sound so bad. You can still find music videos in youtube that sound good, but it takes little bit more time to search them now. Before it didn't matter what I picked, because no matter what I had selected from youtube it sounded ok.
Ear cups in the K601 are big and spacious with lots of room for my ears and they are made of velvet which makes the K601 really comfortable to use. The headband is made of leather and isn't padded, but I haven't had any problems with it after long listening sessions. Also I really like the self adjusting headband. Overall the comfort is excellent and build quality is really good too.
I try to describe the sound characteristics with few words, but keep in mind I don't have experience from other high end headphones.
Bass:
It's adequate. It goes low and is pretty tight. Having more of it would make some songs sound bad for my taste. This being said it's definitely not enough for those bass heads who enjoy listening to techo, dubstep etc.
Mids:
Vocals and piano sound amazing. I think it helps that the bass isn't booming and trying to overshadow these strong mids.
Highs:
These are clear and detailed. Maybe little bit too bright/clear on some songs for me.
Soundstage:
This is one of the biggest changes I noticed right away. The soundstage is so big, a massive upgrade from my old headphones.
Overall I'm really enjoying these headphones and I will probably use them till they break. They are super comfortable, you can replace the ear cups and they sound amazing on most types of music, with the exception being bass heavy genres like techno and dubstep.
Somewhat relevant strory: My mother was visiting me and I told her to test my new headphones. I put Antonio Vivaldi's Summer Presto playing and went to go to toilet myself. When I came back she was all teary eyed, maybe it brought her some memories from the past, I don't know but she was clearly moved. I then told her to listen to the same track with my old headphones and she was in awe. She said and I quote 'I can't believe the difference! the new ones sound so much better. I was under the impression that headphones are just headphones and you are mostly paying for the design and brand.' She then listened at least an hour different classical tracks with a big smile on her face.
Edited by Papander - 4/4/12 at 5:19am